报道了一种用激光光热辐射技术测量不透明材料热扩散率的方法。根据红外探测器在不同频率下测得试样光热信号的振幅和相位 ,采用非线性拟合法 ,由振幅和相位分别对频率进行非线性拟合 ,由此可得材料的热扩散率 ,并对单向氧化铝纤维基复合材料进行了测量 ,给出了任一方向上的热扩散率的实验结果 A method of measuring thermal diffusivity of opaque materials by laser photothermal radiation is reported. According to the amplitude and phase of the photothermal signal of the sample measured by the infrared detector at different frequencies, a non-linear fitting method is adopted to respectively nonlinearly amplify the frequency by the amplitude and the phase, thereby obtaining the thermal diffusivity of the material and Uniaxial alumina fiber matrix composites were measured and experimental results of thermal diffusivity in either direction were given