Piezoelectric pressure sensor having tubular charge detecting un

Details Piezoelectric pressure sensor having tubular charge detecting un Piezoelectric pressure sensor having tubular charge detecting un

1993-09-10

1995-01-03

Goldstein, Herbert

Measuring and testing

Fluid pressure gauge

Diaphragm

73708, 73745, 29 2535, C01L 908

Patent

active

053775473

ABSTRACT:
A piezoelectric pressure sensor includes a generally elongated sensor housing, a pressure receiving plate disposed at a first end of the sensor housing with a first surface thereof serving as a pressure receiving surface for receiving a pressure applied from outside of the sensor housing, a pressure transmission member accommodated in the sensor housing with a first end thereof held in contact with a second surface of the pressure receiving plate, and a tubular piezoelectric element accommodated in the sensor housing with a first end thereof held in contact with a second end of the pressure transmission member. A pair of electrodes are formed on the external and internal surfaces of the piezoelectric element, respectively. An external charge detection member is held in contact with the external electrode for collecting charge generated by the external electrode and is encircled by a heat-shrinkable tube, while an internal charge detection member is held in contact with the internal electrode for extracting charge therefrom. A fixing screw is threaded into the sensor housing for holding in a prestressed fashion the piezoelectric element and the pressure transmission member against the pressure receiving plate. During assemblage of the pressure sensor, the heat-shrinkable tube undergoes a thermal shrinkage upon application of heat thereto, thereby compressing the external charge detection member radially inwardly against the external electrode.

REFERENCES:
patent: 3672223 (1972-06-01), Spescha
patent: 3879174 (1975-04-01), Uhl et al.
patent: 4530138 (1985-07-01), Ritter
patent: 5138885 (1992-08-01), Okauchi et al.
patent: 5142914 (1992-09-01), Kusokabe et al.
Hiroki Kusakabe et al., "A Cylinder Pressure Sensor for Internal Combustion Engine", SAE Technical Paper Series 920701, (1992) pp. 119-124.

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