Study on Measuring Diffusivity of Materials by Pyroelectric Effect

An experiment of measuring thermal diffusivity of material by laser pyoelectric effect is reported. The phase of pyoelectric signal is detected by photothermal pyoelectric technique, then the thermal diffusivity of material is determined by nonlinear fitting. The detection system is designed. Single-arrange composite Al 2O 3/Al is measured, and thermal diffusivity at arbitrary direction was measured by this method.