中国激光, 2012, 39 (3): 0303003, 网络出版: 2012-01-17   

弱散射材料中激光超声单散射理论模型

Theoretical Model of Singly-Scattered Laser-Induced Ultrasound in Weak-Scattering Materials
作者单位
1 江苏大学理学院, 江苏 镇江 212013
2 江苏大学机械工程学院, 江苏 镇江 212013
摘要
基于扩散波传输理论,针对弱散射介质中的激光超声散射,提出单散射假设,建立包含信号源、超声散射和接收信号的理论模型。理论分析结果表明横波和纵波的散射机理相同,得到了横波和纵波的单散射强度在时间域的分布规律。进而分析统计平均深度和衰减系数对单散射强度的影响。为材料的无损检测、材料微观结构的分析及性能评价提供理论依据。
Abstract
Based on the diffuse wave transfer theory, a theoretical model of singly-scattered laser-induced ultrasound in time domain which contains signal source, scattering and received field is developed under the assumption of singe- scattering. Theoretical results indicate that transversal and longitudinal wave have the common scattering mechanism and the singly-scattered intensity distribution of transversal and longitudinal wave in time regime are got. Furthermore, statistical average depth and attenuation coefficient are discussed for their influence on intensity distribution. The model has given theoretical description for non-destructive evaluation and micro-structural analysis of materials.
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许伯强, 杨小平, 徐桂东, 徐晨光, 陈安麒, 刘洪凯. 弱散射材料中激光超声单散射理论模型[J]. 中国激光, 2012, 39(3): 0303003. Xu Baiqiang, Yang Xiaoping, Xu Guidong, Xu Chenguang, Chen Anqi, Liu Hongkai. Theoretical Model of Singly-Scattered Laser-Induced Ultrasound in Weak-Scattering Materials[J]. Chinese Journal of Lasers, 2012, 39(3): 0303003.

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