Piezoelectric pressure sensor and method of assembling same

Details Piezoelectric pressure sensor and method of assembling same Piezoelectric pressure sensor and method of assembling same

G - Physics

01

L

G01L 23/10 (2006.01) G01L 9/00 (2006.01)

Patent

CA 2105752

A piezoelectric pressure sensor includes a generally elongate housing, a pressure receiving plate at a first end of the housing with first surface arranged to receive a pressure applied from outside the housing, a pressure transmission member in the housing with a first end in contact with a second surface of the pressure receiving plate, and a tubular piezoelectric element in the housing with a first end 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. An external member is in contact with the external electrode for collecting a charge on the external electrode and is encircled by a heat- shrinkable tube, while an internal member is in contact with the internal electrode for extracting a charge therefrom. A screw is threaded into the housing for holding the piezo- electric element and the pressure transmission member against the pressure receiving plate. During assembly of the sensor, the heat-shrinkable tube undergoes thermal shrinkage upon application of heat thereto, thereby compressing the external member radially inwardly against the external electrode.

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