Method and system for sensing differential pressure with...

Details Method and system for sensing differential pressure with... Method and system for sensing differential pressure with...

2008-10-13

2009-11-03

Allen, Andre J (Department: 2855)

Measuring and testing

Fluid pressure gauge

Diaphragm

C073S715000

Reexamination Certificate

active

07610811

ABSTRACT:
A differential pressure sensor method and system includes a number of elastomer plates, which can be placed with certain distance and sealed in a small tube, wherein the tube can be connected to a number of detection areas. The surface of the elastomers can be covered with a thin film of conductive elastomer as a compliant electrode. The resistance of the compliant electrodes varies with deformation of the elastomer plates and the resistance change can be measured through circuits. A variable capacitor also exists between the elastomer plates due to a sealed space and the compliant electrodes. The elastomer plates deform accordingly when the pressure varies in the detection areas and the variation of the capacitance can be detected through circuits. The pressure difference between the detection areas can then be detected utilizing the variation in resistance and capacitance.

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patent: 7411331 (2008-08-01), Dubowsky et al.
patent: 7469714 (2008-12-01), Müller

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