Motion detector

Details Motion detector Motion detector

1986-11-26

1988-09-06

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, 340567, G01J 508, G01J 510

Patent

active

047695455

ABSTRACT:
A miniature passive infrared motion detector consists of an optical system, a pyroelectric polymer film and an electronic circuit. The optical system is made of a curved Fresnel lens and an elongated wave guide having a reflective inner surface. The polymer film is also curved with the same radius as the lens and has two interdigitized electrodes on the rear surface and one uniform electrode on the front surface. The front electrode is covered with infrared absorbent material. The electronic circuit contains a differential amplifier and a threshold detector.

REFERENCES:
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patent: 3760399 (1973-09-01), Schwarz
patent: 3809920 (1974-05-01), Cohen et al.
patent: 3839640 (1974-10-01), Rossin
patent: 3842276 (1974-10-01), Southgate
patent: 3958118 (1976-05-01), Schwarz
patent: 4052616 (1977-10-01), Keller
patent: 4052716 (1977-10-01), Mortensen
patent: 4225786 (1980-09-01), Perlman
patent: 4321594 (1982-03-01), Galvin et al.
patent: 4379971 (1983-04-01), Smith et al.
patent: 4670655 (1987-06-01), Zierhut
W. R. Blevin and Jon Geist, "Influence of Black Coatings on Pyroelectric Detectors", Applied Optics, vol. 13, No. 5 (May 1974), pp. 1171-1178.

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