(19)
(11)EP 3 254 065 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
06.05.2020 Bulletin 2020/19

(21)Application number: 16747321.4

(22)Date of filing:  05.02.2016
(51)Int. Cl.: 
G01F 1/66  (2006.01)
G01F 1/32  (2006.01)
G01F 1/78  (2006.01)
G01F 1/708  (2006.01)
G01F 1/20  (2006.01)
G01F 5/00  (2006.01)
(86)International application number:
PCT/US2016/016731
(87)International publication number:
WO 2016/127033 (11.08.2016 Gazette  2016/32)

(54)

FLUID FLOW CHARACTERISTICS IN A CHANNELIZING PROCESS FLOWSTREAM, BY INDUCING A STANDING WAVE THEREIN

FLÜSSIGKEITSSTRÖMUNGSEIGENSCHAFTEN IN EINEM KANALISIERUNGSPROZESSMASSENSTROM DURCH INDUZIERUNG EINER STEHENDEN WELLE DARIN

TECHNIQUES PERMETTANT DE DÉTERMINER UNE CARACTÉRISTIQUE D'ÉCOULEMENT DE FLUIDE DANS UN COURANT D'ÉCOULEMENT DE CANALISATION PAR INDUCTION D'UNE ONDE STATIONNAIRE À L'INTÉRIEUR DE CELUI-CI


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 05.02.2015 US 201562112450 P

(43)Date of publication of application:
13.12.2017 Bulletin 2017/50

(60)Divisional application:
20162356.8

(73)Proprietor: Cidra Corporate Services, Inc.
Wallingford, CT 06492 (US)

(72)Inventors:
  • KERSEY, Alan D.
    South Glastonbury, Connecticut 06073 (US)
  • LOOSE, Douglas H.
    Southington, Connecticut 06489 (US)
  • VAN DER SPEK, Alex
    ZN3052 Rotterdam (NL)

(74)Representative: Schmitt-Nilson Schraud Waibel Wohlfrom Patentanwälte Partnerschaft mbB 
Pelkovenstraße 143
80992 München
80992 München (DE)


(56)References cited: : 
US-A- 5 297 426
US-A1- 2011 278 218
US-A1- 2013 284 271
US-A1- 2014 318 225
US-B2- 7 607 361
US-A1- 2006 079 815
US-A1- 2013 199 305
US-A1- 2013 298 635
US-B2- 6 889 562
US-B2- 8 286 466
  
  • Melikhan Tanyeri ET AL: "Microfluidic Wheatstone bridge for rapid sample analysis", Lab on a chip, 21 December 2011 (2011-12-21), page 4181, XP055531215, England DOI: 10.1039/c1lc20604d Retrieved from the Internet: URL:http://www.rsc.org/suppdata/lc/c1/c1lc 20604d/c1lc20604d.pdf [retrieved on 2018-12-06]
  
Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


Description


[0001] This invention relates to a technique for determining at least one fluid flow characteristics in a fluid flowing in a pipe.

[0002] Technique are known in the art for determining fluid flow characteristics of a fluid flowing in a pipe, e.g., using SONAR-based meters developed by the assignee of the present invention and disclosed by way of example in whole or in part in United States Patent Nos. 7,165,464; 7,134,320; 7,363,800; 7,367,240; and 7,343,820.

[0003] US 7 607 361 B2 discloses methods and an apparatus which enable measuring flow of a fluid within a conduit. For example, flowmeters may measure the velocity of production fluid flowing through production pipe of an oil/gas well. The flowmeters rely on detection of pressure variations generated as a result of a backward-facing step as a basis for flow measurement calculations. Pressure sensing occurs away from the step in a direction of the flow of the fluid in an enhanced turbulence region of the flowmeter where the inner diameter remains enlarged as a result of the step.

[0004] US 8 286 466 B2 discloses an apparatus and method for determining the water cut value of a multiphase fluid flowing within a pipe. The device includes a sequestering structure disposed within the pipe, a transmitting device, a receiving device, and a processing device. The sequestering structure at least partially defines a sensing passage within the pipe, which passage has a gap extending substantially normal to a direction of fluid flow within the pipe. The sensing passage is oriented to sequester an amount of a liquid component of the multiphase fluid sufficient to form a continuous liquid body extending across the gap of the sensing passage. The transmitting device is operable to transmit a signal through the liquid across the gap of the sensing passage. The receiving device is operable to receive the signal after it has traversed the liquid within the sensing passage, and create sensor data. The processing device is in communication with at least the receiving device to receive and process the sensor data to determine the water cut value of the liquid.

[0005] US 5 297 426 A discloses a hydrodynamic fluid divider whereby by a shunt line directs a portion of the overall flow of a defined fluid stream through a flow measuring device, such as a Coriolis mass flow meter. The measured flow value for the shunt line flow is utilized along with a scale-up factor to determine the overall flow through the divider. The proportional relationship of the shunt line to the overall flow permits a reduction in the size and operational requirements for the flow measuring device.

[0006] Melikhan Tanyeri et al: "Microfluidic Wheatstone bridge for rapid sample analysis", Lab on a chip, 21 December 2011, page 4181, discloses a microfluidic analogue of the classic Wheatstone bridge circuit for automated, real-time sampling of solutions in a flow-through device format. It is demonstrated precise control of flow rate and flow direction in the "bridge" microchannel using an on-chip membrane valve, which functions as an integrated "variable resistor". It was implemented an automated feedback control mechanism in order to dynamically adjust valve opening, thereby manipulating the pressure drop across the bridge and precisely controlling fluid flow in the bridge channel.

[0007] The invention relates to an apparatus and method according to the independent claims. Embodiments are disclosed in the dependent claims.

[0008] In particular, the invention takes the form of, a method and/or an apparatus, to determine at least one fluid flow characteristic of a fluid flow in a pipe, e.g., including flow rate, mass flow and density.

[0009] The apparatus features at least one signal processor or signal processing module configured at least to:

receive signaling containing information about a fluid flow passing through a pipe that is channelized causing flow variations in the fluid flow; and

determine corresponding signaling containing information about a fluid flow characteristic of the fluid flow that depends on the flow variations caused in the fluid flow channelized, based upon the signaling received.



[0010] The signal processor or processing module may be configured to provide the corresponding signaling, including where the corresponding signaling contains information about the fluid flow characteristic of the fluid flow channelized.

Channelizing Fluid Flow by Using Induced Flow Perturbations



[0011] In summary, by way of example, channelized fluid flow techniques for determining one or more fluid flow characteristics according to the present invention may be based upon using a modulated ultrasonic standing wave that can induce flow perturbations in a fluid flow in a pipe, where induced flow perturbations channelize and cause the flow variations in the fluid flow, as follows:

[0012] In some embodiments, a strong standing wave may be generated upstream in the fluid flow (immediately prior to a SONAR-based flowmeter) by an ultrasonic signal coupled across and reflected back across the flow stream. The 'beating' of these signals creates the standing wave.

