Fluid flows through a conduit. To measure flow speed the fluid is heated at a heating location in the conduit with a time-dependent heating strength. A speed of sound in fluid flowing in the conduit is measured at a plurality of sensing locations downstream from said heating location. The flow speed of the fluid is determined from a delay with which the time dependence is detected in the sound speeds measured at said sensing locations. In an embodiment a frequency of the variation of heating strength that is used to determine the flow speed is selected automatically dependent on the flow speed and/or other circumstances.
申请公布号
EP2269012(A1)
申请公布日期
2011.01.05
申请号
EP20090727350
申请日期
2009.04.02
申请人
NEDERLANDSE ORGANISATIE VOOR TOEGEPAST -NATUURWETENSCHAPPELIJK ONDERZOEK TNO
发明人
VOLKER, ARNO WILLEM FREDERIK;GEERS, LEON FERDINAND GERARD;BLOKLAND, HUIBERT;HUNTER, THEODOOR PETER MARTIJN