Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-09-22
1990-12-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356439, G01N 2100
Patent
active
049805711
ABSTRACT:
Methods and apparatus for continuously and instantaneously measuring sidestream smoke are provided. A hood assembly is provided to fit over the ports of a conventional smoking machine. Sidestream smoke produced by test cigarettes is continuously drawn through the hood by an exhaust system. A laser beam is passed through the smoke one or more times before the beam is sensed by a photodiode detector. An electrical signal from the detector, representing the light transmission, is received by a strip recorder or computer system. The transmission measurements are used to calculate the extinction coefficient of the smoke for comparison purposes.
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Brown, Jr. Leonard E.
Comes Roger A.
Francis Bobby W.
Greene Randall K.
McRae Douglas D.
Beck George
deBlasi Gerard A.
Nelms David C.
Philip Morris Incorporated
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