[0013] This standing wave acts as a 'comb' and 'channelizes' the flow through the nodes in the standing wave. Frequency modulation of an ultrasonic transducer about the resonant frequency will spatially shift the standing wave at the modulation frequency, e.g., the frequency modulation of the ultrasonic drive results in the 'comb' being swept back and forth across the cross-section of the pipe.

[0014] As the flow is channelized by the standing wave 'comb', the motion of the comb imparts momentum into the flow stream, which is used to induce downstream pressure variation sensed by or through the SONAR-based array.

[0015] According to the invention, the signaling contains information about the fluid flow that is channelized by inducing flow perturbations caused by a modulated standing wave across the pipe that sweeps back and forth across a flow cross-section of the pipe and imparts lateral momentum into a combed fluid flow.

[0016] The signaling may contain information about the modulated standing wave generated by an ultrasonic driver combination arranged in relation to the pipe.

[0017] The signaling may contain information about the modulated standing wave sensed by a SONAR-based sensing module arranged in relation to the pipe upstream from the ultrasonic driver combination.

[0018] The ultrasonic driver combination may include ultrasonic drivers arranged on one side of the pipe and an ultrasonic reflector plate arranged on an opposite side of the pipe.

[0019] The ultrasonic driver combination may include first ultrasonic drivers arranged on one side of the pipe and second ultrasonic drivers arranged on an opposite side of the pipe.

[0020] The signal processor or processing module may be configured as a synchronous SONAR processing module.

[0021] The fluid flow characteristic determined may include mass flow, flow rate or density.

[0022] The signaling received from the SONAR-based sensing module may contain information about oscillating momentum induced in the combed fluid flow through the pipe sensed with segmented PVDF bands that pick up pipe side wall pressure variations on opposite sides of the pipe.

[0023] The signaling received from the SONAR-based sensing module may contain information about the oscillating momentum induced in the combed fluid flow through the pipe sensed with first PVDF bands arranged on one side of the pipe and second PVDF bands arranged on an opposite side of the pipe, the first PVDF bands and the second PVDF bands arranged axially at a predetermined location along the pipe; and the signal processor or processing module may be configured to determine a difference proportional to a modulation frequency of the modulated standing wave caused by the oscillating momentum induced in the combed fluid flow.

[0024] The signaling received from the SONAR-based sensing module may contain information about the oscillating momentum induced in the combed fluid flow through the pipe sensed with corresponding first PVDF bands arranged on one corresponding side of the pipe and corresponding second PVDF bands arranged on a corresponding opposite side of the pipe, the corresponding first PVDF bands and the corresponding second PVDF bands arranged axially at a different predetermined location along the pipe than the first PVDF bands and the second PVDF bands; and the signal processor or processing module may be configured to determine a corresponding difference proportional to the modulation frequency of the modulated standing wave caused by the oscillating momentum induced in the fluid flowing through the pipe.

[0025] The signal processor or processing module may be configured to determine a phase difference proportional to a flow rate based upon the difference and corresponding difference proportional to the modulation frequency of the modulated standing wave caused by the oscillating momentum induced in the combed fluid flow through the pipe.

[0026] The modulated standing wave may have a resonant frequency that is spatially shifted at a modulation frequency so as to act as a "comb" and channelizes the combed fluid flow through nodes in the modulated standing wave.

[0027] The motion of the "comb" may impart the lateral momentum into the fluid flow through the pipe.

[0028] The lateral momentum may be proportional to the mass of the fluid flow through the pipe.

[0029] The lateral momentum may cause pressure variations downstream on a pipe wall that are sensed by segmented PVDF bands arranged on the pipe wall and that are proportional to a total comb-displaced flow mass per unit time.

[0030] The apparatus may include the SONAR-based sensing module and the ultrasonic driver combination.

[0031] Channelizing Fluid Flow by Using Bifurcated Bridge In summary, and by way of further example not covered by the claims and not part of the invention, channelized fluid flow techniques for determining one or more fluid flow characteristics may also be based upon using a bifurcated bridge approach, where bridging paths channelize and cause the flow variations in the fluid flow, as follows:
According to such "bifurcated bridge" configuration, the apparatus may include one or more of the following features:
The signaling may contain information about the fluid flow that is channelized by bifurcating the fluid flow through a bridge having two pipe paths/channels fluidically coupled by a balance flow meter as a bifurcated fluid flow.

[0032] The two pipe paths/channels may include a first pipe path/channel having a first path/channel element with a first flow resistance and a second path/channel element with a second flow resistance, and a second pipe path/channel having a corresponding first path/channel element with a corresponding first flow resistance and a corresponding second path/channel element with a corresponding second flow resistance.

[0033] The first flow resistance may be strongly dependent of a flow rate of the bifurcated fluid flow in a first fluid path/channel, including the length of the first path/channel element with a contoured/textured inner diameter surface; and the second flow resistance may be weakly dependent on the bifurcated fluid flow in the first fluid path/channel.

[0034] The corresponding first flow resistance may be controllable via an actuator control valve in a second fluid path/channel; and the corresponding second flow resistance may be weakly dependent on the bifurcated fluid flow in the second fluid path/channel.
the corresponding first flow resistance may be controllable via an actuator control valve in a second fluid path/channel; and the corresponding second flow resistance may be weakly dependent on the bifurcated fluid flow in the second fluid path/channel.

[0035] The two pipe paths/channels may be fluidically connected at a center bridge point with the balance flow meter configured to detect in the bifurcated fluid flow through the two pipe paths/channels.

[0036] The balance flow meter may be a Coriolis meter configured to read zero when the bridge is balanced.

[0037] The two pipe paths/channels may be fluidically connected at a center bridge point with a Coriolis meter configured to detect in the fluid flow through the two pipe paths/channels, and the signaling received from the Coriolis meter may contain information about the total flow rate, including where a measure of flow through the Coriolis meter is proportional to the total flow rate through the bridge.

[0038] The first flow resistance may be controllable via an actuator control valve in a first fluid path/channel; the second flow resistance may be weakly dependent on the bifurcated fluid flow in the first fluid path/channel; the corresponding first flow resistance may be controllable via a corresponding actuator control valve in a second fluid path/channel; and the corresponding second flow resistance may be weakly dependent on the bifurcated fluid flow in the second fluid path/channel.

