4. Application to methane gas detection

4.1 About methane

Methane detection has always been an interesting subject. In the past, its detection was necessary, in mines, to prevent firedamp. The detection of CH ₄ has been the subject of numerous patent applications. Today, almost all commercial methane detectors are based on flame ionization. The technique is relatively simple: during normal combustion, a stable proportion of CH ₄ molecules (around 0.0002%) temporarily ionize into the carbon ion C ⁺ and electrons e ^– . The flame produces the energy for this ionization. This phenomenon has a very short lifetime, and the charged components quickly...

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Application to methane gas detection

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Airborne photoacoustic multi-gas detectors

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

PAO (Y. H.) (Ed.) - Optoacoustic Spectoscopy and Detection - . Academic Press, New York (1977).
ROSENCWAIG (A.) - Photoacoustics and Photoacoustic Spectroscopy - . Wiley Interscience, New York (1980).
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Websites

University of Reims. http://www.univ-reims.fr/

Harvard University. http://cfa-www.harvard.edu/HITRAN/

Alpes lasers. http://www.alpeslasers.com/...

Theses

LePOUTRE (F.) - Étude de la relaxation collisionnelle de vibration par la méthode photoacoustique. Application à CH ₄ et à CO ₂ entre 150 et 400 K - , Thèse de doctorat d'état, université de Paris-Sud, Centre d'Orsay, France (1979).
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