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:

\nabla^{2} p - \frac{1 \partial^{2} p}{c_{0}^{2} \partial t^{2}} = - [\frac{(γ - 1)}{c_{0}^{2}}] \frac{\partial H}{\partial t}

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Gas detection

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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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