三层固体材料的光声效应理论与实验

Theory and Experiments on the Photoacoustic Effect in Three Layer Solids

Ｒｏｓｅｎｃｗａｉｇ－Ｇｅｒｓｈｏ的光声效应理论推广应用于三层固体材料的研究。给出了在固体和气体交界处的周期温度的一般表达式。数值计算并分析了三层材料中光、热参数和样品厚度变化对光声信号幅度、相位与频率变化关系的影响，并与实验结果进行了对照。

The Rosencwaig Gersho theory of the photoacoustic effect is extended to the case of three layer solids. The general expression for the complex amplitude of the periodic temperature at the solid gas boundary is obtained. The phase and relative magnitude of the photoacoustic signal varying with chopping frequency for varies optical absorption coefficients, thermal conductivity coefficients and material depths are numeralty calculated and compared with the experimental results.