G - Physics – 08 – B
Patent
G - Physics
08
B
340/124.4
G08B 13/18 (2006.01) G08B 13/19 (2006.01) G08B 13/193 (2006.01)
Patent
CA 1175525
ABSTRACT A passive infrared intrusion detection system having a mirror assembly providing a protective curtain which is relatively narrow in the horizontal plane and which substantially encompasses the vertical space of a protected facility. The mirror assembly includes a focusing mirror and at least one cylindrical mirror which is cooperative with-the focusing mirror to provide a relatively large field of view in the vertical plane and a relatively narrow field of view in the horizontal plane. An infrared detector is disposed along the optical axis of the focusing mirror and at the focus thereof to provide electrical signals in response to received radiation from the fields of view. The detector signals are electronically processed to provide an output indication of intruder presence.
381956
American District Telegraph Company
R. William Wray & Associates
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