Intrusion detection devices employing multiple scan zones

Details Intrusion detection devices employing multiple scan zones Intrusion detection devices employing multiple scan zones

1975-02-03

1976-05-18

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250209, 340258B, G01D 2104

Patent

active

039581187

ABSTRACT:
This invention relates to intrusion detection devices, and in one embodiment includes an array of infra-red detectors with associated means for selectively increasing the number of scan zones which may be monitored by the same detector array, by providing an optical system with reflectors and/or lenses having a multiplicity of facets set at selected angles to direct primary impulses received from portions of the entire scanned field sequentially to the detector array.

REFERENCES:
patent: 3260849 (1966-07-01), Polye
patent: 3551683 (1970-12-01), Tothill
patent: 3638019 (1972-01-01), Desvignes et al.
patent: 3723738 (1973-03-01), Brenner et al.
patent: 3824392 (1974-07-01), Tibbling
patent: 3864566 (1975-02-01), Simpson et al.

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