Optical smoke detector with sensitivity adjustment

Details Optical smoke detector with sensitivity adjustment Optical smoke detector with sensitivity adjustment

1982-11-03

1985-06-18

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340630, 356338, G08B 1710

Patent

active

045242810

ABSTRACT:
A smoke detector is disclosed containing a radiation source and a radiation receiver arranged externally of a direct radiation region of the radiation source. In the presence of smoke or other combustion particles in the radiation region the radiation receiver is impinged by scattered radiation. The smoke detector contains optical elements which can be altered by external mechanical actuation, by means of which it is possible to alter in a predetermined manner an output signal of the radiation receiver. In this regard it is possible to either mechanically alter the solid angle which is so-to-speak viewed by the radiation receiver or the solid angle irradiated by the radiation source. The constriction of the active solid angle is preferably accomplished by a diaphragm or membrane displaceable along the radiation direction. Displacement of the diagram is preferably achieved in that, this diaphragm engages by means of dogs or detents in a cam groove, such as a helical-shaped groove of a cam disk, and by rotating the cam disk there can be achieved a defined displacement of the diaphragm.

REFERENCES:
patent: 3985453 (1976-10-01), Nakano et al.
patent: 3992102 (1976-11-01), Kajii
patent: 4011458 (1977-03-01), Malinowski
patent: 4181439 (1980-01-01), Tresch et al.
patent: 4216377 (1980-08-01), Hasegawa et al.
patent: 4269510 (1981-05-01), Horvath et al.
patent: 4430646 (1984-02-01), Enemark

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