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1996•17th Congress of the International Commission for Optics: Optics for Science and New TechnologyRequires access

Laser photoacoustic spectroscopy: a powerful tool for trace gas measurements

Dan Dumitraş

Open publisher page 2 citations

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.

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What this paper is about

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.

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Available 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.

Key concepts: Photoacoustic spectroscopy, Laser, Spectroscopy, Photoacoustic effect, Excitation, Materials science, Wavelength, Radiation

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