Passive target detector

Details Passive target detector Passive target detector

1983-11-07

1986-09-30

Buczinski, S. C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 4, G01C 300, G01C 308

Patent

active

046144269

ABSTRACT:
Passive target detectors which employ infra-red sensors may have difficulty in distinguishing between a cool target near the detector and a warmer one further away.
A detector detects a source of infra-red radiation and if its size indicates that it may be of interest, a point source detector operates a gate to allow information regarding the direction of the target to be transmitted to a store and to a calculator.
This information is combined in the calculator with stored directional information from the previous scan to give the range of the source. The real intensity of the source is then calculated from its range and apparent intensity. If the real intensity indicates that the target is of interest, an alarm or other indication may be operated.

REFERENCES:
patent: 2878711 (1959-03-01), Blackstone
patent: 3320615 (1967-05-01), Albright et al.
patent: 3378842 (1968-04-01), Phillips
patent: 3594556 (1971-07-01), Edwards
patent: 3644043 (1972-02-01), Jones et al.
patent: 3953667 (1976-04-01), Layton et al.
patent: 3982246 (1976-09-01), Lubar
patent: 4094225 (1978-06-01), Greenwood
patent: 4174177 (1979-11-01), Gardner et al.
patent: 4355984 (1982-10-01), Maeda
patent: 4497065 (1985-01-01), Tisdale et al.

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