Light scattering type smoke detector

Details Light scattering type smoke detector Light scattering type smoke detector

G - Physics

01

N

340/140.1

G01N 21/01 (2006.01) G01N 21/53 (2006.01) G08B 17/10 (2006.01) G08B 17/107 (2006.01)

Patent

CA 1064139

LIGHT SCATTERING TYPE SMOKE DETECTOR Abstract of the Disclosure A light scattering type smoke detector effectively sensitive both to white and black smokes is provided. A wave length .lambda. of an incident light from a light source and a scattered light receiving angle .theta. defined by the direction of the incident light and the direction connecting between a smoke particle and alight receiving element are so determined as to satisfy .lambda. ? 950 mµ when .theta. ? 45°, .theta. ? - 0.18 .lambda. + 216 when 45° ? .theta. ? 135° and .theta. ? 135° when .lambda. ? 450 mµ.

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