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ABSTRACT
Photoacoustic spectrometry (PAS) is the main subject of this article. This method allows for the reliable detection and analysis of toxic gases and pollutants. To begin with, the overall principle of this method is presented together with the history of the technique and modern photoacoustic spectrometry. The analysis of the gas detection process via noise detection, signal-to-noise ratio and signal improvement appears to be essential. The application to methane gas detection is also dealt with in this article.
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Virginie ZENINARI: Doctorate in physics from the University of Reims Champagne Ardenne (URCA) - Senior lecturer, authorized to direct research at the Reims Faculty of Natural Sciences (URCA)
INTRODUCTION
The principle of photoacoustic spectrometry (PAS) involves exciting a sample with modulated light of a defined wavelength. The molecules absorb part of the light energy, which they then convert into an acoustic signal that is picked up by a microphone. SPA is a highly stable and easy-to-use method, capable of detecting very low concentrations of gas, and highly efficient, especially at atmospheric pressure; the measurement dynamic extends over at least 5 orders of magnitude.
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Photoacoustic spectrometry
From photophone to photoacoustics
Manufacturers – Suppliers – Distributors
Omnisens Systems (Switzerland) http://www.omnisens.ch/
Omnisens trace gas analyzers combine photoacoustic spectrometry with an innovative, highly sensitive detection technique. This results in fast response times, low detection limits and operation without periodic recalibration. The TGA320-X device detects ammonia (NH 3 ) for applications...
Bibliography
Websites
University of Reims. http://www.univ-reims.fr/
Harvard University. http://cfa-www.harvard.edu/HITRAN/
Alpes lasers. http://www.alpeslasers.com/...
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