Motion detector for space surveillance

Details Motion detector for space surveillance Motion detector for space surveillance

1982-05-17

1984-10-23

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250353, G01J 508

Patent

active

044790562

ABSTRACT:
A motion detector responsive for infrared radiation, e.g. to use in burglar-alarm installations, comprises an elongate frustopyramidal box with an entrance opening at one end, a concave mirror at the opposite end and four flat, internally reflecting longitudinal walls, two of them converging toward the entrance end on opposite sides of a plane of symmetry with which they include an angle between about 8.degree. and 15.degree.. A pyroelectric radiation sensor near the entrance end, lying in the vicinity of the focal point of the concave mirror, is disposed for illumination by beams of parallel rays in a limited number of fields of view; these beams approach the entrance end at different azimuthal angles, included with the preferably vertical plane of symmetry, but occupy closely adjoining regions inside the box. A planar deflector at the entrance end, bisected by the plane of symmetry, also establishes a limited number of elevational angles for the beams focused upon the radiation sensor.

REFERENCES:
patent: 3864566 (1975-02-01), Simpson et al.
patent: 3923382 (1975-12-01), Harding
patent: 3958118 (1976-05-01), Schwarz
patent: 4087688 (1978-05-01), Keller
patent: 4268752 (1981-05-01), Herwig et al.
patent: 4385833 (1983-05-01), Gardner

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