Smoke detector with test means for simulating a predetermined pe

Details Smoke detector with test means for simulating a predetermined pe Smoke detector with test means for simulating a predetermined pe

1977-11-29

1979-03-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340515, G01N 2126

Patent

active

041444590

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 test member has a translucent area at the forward edge which is small in relation to the cross-sectional area of the light beam. The translucent area illuminated by the beam simulates a pre-determined 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 tolerances, and the exact position of the translucent area in the light beam for the smoke simulation is not critical.

REFERENCES:
patent: 3868184 (1975-02-01), Marsocci
patent: 4053785 (1977-10-01), Lee et al.

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