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.
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https://aes2.org/publications/elibrary-page/?id=5562
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