BRIEF DESCRIPTION OF THE DRAWING



[0039] The drawing includes Figures 1 - 5B, which are not drawn to scale, as follows:

Figure 1A is a block diagram of apparatus having a signal processor or signal processing module for implementing the signal processing according to the present invention.

Figure 1B is a flowchart of a method having steps for implementing the signal processing according to the present invention.

Figure 2 includes Fig 2A and 2B, where Figure 2A is a diagram showing apparatus for generating an upstream modulated standing wave causing induced flow perturbations that channelize the fluid flow for sensing using downstream SONAR-based sensing and processing, according to some embodiments of the present invention; and where Figure 2B is a diagram showing apparatus for generating an upstream modulated standing wave causing induced flow perturbations in the fluid flow sensed using downstream SONAR-based sensing and processing, according to some embodiments of the present invention.

Figure 3 includes Fig 3A and 3B, where Figure 3A is a diagram showing the upstream modulated standing wave causing the induced flow perturbations in the fluid flow for sensing downstream, according to some embodiments of the present invention; and where Figure 3B is a diagram showing the upstream modulated standing wave causing the induced flow perturbations in the fluid flow, two pairs of downstream PVDF bands arranged on opposite sides of the pipe, and a SONAR-based processing unit, according to some embodiments of the present invention.

Figure 4 is a diagram showing apparatus for bifurcating the fluid flow causing directional fluid flow changes that channelizes the fluid flow for sensing in two flow paths, according to some examples not covered by the claims and not part of the invention.



[0040] Figure 5 includes Fig 5A and 5B, where Figure 5A shows a fixed bridge circuit for analogizing the bifurcating of a fluid flow causing directional fluid flow changes that channelizes the fluid flow for sensing in two flow paths, according to some examples not covered the claims and not part of the invention; and where Figure 5B shows a variable bridge circuit for analogizing the bifurcating of a fluid flow causing directional fluid flow changes that channelizes the fluid flow for sensing in two flow paths, according to some examples not covered by the claims and not part of the invention.

DETAILED DESCRIPTION



[0041] By way of example, Figure 1A shows apparatus generally indicated as 100, e.g. having at least one signal processor or signal processing module 102 for implementing the signal processing functionality according to the present invention. In operation, the at least one signal processor or signal processing module 102 may be configured at least to:

receive signaling Sin containing information about a fluid flow passing through a pipe that is channelized causing flow variations in the fluid flow; and

determine corresponding signaling Sout containing information about a fluid flow characteristic of the fluid flow that depends on the flow variations caused in the fluid flow channelized, based upon the signaling received.



[0042] The at least one signal processor or signal processing module 102 may also be configured to provide the corresponding signaling Sout. By way of example, the corresponding signaling Sout provided may include, take the form of, or contain information about the fluid flow characteristic of the fluid flow that depends on the flow variations caused in the fluid flow channelized.

[0043] For example, a person skilled in the art would appreciate and understanding without undue experimentation, especially after reading the instant patent application together with that known in the art, e.g., how to implement suitable signaling processing functionality to make one or more such determinations.

Figures 2A though 3B



[0044] In summary, Figures 2A through 3B show techniques according to the present invention based upon using a modulated ultrasonic standing wave that can induce flow perturbations in a fluid flow in a pipe. The techniques take on the form of a so-called Coriolis-like flowmeter.

[0045] By way of example, a strong standing wave may be generated upstream that 'channelizes' the flow through nodes in the standing wave generated.

[0046] Frequency modulation of an ultrasonic transducer about the resonant frequency will spatially shift the standing wave at the modulation frequency.

[0047] The motion of the 'comb imparts momentum into the flow stream.

[0048] This momentum is proportional to the mass of the flow passing through the comb per unit time

[0049] Lateral momentum is manifested as pressure variations downstream on the pipe-wall.

[0050] Pressure variations, e.g., detected by segmented PVDF bands arranged on the pipe, are proportional to the total comb-displaced flow mass per unit time.

[0051] Pressure differential (left - right) is a function of the imparted momentum.

[0052] Phase difference between sensor pairs (1) and (2) is proportional to the flow velocity.

[0053] This approach may be used to yield mass, flow rate and density.

Figure 2A



[0054] By way of example, Figure 2A shows apparatus generally indicated as 10 according to the present invention, in which "synchronous" SONAR processing may be used in conjunction with a modulated ultrasonic standing wave that can induce flow perturbations.

[0055] In Figure 2A, the apparatus 10 includes an ultrasonic combination having one or more ultrasonic drivers 12, a PZT ultrasonic Transmitter (Tx) 14 arranged on one side of a pipe P, an ultrasonic reflector plate 16 arranged on an opposite side of the pipe P, which together combine to generate a standing wave SW across the pipe P at the resonances of the ultrasonic signals, e.g., when the ultrasonic frequency (fu) matches frequencies m*fp, where the term fp is the across-pipe' fundamental frequency, and the term m is the harmonic number. This relationship is determined by, and depends on ,the pipe diameter and fluid speed of sound (SoS). By way of an example, this produces a spatial period of ∼ 0.5 mm in the standing wave in water (@ 1.5MHz). The modulation of the ultrasonic frequency (fu) sweeps this standing wave SW back and forth across the flow cross-section and imparts lateral momentum into the flow in the pipe.

[0056] In Figure 2A, the apparatus 10 also includes a SONAR-based head or device 18 arranged on the pipe P downstream of the ultrasonic combination, that senses the lateral momentum imparted into the flow, and provides SONAR-based signaling 18a containing information about the lateral momentum imparted into the flow. By way of example, the SONAR-based head or device 18 may take the form of a device known in the industry as SONARtrac®, which was developed by the assignee of the present application.

[0057] In Figure 2A, the apparatus 10 also includes a synchronous SONAR processing unit, which may include, or take the form of, a signal processor or signal processing module like element 102 (Fig. 1). In operation, the synchronous SONAR processing unit receives ultrasonic driver signaling FM (fm) 12a containing information about the standing wave SW generated, and also receives SONAR-based signaling 18a containing information about the lateral momentum imparted into the flow, which together contain information about the fluid flow passing through the pipe P that is channelized causing flow variations in the fluid flow. In response to this signaling received, the synchronous SONAR processing unit determines corresponding signaling containing information about a fluid flow characteristic of the fluid flow that depends on the flow variation caused in the fluid flow channelized.

Figure 2B



[0058] By way of further example, Figure 2B shows apparatus generally indicated as 20 according to the present invention, in which "synchronous" SONAR processing may be used in conjunction with a modulated ultrasonic standing wave that can induce flow perturbations.

