G - Physics – 08 – B
Patent
G - Physics
08
B
340/77, 73/0.5
G08B 17/00 (2006.01) G01N 21/47 (2006.01) G08B 17/10 (2006.01) G08B 29/00 (2006.01)
Patent
CA 1119269
ABSTRACT A smoke detector of the photo-electric type having a photo-responsive device viewing a volume illuminated by a light beam, in which a test member is provided for being temporarily positioned in the light beam so that one side of said member is exposed to the light and the other side is in the view of the photo-responsive device. The last member has a light-transimtting area which is small in relation to the cross-sectional area of the light beam. In one embodiment of the invention the light-transmitting area is thin enough to be translucent, so that the translucent area illuminated by the beam simulates a predetermined percentage of smoke in the beam with a high degree of accuracy, since the transmission characteristics of the translucent area can be consistently maintained within production telerances, and the exact position of the translucent area in the light beam for the smoke simulation is not cri?. In another embodiment of the invention, a small hole is provided is the test member to pass a predetermined amount of light from one side of the thin area to the other.
317076
Doherty William F.
Malinowski William J.
Chloride Incorporated
Swabey Ogilvy Renault
LandOfFree
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