A photoacoustic cell is used to measure the absorptance of gases at infrared wavelengths. A pressure pulse is created when the gas absorbs a light pulse, exciting resonances within the cell. A microphone provides the cell's output signal whose energy is (ideally) proportional to the absorbed light energy. The paper describes a novel approach for processing the cell's noisy output.

Author: Michnovicz, Michael R.
Affiliation: TITAN / Spectron Development Labs, Albuquerque, NM
AES Convention: 91 (October 1991) Paper Number: 3154
Publication Date: October 1, 1991
Subject: Microphones

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