Study On The Thermal Diffusivity And Thermal Conductivity By PTR Method

Photothermal Radiometry (PTR) is based on photoacoustic (PA) technology. It is a new detection technique with high sensitivity and non-destructive. This method is applied in many measurement fields.This paper mainly studies on the thermal diffusivity and thermal conductivity by PTR method. We give PTR's amplitude and phase signal of one dimension based on the theory of PTR, discuss the PTR's signal's frequency characteristic, and a method for measuring thermal diffusivity of opaque materials is introduced. Then, we study on anisotropic materials' thermal conductivity, the temperature field and thermal conductivity tensor of anisotropic materials is theoretically deduced from the theory of PTR, and is proved by the experiment.