[0059] In Figure 2B, elements similar to those shown in Figure 2A have similar reference numbers. Moreover, the differences between that shown in Figures 2A and 2B are set forth as follows:

[0060] In contrast to that shown in Figure 2A, the apparatus 20 shown in Figure 2B uses a double ultrasonic transmitter (Tx1, Tx2) system arranged on opposite sides of the pipe P. In effect, the ultrasonic reflector plate 16 is replaced by a second ultrasonic transmitter (Tx2) system having one or more second ultrasonic drivers 13 and a second PZT ultrasonic transmitter (Tx2) 15. In operation, each ultrasonic transmitter (Tx1, Tx2) system generates a standing wave on the opposite sides of the pipe P. The double ultrasonic (Tx1, Tx2) system allows for more control over the standing wave modulation, as a person skilled in the art would appreciate.

Figure 3A



[0061] Figure 3A shows an illustration generally indicated as 30 of how a modulated ultrasonic standing wave imparts lateral momentum in the downstream flow. For example, in Figure 3A the lateral motion of the standing wave SW generated is indicated by an up/down arrow a0, and the oscillating momentum induced in the flow in the pipe P is indicated by an upstream downwardly pointing arrow a1 and a downstream upwardly pointing arrow a2. The oscillating momentum induced in the flow in the pipe P is detectable by a downstream SONAR-based array as a periodic pressure variation, e.g., consistent with that set forth herein.

Figure 3B: The Virtual Coriolis-Like Flowmeter Concept



[0062] By way of example, Figure 3B shows apparatus generally indicated as 40 according to the present invention that takes the form of a virtual Coriolis-like flowmeter arranged downstream of a standing wave SW generated upstream. Similar to that shown in Figure 3A, in Figure 3B the lateral motion of the standing wave SW generated is indicated by an up/down arrow a0, and the oscillating momentum induced in the flow in the pipe P is indicated by an upstream downwardly pointing arrow a1 and a downstream upwardly pointing arrow a2. The oscillating momentum induced in the flow in the pipe P is detectable by a downstream SONAR-based array as a periodic pressure variation, e.g., consistent with that set forth herein.

[0063] Figure 3B shows the downstream SONAR-based array in the form of PVDF bands that pick up side-wall pressure variations as indicated by arrow a4. By way of example, one set of PVDF bands are indicated as reference labels 18(1a), 18(1b), and the other set of PVDF bands arranged further downstream on the pipe P are indicated as reference labels 18(2a), 18(2b). The PVDF bands 18(1a), 18(1b) respond to the pressure variations and provide respective PVDF band signaling S1a, S1b; S2a, S2b containing information about the lateral momentum imparted into the flow, which form part of the signaling information about the fluid flow passing through the pipe P that is channelized causing flow variations in the fluid flow.

[0064] In Figure 3B, the apparatus also includes a SONAR-based processing unit, which may include, or take the form of, a signal processor or signal processing module like element 102 (Fig. 1). The synchronous SONAR processing unit may be configured with signal processing modules 102a, 102b, 102c for implementing the following signal processing functionality. For example, the signal processing modules 102a may be configured to receive the respective PVDF band signaling S1a, S1b, as well as the ultrasonic driver signaling FM (fm) as described herein, and determine first difference signaling 102a' containing information about a difference proportional to the modulation frequency (MF) in relation to the pressure variation sensed by the PVDF bands 18(1a), 18(1b). In addition, the signal processing modules 102b may be configured to receive the respective PVDF band signaling S2a, S2b, as well as the ultrasonic driver signaling FM (fm) as described herein, and determine second difference signaling 102b' containing information about a difference proportional to the modulation frequency (MF) in relation to the pressure variation sensed by the PVDF bands 18(2a), 18(2b). Furthermore, the signal processing modules 102c may be configured to receive the first difference signaling 102a' and the second difference signaling 102b', and determine third signaling containing information about a phase difference proportional to a flow rate. The SONAR-based processing unit may be configured to further process the third signaling in order to determine suitable corresponding signaling containing information about the flow rate of the fluid flow in the pipe, as well as other fluid flow characteristics like density and mass flow, e.g., consistent with that set forth herein.

Figure 4: Bridge Flowmeter (for Laminar Flow):



[0065] By way of example not covered by the claims and not part of the invention, Figure 4 shows apparatus generally indicated as 50 that takes the form of a bridge flowmeter, which operates as follows:
Flow in the pipe is bifurcated into two flow paths (1) and (2).

[0066] Flow path 1 comprises two flow elements 1a, 1b that have or provide resistance to the flow of fluid.

[0067] The first element 1a, has a resistance Rx to flow that is strongly dependent on the flow rate (such as a length of pipe with contoured/Textured ID surface), and the second element 1b has a flow resistance which is weakly dependent on flow.

[0068] Flow path 2 comprises two corresponding elements 2a, 2b that have corresponding resistance to the flow of fluid.

[0069] The first element 2a has a resistance to flow that is controllable via an actuator control valve 51, the second element 2b, and also has a flow resistance which is weakly dependent on flow.

[0070] The bridge flowmeter 50 may also include a meter 52 configured to detect any imbalance in the bridge flowmeter 50. By way of example, the meter 52 may include, or take the form of, a small bore Coriolis meter that is a sensitive flowmeter, e.g., connected at a bridge center point as shown.

[0071] When the bridge flowmeter 50 is balanced, the small bore Coriolis meter 52 will provide meter signaling 52a containing information about a reading of a zero flow.

[0072] As the input flow rate increases, the flow resistance Rx increases, and the flow resistance Rc will need to be adjusted to rebalance the flow (to null the Coriolis reading). The bridge flowmeter 50 may include a null seeking control loop 54 that responds to the meter signaling 52a, and provides control loop signal 54a to the actuator control valve 51 to adjust and rebalance the flow.

[0073] In operation, a measurement of the flow resistance Rc (actuation level) corresponds to a measure of the total flow rate, and may be used to determine the flow rate characteristic related to the flow rate of the fluid flow in the pipe.

Figures 5A and 5B: Resistive Bridge Flowmeter Concepts



[0074] Figures 5A and 5B show illustrations analogous to resistive bridge flowmeter concepts, that are not part of the invention.

[0075] Figure 5A shows a fixed bridge analog circuit having current I bifurcated at a point C from one flow path into two flow paths having current I1 and I2, and rejoined at a point D back into one flow path having the current I. The first flow path includes fixed resistances R1 and R3 joined at a center point A, and the second flow path includes fixed resistances R2 and R4 joined at a center point B. A voltage device Vab is configured between the two center points A and B. In operation, the fixed bridge analog circuit is balanced if: the ratio of R1/R3 = R2/R4, such that Vab = 0. In contrast, the fixed bridge analog circuit is not balanced if: the ratio of R1/R3 > R2/R4 or R1/R3 < R2/R4, such that Vab is not 0.

