Light scattering smoke detectors

G - Physics – 08 – B

Patent

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Details

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

Patent

CA 2339170

A smoke detector is disclosed which includes a smoke chamber having an inlet through which smoke can enter the chamber. In the chamber there are two light sources, preferably LEDs, which radiate light at frequencies which are as widely spaced as possible. Blue and infrared LEDs are preferred as these have wavelengths of about 430 nm and 980 nm respectively. The chamber also has therein one or more photosensitive devices onto which light scattered by smoke particles in the chamber falls. There is a barrier between the light sources and the photosensitive device to prevent light travelling in a straight line from the sources to the photosensitive device. Embodiments are disclosed which have more than two light sources, more than one photosensitive device and more than one smoke chamber.

L'invention concerne un détecteur de fumée qui comprend une chambre à fumée comprenant une entrée à travers la fumée peut pénétrer dans la chambre. Cette chambre est équipée de deux source lumineuses, de préférence des DEL, qui émettent une lumière à des fréquences aussi espacées que possible. On utilisera de préférence des DEL bleues et infrarouges, ces dernières comprenant des longueurs d'ondes d'environ 430 nm et 980 nm respectivement. La chambre contient en outre un ou plusieurs dispositifs photosensibles qui reçoivent la lumière diffusée par les particules de fumée présentes dans la chambre. Une barrière entre les sources lumineuses et le dispositif photosensible empêche la lumière de passer en ligne droite des sources lumineuses aux dispositifs photosensibles. L'invention concerne également des formes d'exécution comprenant plus de deux sources lumineuses, plusieurs dispositifs photosensibles et plusieurs chambres à fumée.

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