5. Airborne photoacoustic multi-gas detectors

5.1 Application to gases other than methane

Any gas absorbing in the IR is potentially detectable, and the detection limit obtained is directly linked to the absorption coefficient of the gas and the power of the laser emitting at the wavelength in question. Advances in medium-IR lasers open up a wide range of possibilities in terms of accessible gases. Table 2 shows the detection limits that have been or could be achieved for various gases, using near-IR laser diodes (DL: estimated power 10 mW) or quantum cascade lasers (QCL: estimated power 25 mW) in conjunction with the detector described above.

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Airborne photoacoustic multi-gas detectors

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page Application to methane gas detection

Conclusion

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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