Extinction type detector

Details Extinction type detector Extinction type detector

1987-03-31

1989-06-13

Rosenberger, Richard A.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

356435, 356223, G01N 2159

Patent

active

048386987

ABSTRACT:
An extinct type detector which detects and determines a concentration or density of a gas or vapor in a space on the basis of an attenuation of light due to the gas or vapor present within the space.
The detector of this feature of the invention operates in such a way that the light emitting device is periodically driven to effect light emission, the first and the second photodetector devices receive the light from said light emitting device, the first and second storage means corresponding to the first and the second photodetector devices, respectively, cumulatively store the outputs from the respective photodetector devices, a difference in cumulative storage values between the first and the second storage means is detected to determine a concentration and density of the gas or vapor within the detecting space based on the detected difference.

REFERENCES:
patent: 3528749 (1970-09-01), Bowker
patent: 3872315 (1975-03-01), Boll
patent: 3992113 (1976-11-01), Egli et al.
patent: 4119949 (1978-10-01), Lindgren
patent: 4308531 (1981-12-01), Yamamoto
patent: 4544273 (1985-10-01), Berndt
patent: 4649282 (1987-03-01), Ota et al.

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