IR intrusion detector using scattering to prevent false alarms

Details IR intrusion detector using scattering to prevent false alarms IR intrusion detector using scattering to prevent false alarms

1994-03-23

1995-06-13

Swann, Glen

Communications: electrical

Condition responsive indicating system

Specific condition

2503383, 250340, 340600, G08B 13191

Patent

active

054247187

ABSTRACT:
An infrared intrusion detector uses infrared-sensitive sensors with pyroelectric sensor elements for detecting infrared radiation from a spatial region to be monitored. Infrared radiation passes through an entrance window and reaches the sensor elements via focusing mirrors. Extraneous radiation, outside the useful radiation band, is eliminated by filtering at the entrance window and by an optical transmission filter, and by scattering at suitable rough surfaces of the focusing mirrors. As a result, the infrared intrusion detector is less sensitive to extraneous radiation and less likely to produce false alarms.

REFERENCES:
patent: B13703718 (1982-04-01), Berman
patent: 4307388 (1981-12-01), Doenges et al.
patent: 4321594 (1982-03-01), Galvin et al.
patent: 4342987 (1982-08-01), Rossin
patent: 5055685 (1991-10-01), Sugimoto et al.

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