Optical system for ceiling mounted passive infrared sensor

Details Optical system for ceiling mounted passive infrared sensor Optical system for ceiling mounted passive infrared sensor

1982-12-30

1985-04-30

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250338, 250353, G01J 508

Patent

active

045146314

ABSTRACT:
A ceiling mountable passive infrared intrusion detection system is disclosed having a mirror assembly providing a first protective curtain which is relatively narrow in the horizontal plane and which substantially encompasses the vertical space of a protected facility, and providing a second protective curtain which is relatively narrow in the vertical plane and which substantially encompasses 360.degree. of horizontal space of a protected facility. A temperature stabilized and shock insensitive infrared detector is disposed along the optical axis and at the focal point of the system to provide electrical signals in response to received radiation from the field of view of the protective curtains. The electrical signals are electronically processed to provide an output indication of intruder presence when in motion about both the floor area and the space between the floor area and the ceiling of a protected facility.

REFERENCES:
patent: 3036219 (1962-05-01), Thompson
patent: 3453432 (1969-07-01), McHenry
patent: 3524180 (1970-08-01), Cruse
patent: 3551676 (1970-12-01), Runnels
patent: 3631434 (1971-12-01), Schwartz
patent: 3703718 (1972-11-01), Berman
patent: 3886360 (1975-05-01), Reiss et al.
patent: 4375034 (1983-02-01), Guscott
patent: 4385833 (1983-05-01), Gardner

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