ADDRESSABLE DETECTOR WITH EXTERNAL SMOKE CHAMBER Russian patent published in 2011 - IPC G08B17/10 

FIELD: fire safety.

SUBSTANCE: addressable detector is proposed with an external smoke chamber, comprising a source of radiation, a radiation receiver and an optical element differing by the fact that the optical element is made in the form of a single convex lens comprising two optical parts: the first one and the second one, separated between each other along the axis of symmetry with a lightproof partition, on top the first and the second parts have flat faces almost along the entire diameter of the lens; values of refraction of both parts of the lens are selected as identical from each other and are chosen depending on the specified focus distance to controlled particles of smokescreen or pollution; angles of faces inclination are selected under the condition of partial internal reflection during contamination of both surfaces of the optical element, at the same time repeated reflection takes place, and beams from the source of radiation partially arrive to the source of radiation, in this mode there are no sources of smoke.

EFFECT: increased operating properties due to tightness of the body and the possibility to calibrate the detector, reduced error in smoke detection.

3 cl, 3 dwg