3. Gas detection
3.1 Photoacoustic signal
PA signal theory develops from acoustic variation in a gas and is described by an acoustic pressure p, to which we associate acoustic velocity u and acoustic temperature θ. The heat H produced by the absorption of light generates the acoustic signal. This can be described by the following equation:
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Gas detection
Application to methane gas detection
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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...
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