Abstract
In this paper, we propose a new one-dimensional model to analyze a photopyroelectric signal of optically opaque materials measured by a polyvinylidene difluoride (PVDF) film sensor. This model is considered three layers (sample, air gap and the PVDF film) and the reflections of the thermal wave at the interfaces of each layer. In order to check the validity of the proposed model, we measure the inclination of the frequency dependence of the signal measured by the PVDF film and compare it with a theoretical value. When laser light is irradiated onto a graphite surface on the PVDF film, the measured inclinations are -1.6 for a 9 µm PVDF film, -1.8 for a 28 µm film and -2.0 for a 110 µm film. These inclinations were comparable with the simulated inclinations in the cases of all the film thickness of the PVDF film considered.
Published Version
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