Electrically compensated sensor

Details Electrically compensated sensor Electrically compensated sensor

1974-05-06

1976-03-02

Queisser, Richard C.

Measuring and testing

Ductility or brittleness

73344, 73362CP, 73DIG4, 307 88ET, 310 86, G01B 716, G01K 700, H01G 702

Patent

active

039409740

ABSTRACT:
A sensing device that may be employed as a thermal or stress sensor includes in one embodiment a pair of poled electret 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 electret layers are used as stress sensors whereby piezoelectrically produced electrical signals are sensed and pyroelectric signals are operatively canceled.

REFERENCES:
patent: 2540194 (1951-02-01), Ellett
patent: 2769867 (1956-11-01), Crownover et al.
patent: 3233466 (1966-02-01), Shaw
patent: 3448348 (1969-06-01), Stadler
patent: 3453432 (1969-07-01), McHenry
patent: 3480777 (1969-11-01), Astheimer
patent: 3877308 (1975-04-01), Taylor
patent: R27354 (1972-05-01), Wiebe et al.

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