[0076] In comparison, Figure 5B shows a variable bridge analog circuit having current I bifurcated at a point C from one flow path into two flow paths having current I1 and I2., and rejoined at a point D back into one flow path having the current I. The first flow path includes an unknown (variable) resistance Rx and a fixed resistance R3 joined at a center point A, and the second flow path includes a controllable (known) resistance Rc and a fixed resistance R4 joined at a center point B. A voltage device Vab is configured between the two center points A and B. In operation, the variable bridge analog circuit is balanced if: Rx = the product of Rc times the ratio (R3/R4), such that Vab = 0.

[0077] In each case, the principle can also be applied with a balanced bridge, where all resistances are flow-dependent. Similar to that set forth above, a measure of flow through the Coriolis meter is then proportional to the total flow rate through the bridge.

The Signal Processor or Processor Module 102



[0078] The functionality of the signal processor or processor module 102 may be implemented using hardware, software, firmware, or a combination thereof. In a typical software implementation, the processor module may include one or more microprocessor-based architectures having a microprocessor, a random access memory (RAM), a read only memory (ROM), input/output devices and control, data and address buses connecting the same, e.g., consistent with that shown in Figure 1, e.g., see element 104. A person skilled in the art would be able to program such a microprocessor-based architecture(s) to perform and implement such signal processing functionality described herein without undue experimentation. The scope of the invention is not intended to be limited to any particular implementation using any such microprocessor-based architecture or technology either now known or later developed in the future.

[0079] By way of example, the apparatus 100 may also include, e.g., other signal processor circuits or components 104 that do not form part of the underlying invention, e.g., including input/output modules, one or more memory modules, data, address and control busing architecture, etc. In operation, the at least one signal processor or signal processing module 102 may cooperation and exchange suitable data, address and control signaling with the other signal processor circuits or components 104 in order to implement the signal processing functionality according to the present invention. By way of example, the signaling Sin may be received by such an input module, provided along such a data bus and stored in such a memory module for later processing, e.g., by the at least one signal processor or signal processing module 102. After such later processing, processed signaling resulting from any such determination may be stored in such a memory module, provided from such a memory module along such a data bus to such an output module, then provided from such an output module as the corresponding signaling Sout, e.g., by the at least one signal processor or signal processing module 102.

Figure 1B



[0080] Figure 1B shows a flowchart generally indicated as 110 for a method having steps 110a, 110b and 110c for implementing the signal processing functionality, e.g., with at least one signal processor or signal processing module like element 102 in Figure 4, according to some embodiments of the present invention.

[0081] The method 100 may include a step 110a for responding with at least one signal processor or signal processing module to signaling containing information about a fluid flow passing through a pipe that is channelized causing flow variations in the fluid flow; and a step 110b for determining with the at least one signal processor or signal processing module corresponding signaling containing information about a fluid flow characteristic of the fluid flow that depends on the flow variations caused in the fluid flow channelized, based upon the signaling received. The method 100 may also include a step 110c for providing the corresponding signaling, including where the corresponding signaling provided contains information about the fluid flow characteristic of the fluid flow that depends on the flow variations caused in the fluid flow channelized.

[0082] The method may also include one or more steps for implementing other features of the present invention set forth herein, including steps for making the various determinations associated with one or more signal processing algorithms or techniques, e.g., consistent with that set forth herein.

SONAR-Based Meters



[0083] The SONAR-based meters like element 18 are known in the art and may take the form of a SONAR-based VF/GVF-100 meter, developed by the assignee of the present application, and disclosed by way of example in whole or in part in United States Patent Nos. 7,165,464; 7,134,320; 7,363,800; 7,367,240; and 7,343,820. The scope of the invention is also intended to include other types or kinds of SONAR-based VF/GVF meters either now known or later developed in the future that perform the same basic functionality of the SONAR-based VF/GVF meter 12 as such functionality relates to implementing the present invention.

The Scope of the Invention



[0084] While the invention has been described with reference to an exemplary embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the claims. In addition, may modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope of the claims. Therefore, it is intended that the invention not be limited to the particular embodiment(s) disclosed herein as the best mode contemplated for carrying out this invention.


Claims

1. Apparatus (10, 20, 40) comprising:
a signal processor or processing module (102) configured to:

receive signaling containing information about a fluid flow passing through a pipe (P) that is channelized causing flow variations in the fluid flow; and

determine corresponding signaling containing information about a fluid flow characteristic of the fluid flow that depends on the flow variations caused in the fluid flow channelized, based upon the signaling received,

characterized in that the signaling contains information about the fluid flow that is channelized by inducing flow perturbations caused by a modulated standing wave across the pipe (P) that sweeps back and forth across a flow cross-section of the pipe (P) and imparts lateral momentum into a combed fluid flow.


 
2. Apparatus according to claim 1, wherein the signal processor or processing module (102) is configured to provide the corresponding signaling, including where the corresponding signaling contains information about the fluid flow characteristic of the fluid flow channelized.
 
3. Apparatus according to claim 1, wherein the signaling contains information about the modulated standing wave generated by an ultrasonic driver combination (12 - 16) arranged in relation to the pipe (P).
 
4. Apparatus according to claim 3, wherein the signaling contains information about the modulated standing wave sensed by a SONAR-based sensing module (18) arranged in relation to the pipe (P) upstream from the ultrasonic driver combination.
 
5. Apparatus according to claim 4, wherein
the ultrasonic driver combination comprises ultrasonic drivers (12) arranged on one side of the pipe (P) and an ultrasonic reflector plate (16) arranged on an opposite side of the pipe (P); or
the ultrasonic driver combination comprises first ultrasonic drivers (12) arranged on one side of the pipe (P) and second ultrasonic drivers (13) arranged on an opposite side of the pipe (P); or
the signal processor or processing module (102) is configured as a synchronous SONAR processing module; or
the fluid flow characteristic determined includes fluid mass, flow rate or density; or
the apparatus comprises the SONAR-based sensing module (18) and the ultrasonic driver combination (12 - 16).
 
6. Apparatus according to claim 4, wherein
the signaling received from the SONAR-based sensing module (18) contains information about oscillating momentum induced in the combed fluid flow through the pipe (P) sensed with segmented PVDF bands (18(1a) - 18 (2b)) that pick up pipe side wall pressure variations on opposite sides of the pipe (P); and
the signaling received from the SONAR-based sensing module (18) contains information about the oscillating momentum induced in the combed fluid flow through the pipe (P) sensed with first PVDF bands (18(1a)) arranged on one side of the pipe (P) and second PVDF bands (18(1b)) arranged on an opposite side of the pipe (P), the first PVDF bands (18(1a) and the second PVDF bands (18(1b) arranged axially at a predetermined location along the pipe (P), and the signal processor or processing module (102) is configured to determine a difference proportional to a modulation frequency of the modulated standing wave caused by the oscillating momentum induced in the combed fluid flow.
 
