Particle detection which senses scattered light

Details Particle detection which senses scattered light Particle detection which senses scattered light

1991-06-21

1993-07-27

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340628, 250574, 356338, G08B 1710

Patent

active

052313786

ABSTRACT:
A high sensitivity smoke detector comprises a cylindrical housing incorporating a sampling chamber through which air to be sampled is forced. A modulated light source, such as a laser, directs modulated light through the chamber to a beam dump. The light beam is offset from the axis of the housing by an acute angle of between 15 and 50 degrees. If any smoke particles are positioned within a sampling volume, the light is scattered along a path defined by baffles to an axially positioned light sensor whose electrical output is passed through a phase-sensitive detection circuit which is referenced by the frequency at which the light source is modulated, so as to produce an output dependent on the light scattered by the smoke particles.

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patent: 4857895 (1989-08-01), Kaprelian
patent: 4870394 (1989-09-01), Corl et al.
patent: 4874242 (1989-10-01), Bezard et al.

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