基于激光超声技术的探损检测技术研究

摘要

Due to the high detection sensitivity,long transmission distance,small transmission attenuation of superconducting acoustic structure,it is widely used in the field of non-destructive test.Its high laser ultrasonic detection resolution,no contact,etc.,become a new research hot issues in the field of nondestructive testing.This paper discusses and studies the structural damage detection method based on laser ultrasonic technology.The hardware and control methods of the system and the relationship between the propagation state and the damage of Lamb wave are analyzed and studied.Signal analysis and feature extraction are performed from two different angles of complex wavelet transform and dispersion energy compensation focusing.Damage Imaging of aluminum plate is done by wavelet transform.The reference is provided for future practical engineering applications.%超导声波结构损伤比较敏感,传输距离长、传输衰减小,在无损领域的应用越来越广泛.激光超声检测分辨率高、不需要接触等,在无损检测领域已成为新的研究热点问题.深入讨论和研究了基于激光超声技术的结构损伤检测方法,完成激光超声检测系统的搭建,并对该系统的硬件和控制方法进行了分析和研究,对Lamb波的传播状态和损伤之间的关系进行分析.从复波小波变换和色散能量补偿聚焦2个不同的角度进行信号分析和特征提取.完成小波变换法对铝板的损伤成像.为以后的实际工程应用,提供借鉴和参考.