7. Apparatus according to claim 6, wherein
the signaling received from the SONAR-based sensing module (18) contains information about the oscillating momentum induced in the combed fluid flow through the pipe (P) sensed with corresponding first PVDF bands (18(2a)) arranged on one corresponding side of the pipe (P) and corresponding second PVDF bands (18(2b)) arranged on a corresponding opposite side of the pipe (P), the corresponding first PVDF bands (18(2a)) and the corresponding second PVDF bands (18(2b)) arranged axially at a different predetermined location along the pipe (P) than the first PVDF bands (18(1a)) and the second PVDF bands (18(1b)); and
the signal processor or processing module (102) is configured to determine a corresponding difference proportional to the modulation frequency of the modulated standing wave caused by the oscillating momentum induced in the fluid flowing through the pipe (P).
 
8. Apparatus according to claim 7, wherein
the signal processor or processing module (102) is configured to determine a phase difference proportional to a flow rate based upon the difference and corresponding difference proportional to the modulation frequency of the modulated standing wave caused by the oscillating momentum induced in the combed fluid flow through the pipe (P); and
the apparatus (10, 20, 40) comprises the SONAR-based sensing module (18) and the ultrasonic driver combination (12 - 16).
 
9. Apparatus according to claim 1, wherein
the modulated standing wave has a resonant frequency that is spatially shifted at a modulation frequency so as to act as a "comb" and channelizes the combed fluid flow through nodes in the modulated standing wave;
the motion of the "comb" imparts the lateral momentum into the fluid flow through the pipe (P);
the lateral momentum is proportional to the mass of the fluid flow through the pipe (P); and
the lateral momentum causes pressure variations downstream on a pipe wall that are sensed by segmented PVDF bands (18(1a) - 18(2b)) arranged on the pipe wall and that are proportional to a total comb-displaced flow mass per unit time.
 
10. A method comprising:

receiving in a signal processor or processing module (102) signaling containing information about a fluid flow passing through a pipe (P) that is channelized causing flow variations in the fluid flow;

determining with the signal processor or processing module (102) corresponding signaling containing information about a fluid flow characteristic of the fluid flow that depends on the flow variations caused in the fluid flow channelized, based upon the signaling received; and

providing with the signal processor or processing module (102) the corresponding signaling, including where the corresponding signaling contains information about the fluid flow characteristic of the fluid flow channelized,

characterized in that the signaling contains information about the fluid flow that is channelized by inducing flow perturbations caused by a modulated standing wave across the pipe (P) that sweeps back and forth across a flow cross-section of the pipe (P) and imparts lateral momentum into a combed fluid flow.


 


Ansprüche

1. Vorrichtung (10, 20, 40), aufweisend:
einen Signalprozessor oder ein Signalprozessormodul (102), der bzw. das ausgebildet ist zum:

Empfangen einer Signalgabe, die Information über einen durch ein Rohr (P) fließenden Fluidstrom enthält, der kanalisiert wird, so dass Strömungsschwankungen in dem Fluidstrom verursacht werden; und

Bestimmen einer entsprechenden Signalgabe, die Information über eine Fluidströmungscharakteristik des Fluidstroms enthält, die von den Strömungsschwankungen abhängt, die in dem kanalisierten Fluidstrom verursacht werden, auf der Basis der empfangenen Signalgabe,

dadurch gekennzeichnet, dass die Signalgabe Information über den Fluidstrom enthält, der kanalisiert wird, indem Strömungsstörungen induziert werden, die durch eine modulierte stehende Welle über das Rohr (P) hinweg verursacht werden, die über einen Strömungsquerschnitt des Rohrs (P) hin und her läuft und einen seitlichen Impuls in einen gekämmten Fluidstrom einbringt.


 
2. Vorrichtung nach Anspruch 1,
wobei der Signalprozessor oder das Signalprozessormodul (102) dazu ausgebildet ist, die entsprechende Signalgabe bereitzustellen, wobei dies den Ort beinhaltet, an dem die entsprechende Signalgabe Information über die Fluidströmungscharakteristik des kanalisierten Fluidstroms enthält.
 
3. Vorrichtung nach Anspruch 1,
wobei die Signalgabe Information über die modulierte stehende Welle enthält, die durch eine in Relation zu dem Rohr (P) angeordnete Ultraschalltreiberkombination (12 - 16) erzeugt wird.
 
4. Vorrichtung nach Anspruch 3,
wobei die Signalgabe Information über die modulierte stehende Welle enthält, die von einem SONAR-basierten Erfassungsmodul (18) erfasst wird, das in Relation zu dem Rohr (P) stromaufwärts von der Ultraschalltreiberkombination angeordnet ist.
 
5. Vorrichtung nach Anspruch 4,
wobei die Ultraschalltreiberkombination Ultraschalltreiber (12) aufweist, die auf einer Seite des Rohrs (P) angeordnet sind, und eine Ultraschallreflektorplatte (16) aufweist, die auf einer gegenüberliegenden Seite des Rohrs (P) angeordnet ist; oder
wobei die Ultraschalltreiberkombination erste Ultraschalltreiber (12) aufweist, die auf einer Seite des Rohrs (P) angeordnet sind, und zweite Ultraschalltreiber (13) aufweist, die auf einer gegenüberliegenden Seite des Rohrs (P) angeordnet sind; oder
wobei der Signalprozessor oder das Signalprozessormodul (102) als synchrones SONAR-Prozessormodul ausgebildet ist; oder
wobei die ermittelte Fluidströmungscharakteristik Fluidmasse, Strömungsrate oder Dichte beinhaltet; oder
wobei die Vorrichtung das SONAR-basierte Erfassungsmodul (18) und die Ultraschalltreiberkombination (12 - 16) aufweist.
 
