Segmented optical system for an alarm system

Details Segmented optical system for an alarm system Segmented optical system for an alarm system

1984-12-12

1986-10-14

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250338R, 350616, G01J 100

Patent

active

046174630

ABSTRACT:
A segmented optical system for use in an alarm system. A plurality of optical elements such as mirrors are arranged so that each of them directs radiation from a predetermined direction towards a common focal point. Each optical element defines a respective discrete field of view to a detector at the focal point, adjacent fields of view overlapping so that an object moving from within one field of view towards an adjacent field of view enters an area which is common to the two adjacent fields of view. There is thus a stepwise change in the intensity of radiation reaching the detector from a single source when that single source crosses the boundary of a field of view and yet there is no space between adjacent fields of view from which no radiation can be received by the detector.

REFERENCES:
patent: 3703718 (1972-11-01), Berman
patent: 3958118 (1976-05-01), Schwarz
patent: 4263585 (1981-04-01), Schaefer
patent: 4321594 (1982-03-01), Galvin et al.

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