Narrow band optical radiation sensor using pyroelectric material

Details Narrow band optical radiation sensor using pyroelectric material Narrow band optical radiation sensor using pyroelectric material

1997-09-22

1999-07-13

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250332, 2503382, G01J 512

Patent

active

059230290

ABSTRACT:
A pair of interleaved finger-like electrodes are positioned over a pyro-electric sheet of polyvinylidine fluoride and a pair of coatings are formed upon the electrodes having different optical reflectance, and as a result, a light beam energy absorption differential will be produced between the coatings and the resulting change in temperature in the sheet material under the electrodes will cause a voltage to be generated. A differential amplifier is connected across the electrodes to sense this voltage, indicative of the detection of an incoming laser light beam. A light chopper is positioned to interrupt the light beam directed at a portion of the pyro-electric sheet.

REFERENCES:
patent: 4379971 (1983-04-01), Smith et al.
patent: 4906849 (1990-03-01), Duo et al.
patent: 5030827 (1991-07-01), Powell
patent: 5746930 (1998-05-01), Belcher et al.

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