Visualization and quantitative analysis of interfacial thermal barrier by a thermal microscope

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A point or areal irradiation of a laser light is equipped to heat a specimen and to detect a specimen temperature. This method is suitable for investigating a local variation of thermal properties of the specimen. In the present study, a line focused laser beam is equipped for heating a specimen to suppress an extinction of heat wave and to restrict a direction of propagation. This allows us to measure not only the thermal diffusivity more preciously but also the anisotropy of the thermal properties. At present, the thermal resistance of the grain boundary is not able to measure quantitatively, however, know-hows of the measurement is accumulating.