Light scattering smoke detector having conical and concave surfa

Details Light scattering smoke detector having conical and concave surfa Light scattering smoke detector having conical and concave surfa

1986-05-07

1988-03-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340630, G01N 1506

Patent

active

047288019

ABSTRACT:
Light-scatter smoke detector, depending from the ceiling of a room, has a base unit with a battery to power an infra-red light source and infra-red light sensor, both of which are located in an upper element. A lower element has a surface corresponding to the exterior of a cone, and forming the base of a chamber. A surface makes, with a frusto-conical surface of the upper element, an annular wedge-shaped recess to chamber, this recess facing both source and sensor. The surfaces have a matt-black coating to promote energy absorption, so that the recess inhibits any light entering it from ever re-emerging. The stream of air flowing through the detector is monitored in the central chamber for the presence of smoke particles, by the sensor watching for light which originated from the source being scattered by smoke particles in the chamber and arriving at the sensor.

REFERENCES:
patent: 4099178 (1978-07-01), Ranney et al.
patent: 4216377 (1980-08-01), Hasegawa et al.
patent: 4300133 (1981-11-01), Solomon
patent: 4596465 (1986-06-01), Nagashima

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