Photoacoustic gas analyzer

Details Photoacoustic gas analyzer Photoacoustic gas analyzer

1987-05-20

1989-04-04

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

356432, G01N 2100

Patent

active

048188824

ABSTRACT:
A photoacoustic gas analyzer comprising a measuring chamber, a modulated light source, and at least one microphone in connection with the measuring chamber and measuring the changes of pressure caused by the absorption of the light in the chamber. The measuring chamber comprises an inner surface with a reflecting coating. The measuring signal is thereby proportional to the gas concentration and is not provided as the difference between two almost equal values. As a result it is possible to measure small gas concentrations provided the light intensity within the measuring chamber suffices.

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Goldan et al., "An Acoustically Resonant System for Detection of Low-Level Infrared Absorption in Atmospheric Pollutants," Journal of Applied Physics, vol. 45, No. 10 (10/74).
"Air Pollution: Sensitive Detection of Ten Pollutant Gases by Carbon Monoxide and Carbon Dioxide Lasers," Science vol. 177, pp. 347-349, (Jul. 28, 1972).

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