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Theoretical Analysis of Photoacoustic Signal on PAS Using a Transparent Transducer

We proposed a new theoretical model for photoacoustic spectroscopy (PAS) using a transparent transducer. Based on the Jackson and Amer model, this takes into account not only a very small air gap as thermal resistance between the sample and the transducer but also the transducer displacement due to its own temperature distribution. It is shown that the theoretical calculations based on our model are more consistent with the experimental data for both PA amplitude and phase signals of GaAs than the conventional model. From these results, the validity of our theoretical model is verified experimentally.