Inversion method for defects in depth evaluation and thermal wave imaging

A hybrid Newton-like iterative method and a regularization method are employed to perform the numerical simulations of the defects in depth evaluation and the thermal wave imaging for defects-included solid sample by analysis of the surface photo-thermal signals. A simple and effective data processing method is suggested to improve the reconstructed data. The results of the numerical calculation demonstrate that the algorithm presented in this paper is very effective, and can be used for qualitative and quantitative analyses of homogeneous materials with defects in depth included. It is also proved that the algorithm is stable even with noise disturbance.     

基于光声光热检测的反演技术在热波成像及缺陷分析方面的应用

从样品表面光声光热信号出发,利用一种类似Newton迭代的反演算法和正则算法对内含缺陷的样品的热学参数予以深度剖面重构.引入一种简单且行之有效的数据处理方法对重构数据进行处理,最终实现对试样的热波成像和缺陷分析.数值模拟的结果证明了该方法的有效性及在噪声扰动下的稳定性和实用性.     

自由表面波GreenOV函数及其导数的快速算法

快速而又精确地求得领域Ｇｒｅｎｎ函数值是应用频域Ｇｒｅｅｎ函数求解波物相互作用问题的关键。探讨了无限水深频域自由面Ｇｒｅｅｎ函数及其导数的快速算法问题，提出了一个实用有效的计算方法。