Apparatus for sequential measurement of light transmitted throug

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

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Details

250233, 356207, 356205, 340 237S, G01D 536, G01N 2126

Patent

active

040217132

ABSTRACT:
An apparatus for continuous and sequential measurement of amounts of reflected, diffused and directly transmitted light transmitted through smoke. The apparatus has a smoke chamber having a smoke introduction port and a smoke discharge port, and further has an aperture in one wall thereof. A first light source is aligned with the aperture, and a first sector member having an aperture therein.
A light receiving device is disposed on another wall of the smoke chamber opposite the aperture in the one wall, and a light measuring circuit is coupled to the light receiving device.
A second light source in the smoke chamber is directed toward the aperture in the one wall to strike the first sector member at an angle to the surface thereof, and a second sector member is rotatably mounted in the smoke chamber for movement between the second light source and the aperture in the one wall and has an aperture therein for alignment with the second light source. Sector member driving means connected to the sector members drives them in synchronization for aligning the aperture in the second sector member with the second light source when white reflection and black reflection portions of the first sector member are aligned with the aperture in the one wall, and for aligning the remainder of the second sector member with the second light source when the aperture in the first sector member is aligned with the first light source and the aperture in the one wall.

REFERENCES:
patent: 2877453 (1959-03-01), Mendenhall, Jr.
patent: 3885162 (1975-05-01), Geertz
patent: 3897154 (1975-07-01), Hawes

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