Pyroelectric temperature compensated sensing device employing di

Details Pyroelectric temperature compensated sensing device employing di Pyroelectric temperature compensated sensing device employing di

1975-08-08

1976-12-21

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, G01J 100

Patent

active

039990699

ABSTRACT:
A temperature compensated sensing device for sensing a particular condition includes first and second conductive layers in surface-to-surface contact with and separated by a layer of poled, pyroelectric material. In a preferred embodiment, the second conductive layer is electrically grounded and the first conductive layer is etched to define two interdigitated, electrically unconnected sets of conductive portions. The sets of conductive portions are heated when exposed to the condition desired to be detected and, in turn, heat areas of the pyroelectric layer. As a result, electrostatic charges are developed on the heated pyroelectric areas and appear as voltage potentials on the heated conductive portions. Electronic circuitry having a differential amplifier is electrically connected to the conductive portions for sensing the voltage potentials thereon and for triggering an alarm when certain voltage potentials exist. In a first modified embodiment, the first conductive layer is electrically grounded and the second conductive layer contains the interdigitated conductive portions, and in a second modified embodiment neither of the conductive layers is grounded.

REFERENCES:
patent: 3839640 (1974-10-01), Rossin
patent: 3896311 (1975-07-01), Taylor et al.

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