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Article | REF: P2890 V1

Photoacoustic spectrometry - Application to gas analysis

Author: Virginie ZENINARI

Publication date: March 10, 2007

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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:

∇2p−1∂2pc02∂  t2=−[(γ−1)c02]∂H∂t

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