EP 1728053 A2 20061206 - DETERMINATION OF THE PROPAGATION TIME DIFFERENCE IN AN ULTRASOUND FLOW SENSOR WITH MULTIPLE ZERO CROSSING DETECTION
Title (en)
DETERMINATION OF THE PROPAGATION TIME DIFFERENCE IN AN ULTRASOUND FLOW SENSOR WITH MULTIPLE ZERO CROSSING DETECTION
Title (de)
BESTIMMUNG DER LAUFZEITDIFFERENZ BEI EINEM ULTRASCHALL-STR M UNGSSENSOR MIT MEHRFACHER NULLDURCHGANGSDETEKTION
Title (fr)
DETERMINATION DE LA DIFFERENCE DE DUREE DE PROPAGATION SUR UN CAPTEUR DE RAYONNEMENT ULTRASONORE AVEC REPETITION DE DETECTION DE PASSAGE PAR ZERO
Publication
Application
Priority
- EP 2005050208 W 20050119
- DE 102004013249 A 20040318
Abstract (en)
[origin: WO2005090925A2] The invention relates to an ultrasound flow sensor, particularly for measuring a volume or mass flow of a fluid (1), comprising two ultrasound converters (A,B), which are offset in the direction of flow (Z) and which respectively transmit a periodic ultrasound signal (S1,S2) to the other ultrasound converter (B,A), and a control and evaluation unit (4) which detects several reception moments (ti',tI ) per ultrasound signal (S1,S2) when an ultrasound signal (S1,S2) is received by an ultrasound converter (B,A), enabling a measuring variable (S) to be determined therefrom. The accuracy of the measurement can be improved substantially if the control and evaluation unit (4) comprises at least two counters (5a,5b), whereby the first counter counts a time period ( DELTA t') from a first switching or reception moment (ti') of a signal (S2,P) at least until a first reception moment (tI ) of the ultrasound signal, and the second counter determines respectively the amount of time ( DELTA t ) between a first and second moment in time (ti',tI ), which are combined in pairs, of the signals (S1,S2,P).
IPC 8 full level
CPC (source: EP KR US)
G01F 1/66 (2013.01 - KR); G01F 1/667 (2013.01 - EP US); G01P 5/00 (2013.01 - KR); G01P 5/24 (2013.01 - KR); G01P 5/247 (2013.01 - EP US)
Citation (search report)
See references of WO 2005090925A2
Designated contracting state (EPC)
DE FR
DOCDB simple family (publication)
WO 2005090925 A2 20050929; WO 2005090925 A3 20051110; DE 102004013249 A1 20051006; EP 1728053 A2 20061206; JP 2007529724 A 20071025; KR 20070004724 A 20070109; US 2007162239 A1 20070712
DOCDB simple family (application)
EP 2005050208 W 20050119; DE 102004013249 A 20040318; EP 05701551 A 20050119; JP 2007503315 A 20050119; KR 20067018911 A 20060915; US 58768505 A 20050119