Optically biased smoke detector

Details Optically biased smoke detector Optically biased smoke detector

1976-11-04

1978-10-17

Mullins, James B.

Communications: electrical

Condition responsive indicating system

Specific condition

356207, 250574, G01N 2126

Patent

active

041211103

ABSTRACT:
An optical smoke detector for pulsed or continuous operation in which optical biasing of a light source and receiving transducer is employed to permit operation of the detector at points of greater sensitivity, stability and linearity than are found at low light levels. The optical biasing may be provided by a light-scattering optical integrator associated with the light source causing controlled impingement of light upon the field of view of the receiving transducer. Adjustment of the relative positions of the light source and transducer and of the disposition of a barrier between those elements as well as the holders of those elements provides further control of the optical biasing. The housing of the detector is provided with smoothly contoured passages for the unimpeded passage of smoke particles to an internal optical detection chamber.

REFERENCES:
patent: 3916209 (1975-10-01), Steele et al.
patent: 3992102 (1976-11-01), Kajii

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