Smoke detecting apparatus with a predetermined direction electri

Details Smoke detecting apparatus with a predetermined direction electri Smoke detecting apparatus with a predetermined direction electri

1998-06-30

2000-06-20

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340630, 356340, G01V 800

Patent

active

060780401

ABSTRACT:
A light source image, i.e., a near field pattern of the light-emitting face of a laser diode which emits laser light having the electric field component in a predetermined direction is formed by an imaging lens at an image forming position of a smoke detecting area through which a flow of sucked air passes. A light receiving device is disposed on an optical axis which passes through the image forming position of a light source image in the smoke detecting area and which is set in a plane that is substantially parallel to the direction of the electric field component of the laser light, and receives scattered light due to a smoke particle passing through the imaging position of the light source image and the vicinity of the imaging position.

REFERENCES:
patent: 3881112 (1975-04-01), Roberts
patent: 5319575 (1994-06-01), Lilienfield
patent: 5576697 (1996-11-01), Nagashima et al.

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