Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1984-06-20
1986-10-14
Rosenberger, R. A.
Optics: measuring and testing
By particle light scattering
With photocell detection
250574, 340630, G01N 2153
Patent
active
046169288
ABSTRACT:
A photoelectric smoke detector including a housing defining a test zone and an opening for admitting smoke thereinto, a light source arranged to direct light to the zone and a light responsive element arranged to receive light scattered by smoke particles in the zone. An optical barrier prevents the direct transmission of light through the zone and between the light source and light responsive element, the barrier defining a light passage for transmitting light directly therebetween. Projecting into the light passage is a mechanical gate that can be adjusted to alter the size of the light passage and thereby vary the level of light transmitted directly therethrough between the light source and the light responsive element. In response to selective adjustment of the mechanical gate, the light responsive element can provide a background signal that obviates normal electronic noise.
REFERENCES:
patent: 3992102 (1976-11-01), Kajii
patent: 4216377 (1980-08-01), Masegawa et al.
patent: 4488049 (1984-12-01), Marsocci
Leavitt George E.
LoStracco Felice
Cooper Crystal
Jarcho Harold G.
Kidde, Inc.
Rosenberger R. A.
Toupal John E.
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