Electrically compensated sensor

Details Electrically compensated sensor Electrically compensated sensor

H - Electricity

01

G

356/95, 349/59.2

H01G 7/02 (2006.01) G11B 7/02 (1980.01)

Patent

CA 1056069

ABSTRACT A sensing device that may be employed as a thermal or stress sensor includes in one embodiment a pair of poled electrat layers as sensing mediums for detecting variations in the ambient temperature of the sensor. The electret layers of such embodiment have pyroelectric and piezoelectric properties, but only pyroelectrically produced electrical signals are used for sensing and piezoelectrically produced signals due to bending are effectively negated. In another embodiment, the electrat layers are used as stress sensors whereby piezoelectrically produced electrical signals are sensed and pyroelectric signals are operatively cancelled.

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