EP 1342057 A1 20030910 - FLOW VELOCITY METER
Title (en)
FLOW VELOCITY METER
Title (de)
STRÖMUNGSGESCHWINDIGKEITS-MESSER
Title (fr)
VISCOSIMETRE DE FLUX
Publication
Application
Priority
- SE 0102541 W 20011115
- SE 0004219 A 20001115
Abstract (en)
[origin: WO0240948A1] In a flow velocity meter of ultrasonic type sound signals are transmitted in a ring-around-process between two ultrasonic transmitters/detectors (G1, G2) placed opposite each other, having their transmission /receiving direction located in an angle to the flow direction (3) of a fluid. In the transmitting operation the polarities of the transmitted sound pulses are changed to that the currently active one of the transmitters/receivers is controlled to transmit the sound signals with positive and negative polarities chosen to reduce the influence of sound signals reflected by the transmitters/receivers on the direct sound signals that are received by the other one of the transmitters/receivers. The transmission of the signals is activated by a pulse transmission unit (27) so that for example each sound signal contains two pulses transmitted successively. The polarities are controlled by a multiplexer (13) that receives a control signal from a control unit (25). A polarity change is also made for received signals by means of another multiplexer (11) so that the received signals always have the same polarity. It facilitates the detection of a particular position in the received signals such as a suitably chosen zero passing using a zero point detector (21).
IPC 1-7
IPC 8 full level
CPC (source: EP)
G01F 1/667 (2013.01); G01P 5/245 (2013.01)
Citation (search report)
See references of WO 0240948A1
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 0240948 A1 20020523; AU 1451802 A 20020527; EP 1342057 A1 20030910; SE 0004219 D0 20001115; SE 0004219 L 20020516; SE 517922 C2 20020806
DOCDB simple family (application)
SE 0102541 W 20011115; AU 1451802 A 20011115; EP 01983063 A 20011115; SE 0004219 A 20001115