Thermal Diffusivities and Thermal Effusivities of the Metal Materials Studied by the Photoacoustic Technique

The thermal diffusivities and thermal effusivities of metal materials have been measured by the Photoacoustic Technique. Firstly, based on the simplified R-G model, the one-dimensional theory of photoacoustic was analyzed. The corresponding experimental system has been set up, by which the photoaoustic signal of the solid photoacoustic cell can be obtained. Secondly, the thermal diffusivity and thermal effusivity of reference samples were measured, by which the experimental system can be validated. Finally, the diffusivities and effusivities of several kinds of metal material were studied by the photoacoustic cell system. Comparing with the corresponding reference data, it is shown that the photoacoustic techniques can be used to measure both the thermal diffusivity and effusivity of metal materials effectively. The relative error between the experiment data and the reference data are less than 3%.