G - Physics – 01 – F
Patent
G - Physics
01
F
73/125, 73/67
G01F 1/56 (2006.01) G01F 1/32 (2006.01)
Patent
CA 1177667
ABSTRACT A vortex flow metering apparatus is equipped with a sensor unit having first and second piezoelectric sensors fixed in a cavity of a vortex generator which is partly located in a duct through which a measuring fluid flows to produce Karman's vortex according to the fluid velocity. A first conversion amplifier in which a signal from the first piezoelectric sensor is applied and a second conversion amplifier in which a signal from the second piezoelectric sensor is applied are provided. An operator in which an output of the first conversion amplifier and an output of the second conversion amplifier are applied removes a noise component due to a disturbance vibration. The first and second piezoelectric sensors are arranged at two points at which the stress distribution of the noise component due to the disturbance vibration and the stress distribution of the signal component due to the vortex dynamic lift are different from each other. The invention greatly reduces the noise component in the output signal from the vortex generator.
403946
Ando Tetsuo
Hirayama Masashi
Ito Ichizo
Tamura Hisashi
Smart & Biggar
Yokogawa Hokushin Electric Corporation
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