Abstract
A photoacoustic cell was built for thermal wave measurements above room temperature, allowing the detection of thermal waves in transmission and reflection. These two modes are necessary to determine both thermal diffusivity and effusivity. The cell has been successfully tested with compact materials such as molybdenum samples of finite thickness and neutral density glasses. The first measurements with rough and porous graphite samples have been taken between room temperature and 1000 K, where two operation techniques are used: frequency-dependent measurements at constant temperatures and temperature scans at a fixed modulation frequency of the induced thermal wave.
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