6. Vorrichtung nach Anspruch 4,
wobei die von dem SONAR-basierten Erfassungsmodul (18) empfangene Signalgabe Information über einen Schwingungsimpuls enthält, der in dem gekämmten Fluidstrom durch das Rohr (P) induziert wird und der mit segmentierten PVDF-Bändern (18(1a)) - 18(2b)) erfasst wird, die Rohrseitenwand-Druckschwankungen auf gegenüberliegenden Seiten des Rohrs (P) erfassen; und
wobei die von dem SONAR-basierten Erfassungsmodul (18) empfangene Signalgabe Information über den Schwingungsimpuls enthält, der in dem gekämmten Fluidstrom durch das Rohr (P) induziert wird und der mit ersten PVDF-Bändern (18(1a)) erfasst wird, die auf der einen Seite des Rohrs angeordnet sind, sowie mit zweiten PVDF-Bändern (18(1b)) erfasst wird, die auf einer gegenüberliegenden Seite des Rohrs (P) angeordnet sind, wobei die ersten PVDF-Bänder (18(1a)) und die zweiten PVDF-Bänder (18(1b)) axial an einer vorbestimmten Stelle entlang des Rohrs (P) angeordnet sind, und wobei der Signalprozessor oder das Signalprozessormodul (102) dazu ausgebildet ist, eine Differenz proportional zu einer Modulationsfrequenz der modulierten stehenden Welle zu bestimmen, die durch den in dem gekämmten Fluidstrom induzierten Schwingungsimpuls verursacht wird.
 
7. Vorrichtung nach Anspruch 6,
wobei die von dem SONAR-basierten Erfassungsmodul (18) empfangene Signalgabe Information über den Schwingungsimpuls enthält, der in dem gekämmten Fluidstrom durch das Rohr (P) induziert wird und der mit entsprechenden ersten PVDF-Bändern (18(2a)) erfasst wird, die auf einer entsprechenden Seite des Rohrs (P) angeordnet sind, und mit entsprechenden zweiten PVDF-Bändern (18(2b)) erfasst wird, die auf einer entsprechenden gegenüberliegenden Seite des Rohrs (P) angeordnet sind, wobei die entsprechenden ersten PVDF-Bänder (18(2a)) und die entsprechenden zweiten PVDF-Bänder (18(2b)) axial an einer anderen vorbestimmten Stelle entlang des Rohrs (P) als die ersten PVDF-Bänder (18(1a)) und die zweiten PVDF-Bänder (18(1b)) angeordnet sind; und
wobei der Signalprozessor oder das Signalprozessormodul (102) dazu ausgebildet ist, eine entsprechende Differenz proportional zu der Modulationsfrequenz der modulierten stehenden Welle zu bestimmen, die durch den Schwingungsimpuls verursacht wird, der in dem durch das Rohr (P) strömenden Fluid induziert wird.
 
8. Vorrichtung nach Anspruch 7,
wobei der Signalprozessor oder das Signalprozessormodul (102) dazu ausgebildet ist, eine Phasendifferenz proportional zu einer Strömungsrate auf der Basis der Differenz und einer entsprechenden Differenz proportional zu der Modulationsfrequenz der modulierten stehenden Welle zu bestimmen, die durch den Schwingungsimpuls verursacht wird, der in dem gekämmten Fluidstrom durch das Rohr (P) induziert wird; und
wobei die Vorrichtung (10, 20, 40) das SONAR-basierte Erfassungsmodul (18) und die Ultraschalltreiberkombination (12 - 16) aufweist.
 
9. Vorrichtung nach Anspruch 1,
wobei die modulierte stehende Welle eine Resonanzfrequenz aufweist, die mit einer Modulationsfrequenz räumlich verschoben ist, um als "Kamm" zu wirken, und die den gekämmten Fluidstrom durch Knotenpunkte in der modulierten stehenden Welle kanalisiert;
wobei die Bewegung des "Kamms" den seitlichen Impuls in den Fluidstrom durch das Rohr (P) einbringt;
wobei der seitliche Impuls proportional zu der Masse des Fluidstroms durch das Rohr (P) ist; und
wobei der seitliche Impuls Druckschwankungen stromabwärts an einer Rohrwand verursacht, die durch an der Rohrwand angeordnete, segmentierte PVDF-Bänder (18(1a) - 18(2b)) erfasst werden und die proportional zu einer gesamten kammverlagerten Strömungsmasse pro Zeiteinheit sind.
 
10. Verfahren, das folgende Schritte aufweist:

in einem Signalprozessor oder Signalprozessormodul (102) erfolgendes Empfangen einer Signalgabe, die Information über einen durch ein Rohr (P) fließenden Fluidstrom enthält, der kanalisiert wird, so dass Strömungsschwankungen in dem Fluidstrom verursacht werden;

mittels des Signalprozessors oder Signalprozessormoduls (102) erfolgendes Bestimmen einer entsprechenden Signalgabe, die Information über eine Fluidströmungscharakteristik des Fluidstroms enthält, die von den Strömungsschwankungen abhängt, die in dem kanalisierten Fluidstrom verursacht werden, auf der Basis der empfangenen Signalgabe; und

mittels des Signalprozessors oder Signalprozessormoduls (102) erfolgendes Bereitstellen der entsprechenden Signalgabe, wobei dies den Ort beinhaltet, an dem die entsprechende Signalgabe Information über die Fluidströmungscharakteristik des kanalisierten Fluidstroms enthält,

dadurch gekennzeichnet, dass die Signalgabe Information über den Fluidstrom enthält, der kanalisiert wird, indem Strömungsstörungen induziert werden, die durch eine modulierte stehende Welle über das Rohr (P) hinweg verursacht werden, die über einen Strömungsquerschnitt des Rohrs (P) hin und her läuft und einen seitlichen Impuls in einen gekämmten Fluidstrom einbringt.


 


Revendications

1. Appareil (10, 20, 40) comprenant :
un processeur de signaux ou un module de traitement de signaux (102) configuré pour :

recevoir une signalisation contenant des informations concernant un écoulement de fluide passant à travers un tuyau (P), qui est découpé en canaux, ce qui donne lieu à des variations d'écoulement dans l'écoulement de fluide ; et

déterminer une signalisation correspondante contenant des informations concernant des caractéristiques d'écoulement de fluide de l'écoulement de fluide qui dépendent des variations d'écoulement déclenchées dans l'écoulement de fluide découpé en canaux, en se basant sur la signalisation reçue ;

caractérisé en ce que la signalisation contient des informations concernant l'écoulement de fluide qui est découpé en canaux en induisant des perturbations d'écoulement déclenchées par une onde stationnaire modulée à travers le tuyau (P), qui effectue un balayage en va-et-vient à travers une section transversale d'écoulement du tuyau (P) et qui confère une impulsion latérale dans le but d'obtenir un écoulement de fluide peigné.


 
2. Appareil selon la revendication 1, dans lequel le processeur de signaux ou le module de traitement de signaux (102) est configuré pour procurer la signalisation correspondante, y compris lorsque la signalisation correspondante contient des informations concernant les caractéristiques d'écoulement de fluide de l'écoulement de fluide découpé en canaux.
 
