Laser photoacoustic spectroscopy: a powerful tool for trace gas measurements

D. C. Dumitras

doi:10.1117/12.2316014

1 September 1996 Laser photoacoustic spectroscopy: a powerful tool for trace gas measurements

D. C. Dumitras

Proceedings Volume 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology; 277891 (1996) https://doi.org/10.1117/12.2316014
Event: 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 1996, Taejon, Korea, Republic of

Abstract

Laser photoacoustic spectroscopy (LPAS) is one of the most sensitive calorimetric techniques that consists in energy conversion from modulated excitation radiation (laser) to sound energy and it is due to nonradiative transitions that convert a part of absorbed energy into thermal energy. The temperature variations then determine the formation of acoustic waves. At the wavelengths of the CO₂ laser (9-11 μm), more than two hundred of molecular gases can be detected with a system based on photoacoustic (PA) spectroscopy, at concentrations as low as ppb or even ppt.

Citation Download Citation

D. C. Dumitras "Laser photoacoustic spectroscopy: a powerful tool for trace gas measurements", Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 277891 (1 September 1996); https://doi.org/10.1117/12.2316014

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