Low impedance, high current pressure transducer

Details Low impedance, high current pressure transducer Low impedance, high current pressure transducer

1976-05-04

1978-01-03

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

338 4, 73730, G01L 906

Patent

active

040659690

ABSTRACT:
An apparatus is provided for determining the internal pressure of a fluid conduit in line with which the apparatus is inserted. Fluids transported through the conduit are caused to pass through a thin-walled inner tubular member which expands and contracts in response to increases and decreases in fluid pressure. Surrounding the thin-walled conduit is a layer of piezo-conductive material which is in turn surrounded by a snugly fitting, relatively inelastic outer tube. Pressure inside the thin-walled inner conduit causes the piezo-conductive material to be compressed between the thin-walled conduit and the outer inelastic tube thereby producing a change in the conductance of the piezo-conductive material. A conductance analog of pressure is thereby produced between electrodes attached to the thin-walled inner conduit and the inelastic outer tube. The device may be rendered in very high current, low conductance forms for use in direct modulation of high current circuits.

REFERENCES:
patent: 3242449 (1966-03-01), Stedman
patent: 3937087 (1976-02-01), Heggie

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