3. Appareil selon la revendication 1, dans lequel la signalisation contient des informations concernant l'onde stationnaire modulée générée par une combinaison de dispositifs de commande à ultrasons (12 - 16) agencée par rapport au tuyau (P).
 
4. Appareil selon la revendication 3, dans lequel la signalisation contient des informations concernant l'onde stationnaire modulée détectée par un module de détection (18) basé sur un SONAR agencé par rapport au tuyau (P) en amont de la combinaison des dispositifs de commande à ultrasons.
 
5. Appareil selon la revendication 4, dans lequel :

la combinaison de dispositifs de commande à ultrasons comprend des dispositifs de commande à ultrasons (12) disposés sur un côté du tuyau (P) et une plaque (16) faisant office de réflecteur d'ultrasons disposée sur un côté opposé du tuyau (P) ; ou

la combinaison de dispositifs de commande à ultrasons comprend des premiers dispositifs de commande à ultrasons (12) disposés sur un côté du tuyau (P) et des seconds dispositifs de commande à ultrasons (13) disposés sur un côté opposé du tuyau (P) ; ou

le processeur de signaux ou le module de traitement de signaux (102) est configuré sous la forme d'un module de traitement synchrone de type SONAR ; ou

les caractéristiques déterminées de l'écoulement de fluide englobent la masse du fluide, le débit ou la masse volumique ; ou

l'appareil comprend le module de détection (18) basé sur un SONAR et la combinaison de dispositifs de commande à ultrasons (12 - 16).


 
6. Appareil selon la revendication 4, dans lequel
la signalisation reçue à partir du module de détection (18) basé sur un SONAR contient des informations concernant l'impulsion d'oscillation induite dans l'écoulement de fluide peigné à travers le tuyau (P), détectées avec des bandes segmentées de PVDF (18(la) - 18(2b)) qui captent des variations de pression s'exerçant sur les parois latérales du tuyau, sur les côtés opposés du tuyau (P) ; et
la signalisation reçue à partir du module de détection (18) basé sur un SONAR contient des informations concernant l'impulsion d'oscillation induite dans l'écoulement de fluide peigné à travers le tuyau (P), détectées avec des premières bandes de PVDF (18(1a)) disposées sur un côté du tuyau (P) et avec des secondes bandes de PVDF (18(lb)) disposées sur un côté opposé du tuyau (P), les premières bandes de PVDF (18(la)) et les secondes bandes de PVDF (18(lb)) étant agencées en direction axiale à un endroit prédéterminé le long du tuyau (P), et le processeur de signaux ou le module de traitement de signaux (102) est configuré pour déterminer une différence proportionnelle à une fréquence de modulation de l'onde stationnaire modulée, déclenchée par l'impulsion d'oscillation induite dans le courant de fluide peigné.
 
7. Appareil selon la revendication 6, dans lequel :

la signalisation reçue à partir du module de détection (18) basé sur un SONAR contient des informations concernant l'impulsion d'oscillation induite dans l'écoulement de fluide peigné à travers le tuyau (P), détectées avec des premières bandes correspondantes de PVDF (18(2a)) disposées sur un côté correspondant du tuyau (P) et avec des secondes bandes correspondantes de PVDF (18(2b)) disposées sur un côté opposé correspondant du tuyau (P), les premières bandes correspondantes de PVDF (18(2a)) et les secondes bandes correspondantes de PVDF (18(2b)) étant disposées en direction axiale à un endroit prédéterminé le long du tuyau (P), différent de celui auquel sont disposées les premières bandes de PVDF (18(1a)) et les secondes bandes de PVDF (18(lb)) ; et

le processeur de signaux ou le module de traitement de signaux (102) est configuré pour déterminer une différence correspondante proportionnelle à la fréquence de modulation de l'onde stationnaire modulée, déclenchée par l'impulsion d'oscillation induite dans le courant de fluide s'écoulant à travers le tuyau (P).


 
8. Appareil selon la revendication 7, dans lequel :

le processeur de signaux ou le module de traitement de signaux (102) est configuré pour déterminer une différence de phase proportionnelle à un débit, basée sur la différence et sur la différence correspondante proportionnelle à une fréquence de modulation de l'onde stationnaire modulée déclenchée par l'impulsion d'oscillation induite dans le courant de fluide peigné à travers le tuyau (P) ; et

l'appareil (10, 20, 40) comprend le module de détection (18) basé sur un SONAR et la combinaison de dispositifs de commande à ultrasons (12 - 16).


 
9. Appareil selon la revendication 1, dans lequel :

l'onde stationnaire modulée possède une fréquence de résonance qui est décalée dans l'espace à une fréquence de modulation de manière à agir à la manière d'un « peigne » et qui est découpée en canaux l'écoulement de fluide peigné à travers des nÅ“uds dans l'onde stationnaire modulée ;

le mouvement du « peigne » confère l'impulsion latérale à l'écoulement de fluide à travers le tuyau (P) ;

l'impulsion latérale est proportionnelle à la masse de l'écoulement de fluide à travers le tuyau (P) ; et

l'impulsion latérale déclenche des variations de pression en aval sur une paroi de tuyau, qui sont détectées par des bandes segmentées de PVDF (18(la) - 18(2b)) agencées sur la paroi du tuyau et qui sont proportionnelles à une masse totale d'écoulement déplacé par le peigne, par unité de temps.


 
10. Procédé comprenant le fait de :

recevoir, dans un processeur de signaux ou dans un module de traitement de signaux (102), une signalisation contenant des informations concernant un écoulement de fluide passant à travers un tuyau (P), qui est découpé en canaux, ce qui donne lieu à des variations d'écoulement dans l'écoulement de fluide ;

déterminer, avec le processeur de signaux ou avec le module de traitement de signaux (102), une signalisation correspondante contenant des informations concernant des caractéristiques d'écoulement de fluide de l'écoulement de fluide, qui dépendent des variations d'écoulement déclenchées dans l'écoulement de fluide découpé en canaux, en se basant sur la signalisation reçue ; et

procurer, avec le processeur de signaux ou le module de traitement de signaux (102), la signalisation correspondante y compris lorsque la signalisation correspondante contient des informations concernant les caractéristiques d'écoulement de fluide de l'écoulement de fluide découpé en canaux ;

caractérisé en ce que la signalisation contient des informations concernant l'écoulement de fluide qui est découpé en canaux en induisant des perturbations d'écoulement déclenchées par une onde stationnaire modulée à travers le tuyau (P) qui effectue un balayage en va-et-vient à travers une section transversale d'écoulement du tuyau (P) et qui confère une impulsion latérale dans le but d'obtenir un écoulement de fluide peigné.


 




Drawing





















REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description




Non-patent literature cited in the description