Thermoreflectance technique to measure thermal effusivity distribution with high spatial resolution

Hatori, Kimihito; Taketoshi, Naoyuki; Baba, Tetsuya; Ohta, Hiromichi
November 2005
Review of Scientific Instruments;Nov2005, Vol. 76 Issue 11, p114901
Academic Journal
We have developed an apparatus to measure thermal effusivity distribution in solid materials with a high spatial resolution better than 10 μm by the thermoreflectance technique and the periodic heating method. A metal film sputtered on the surface of a sample is periodically heated by a modulated laser beam. The temperature response is measured by using another thin laser beam as a thermoreflectance signal. The thermal effusivity of the sample is derived from the phase lag of the temperature response from the periodic heating. Measurements of a functionally graded material and a fiber composite material are presented as application examples of this thermal effusivity distribution measurement technique.


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