Intrusion detector

Details Intrusion detector Intrusion detector

1996-01-18

1998-01-27

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

359566, 359568, 359569, G08B 1318

Patent

active

057126224

ABSTRACT:
An infrared detector including a sensor which provides an output signal responsive to infrared radiation incident on a face thereof, and a diffractive optical element which directs a substantial portion of incident visible radiation away from the sensor and which has substantially no diffractive effect on incident infrared radiation.

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