optoacoustic detection method

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optoacoustic detection method [¦äp·tō·ə¦küs·tik di′tek·shən ‚meth·əd]

(analytical chemistry)

A method of detecting trace inpurities in a gas, in which the absorption of a sample of the gas at various light frequencies is measured by directing a periodically interrupted laser beam through the sample in a spectrophone and measuring the sound generated by the optoacoustic effect at the frequency of interruption of the beam.

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