Piezoelectric differential pressure vortex sensor

Details Piezoelectric differential pressure vortex sensor Piezoelectric differential pressure vortex sensor

G - Physics

01

L

G01L 9/08 (2006.01) G01F 1/32 (2006.01)

Patent

CA 2050915

A vortex sensor for measuring a flow rate of a fluid flowing through a flow passage is disclosed. The flow rate is measured by detecting alternating pressure variations generated by a shedding body placed in the flow passage. The vortex sensor includes a sensor housing having two cavities interconnected by a channel. An axle of a spool member is slideably disposed in the channel and allows each of two flange members, connected proximate each end of the axle, to shuttle back and forth with respect to the sensor housing. A piezoelectric sensing element and a biasing mechanism are disposed between the flange members and the sensor housing. The alternating pressure variations are applied to each flange member causing the spool member to shuttle back and forth. When the spool moves, mechanical forces are coupled to each sensing element by the biasing mechanisms. Circuitry, interconnected to the sensing elements, detects signals generated by the sensing elements as a result of forces applied to them.

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