Infrared intrusion detector with a plurality of infrared ray det

Details Infrared intrusion detector with a plurality of infrared ray det Infrared intrusion detector with a plurality of infrared ray det

1988-09-23

1990-03-27

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250342, 340567, G01J 518, G08B 1318

Patent

active

049127489

ABSTRACT:
A personal body detecting device makes it possible to determine the presence and absence of a personal body in a detecting zone by sensing infrared rays in the zone with a plurality of infrared ray detecting elements, detecting at a discriminating means a peak level and output time in connection with respective outputs of the infrared ray detecting elements, and comparing them with each other. The personal body having reached the detecting zone in any direction thereto can be reliably detected, and a highly reliable detecting operation can be realized.

REFERENCES:
patent: 4614938 (1986-09-01), Weitman
patent: 4618854 (1986-10-01), Miyake et al.
patent: 4697081 (1987-09-01), Baker
patent: 4704533 (1987-11-01), Rose et al.
patent: 4746910 (1988-05-01), Pfister et al.

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