Realization of acoustic resonant microscopy and its application for monitoring the moisture content in an electrolyte film for fuel cell

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A technique for evaluating the acoustic properties of a layered medium utilizing an acoustic resonant phenomenon has been developed. The polymer film to be tested was attached onto the transparent glass plate and the acoustic resonant phenomenon via the film was observed together with acquiring the optical microscope image at the corresponding area. The acoustic-optical hybrid microscopy technique realized to visualize the fluctuation of the coating thickness on a steel plate and to detect the thermal degradation of a film. For example, the changes in the linear low-density polyethylene films were different depending on the methods and conditions for heat treatments and the difference could be detected by the present technique.