Optical arrangement for a light scattering type smoke detector

Details Optical arrangement for a light scattering type smoke detector Optical arrangement for a light scattering type smoke detector

1980-12-10

1983-08-09

Corbin, John K.

Optics: measuring and testing

By particle light scattering

With photocell detection

250574, G01N 2153

Patent

active

043975577

ABSTRACT:
An optical arrangement for a light scattering type smoke detector has a radiation transmitter and receiver which are each preceded by a lens for obtaining a generally parallel field of view for each of the transmitter and receiver. The radiation is directed at a detection zone which is surrounded by diaphragms and the fields of view for the transmitter and receiver terminate in a light trap for preventing unwanted scattering and reflection. The transmitter and receiver are disposed at an acute angle with respect to each other and the receiver detects only back-scattered radiation from smoke particles in the detection area. This structure allows a relatively short structural length to be utilized along a common optical axis of the transmitter and receiver.

REFERENCES:
patent: 3916209 (1975-10-01), Steele et al.
patent: 4103997 (1978-08-01), Araki et al.

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