Development of modulated laser calorimetry using a solid platinum sphere as a reference

This study is a fundamental investigation aimed at developing a new noncontact modulated laser calorimetry method incorporating a static magnetic field to achieve measurement of the true thermal conductivity of a metallic melt. For establishing the experimental principle, a solid platinum sphere was used in this study. The sphere positioned in the centre of a radio frequency coil was heated sinusoidally by a laser; its temperature response was monitored. Analyses of the temperature amplitude and phase difference between the laser input and temperature response yielded the heat capacity, thermal conductivity and hemispherical total emissivity of platinum for temperatures of 1400 - 1700 K. The obtained data agree with the reference data within experimental uncertainty, which verifies the experimental method.