Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1984-12-11
1986-11-25
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250342, 350627, G01J 508
Patent
active
046251154
ABSTRACT:
The ceiling mountable passive infrared intrusion detection system of the present invention includes a focusing mirror having an optical axis, and a composite field-forming mirror cooperative with the focusing mirror for providing both a plurality of vertical curtains and a plurality of uniform detection sensitivity finger beams defining fields of view in selected azimuthally spaced relation through which an intruder must pass when in motion about the floor of a protected facility. The composite field-forming mirror includes first and second pluralities of selectively-twisted cylindrical facets defining longitudinal axes that individually intersect the optical axis of the focusing mirror at preselected different non-zero acute angles and provide corresponding ones of the selectively azimuthally spaced fields of view of the vertical curtains. The composite field-forming mirror includes a third plurality of planar facets having normals that are orthogonal to corresponding ones of the longitudinal axes of the selectively-twisted cylindrical facets to provide the fields of view of the finger beams. The composite field-forming mirror defines an effectively continuous optical aperture.
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patent: 4385833 (1983-05-01), Gardner
patent: 4442359 (1984-04-01), Lederer
American District Telegraph Company
Fields Carolyn E.
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