随机粗糙表面超声双透射研究

Study on the double transmission of ultrasonic waves from statistic rough surfaces

基于Fresnel近似及相屏近似理论建立了随机粗糙表面的声波双透射信号损失理论模型，提出采用指数替代法消除非线性积分项实现双透射信号损失的简单解析解。研究表明，观透射信号损失不仅与粗糙高度有关，而且与声波传播路径即缺陷深度有关。

A model evaluating the signal loss of the acoustic beam of double transmissions from random rough surfaces was established based on the riesnel approximation and phasescreen approximation. A simple analytical solution was achieved using the exponential substitution approach to remove the nonlinear integral term. The factors that affect the signal of double transmissions from random rough surfaces was analyzed. The research results demonstrate that the signal loss is not only related to root-mean-squire height, but also related to the distance of wave traveled in the materials.