System and method for gas analysis using photoacoustic...

Measuring and testing – Gas analysis – By vibration

Reexamination Certificate

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C073S024020

Reexamination Certificate

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11485129

ABSTRACT:
A method for analyzing a target analyte gas concentration using a photoacoustic spectroscopy cell comprising:i) a modulatable light source which provides optical radiation at an absorption wavelength of a target analyte;ii) a resonant acoustic chamber for containing said analyte;iii) a microphone positioned within said chamber whereby the acoustic reactance of the microphone is substantially equal but opposite in value to the acoustic reactance of the chamber at a selected cell resonance frequency.

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