Pressure transducer with conductive polymer bridge

Details Pressure transducer with conductive polymer bridge Pressure transducer with conductive polymer bridge

G - Physics

01

L

73/70

G01L 9/04 (2006.01) G01L 1/22 (2006.01) G01L 9/00 (2006.01)

Patent

CA 1313060

Abstract of the Disclosure A pressure transducer is produced by molding a diaphragm from a high temperature thermoplastic. The diaphragm is molded in a cup shape having thick edges and a thin, flexible central portion onto which the strain gauge is to be formed. A Wheatstone bridge of conductive polymers is screen printed onto the surface of the thin central diaphragm of the molded element. The conductive polymers can be trimmed to a desired resistance value using a Nd-YAG laser or abrasive-type trimmers. The conductive polymers are baked onto the substrate and metal conductors are printed on the surface of the substrate at the ends of the resistor elements. These metal conductors are connected by a conductive epoxy to lead wires by which the sensor is connected into its monitoring circuit.

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