Optical particle detector

Details Optical particle detector Optical particle detector

1978-09-11

1980-10-07

Corbin, John K.

Optics: measuring and testing

By particle light scattering

With photocell detection

250574, 340630, G08B 1710

Patent

active

042265339

ABSTRACT:
An optical particle detector is disclosed using a dark field optical system in which an air sample is illuminated and forward scattered light is collected in a zone centered about but excluding on-axis light. The collected light is then sensed to detect the presence of air borne light scattering particles. Particles of greatest interest are smoke particles. The system includes a self-contained light source and a photo detector suitable for operation by a dry cell. The optics are designed for high light gathering efficiency consistent with minimum space requirements and the internal design minimizes scattered light to achieve maximum smoke detection sensitivity.

REFERENCES:
patent: 3361030 (1968-01-01), Goldberg
patent: 3368078 (1968-02-01), Fliut et al.
patent: 3431423 (1969-03-01), Keller
patent: 3630617 (1971-12-01), Marrett

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