Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1982-07-22
1984-02-21
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
361283, G01L 912
Patent
active
044322380
ABSTRACT:
A capacitive type pressure sensing transducer comprised of a housing having a pressure sensitive element which interfaces with an applied pressure force to be sensed and measured and which moves in response to force changes to vary the volume of the housing in direct relation to such changes. The housing is filled with a fluid which is in fluid flow communication with a multi-capacitor fluid level sensor. The sensor is formed of a first pair of plate type capacitors of like fixed capacitive value and a second pair of plate type capacitors having like open dielectric spaces for receiving varying levels of fluid from the transducer housing in response to changes in the volume of the housing. Thus, a change in pressure applied to the pressure sensitive element of the transducer produces a corresponding change in the fluid level within the dielectric spaces of the second pair of capacitors of the sensor and a corresponding change in the capacitance value of such capacitors. The capacitors of the sensor are electrically connected into a classic alternating current Wheatstone bridge circuit and the current flow value of the circuit is measured as a direct, linearly-related value of the pressure force applied to the transducer.
REFERENCES:
patent: 4169389 (1979-10-01), Yasuhara et al.
Junkins Philip D.
Tward 2001 Limited
Woodiel Donald O.
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