Pressure sensitive capacitance sensing element

Details Pressure sensitive capacitance sensing element Pressure sensitive capacitance sensing element

G - Physics

01

L

73/3, 340/41, 32

G01L 9/12 (2006.01) G01L 9/00 (2006.01)

Patent

CA 1036832

Abstract of the Disclosure A diaphragm element includes thin outer conducting layers integrally bonded to the opposite sides of a core layer of silicone or other dielectric which is a resilient, flexible material, to form a single, integral, resilient, flexible structure. The conducting layers are a matrix of the material of the dielectric core layer with carbon or like conductive particles embedded therein. One conducting layer is spaced peripherally from the edge of the core layer to thereby pre- vent electrical contact between the two conducting layers. The total unit is rigidly mounted about the peripheral edge with metallic contacts connected to the conducting layers as by a silver conducting paint applied to the outer surface of the layers. The element will thus flex to the side of the lower pressure with a change in the effective conducting area of the opposite conducting layers and a simultaneous decrease in the thickness of the dielectric inner core. Consequently, the capacitance of the unit varies as a func- tion of the deflection and thereby in accordance with the pressure differential applied across the diaphragm element.

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