Abstract
Photoacoustic spectroscopy (PAS) using a transparent transducer LiNbO3 detects not only thermoelastic waves but also thermal waves because LiNbO3 has pyroelectricity as well as piezoelectricity. Then, we investigated the influence of the piezoelectric and pyroelectric effects on PA signal theoretically and experimentally, using three kinds of transparent transducers, Y-, 128° rotated Y- and Z-cut LiNbO3's. It was found that the pyroelectric effect predominates over the signal of the transducer more than the piezoelectric effect when the incident direction of an excitation light was toward to the transducer.
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