Photoelectric smoke detector

Details Photoelectric smoke detector Photoelectric smoke detector

G - Physics

08

B

340/140.1

G08B 17/10 (2006.01)

Patent

CA 1254970

ABSTRACT A photoelectric smoke detector equipped with a light emitter which radiates light into a measuring space and a light receiver which detects scattered light caused by entry of smoke into the measuring space. A dark chamber which forms the above space has a front wall with a plane or curved surface which is arranged in front of the light emitter so that the light from the light emitter is reflected at a predetermined angle to the optical axis and side walls which are arranged nearly in parallel with the optical axis. A rear wall may also be provided which has a plane or curved surface and arranged in the rear of the light emitter so as to reflect the reflected light from the side walls at such an angle that the reflected light does not directly irradiate the light receiver. The above walls preferably have mirror-like surfaces with good absorbance.

489719

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