Opto-acoustic gas analyzer

Details Opto-acoustic gas analyzer Opto-acoustic gas analyzer

1978-12-04

1980-12-02

Corbin, John K.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

250343, 250351, G01N 2134

Patent

active

042368278

ABSTRACT:
An opto-acoustic gas analyzer has a black body light source, a chopper in the path of the light emitted from the light source for intermittently intercepting the light from the light source, a positive interference filter in the path of the light for filtering out light other than the wavelengths of light absorbed by the gas being analyzed, and an opto-acoustic detector which receives the filtered light and through which the gas to be analyzed is passed. A pressure change detector provided is provided in the opto-acoustic detector for detecting pressure changes in the gas and producing an electric signal corresponding such changes.

REFERENCES:
patent: 3723731 (1973-03-01), Blau
patent: 3820901 (1974-06-01), Kreuzer
patent: 3947685 (1976-03-01), Meinel
patent: 4055764 (1977-10-01), Dimeff
Delany, M. E., "The Opto-Acoustic Effect in Gases," Science Progress, vol. XLVII, No. 187, Jul. 1959, pp. 459-467.

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