Passive infrared intrusion detection system

Details Passive infrared intrusion detection system Passive infrared intrusion detection system

1980-07-28

1983-02-22

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250353, 340567, 340573, G01J 100

Patent

active

043750346

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.

REFERENCES:
patent: 3036219 (1962-05-01), Thompson
patent: 3524180 (1970-08-01), Cruse
patent: 3631434 (1971-12-01), Schwartz
patent: 3703718 (1972-11-01), Berman
patent: 3886360 (1975-05-01), Reiss et al.
patent: 3886360 (1975-05-01), Reiss et al.
patent: 4238675 (1980-12-01), Turlej et al.
patent: 4271359 (1981-06-01), Herwig et al.

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