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2. Overall principle
2.1 History of the technique
The photoacoustic (PA) effect, in both gaseous and non-gaseous matter, was discovered in the 19th century and, in 1880, Bell briefly reported the accidental discovery of the PA effect in solids. During his experiments with the photophone, Bell discovered that it was possible to obtain a directly audible signal. He demonstrated that the PA effect in solids depended on the absorption of light, and that the strength of the acoustic signal depended on the power absorbed. Bell thus correctly deduced the intrinsic optical dependence of absorption on the PA effect. In addition to studying the PA effect in solids, Bell also worked on the PA effect in liquids and gases. He observed that...
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Overall principle
Gas detection
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/...
Theses
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