一种利用激光超声技术检测裂纹位置的策略

为了检测工程机械疲劳裂纹所在位置,本文利用 激光超声技术,基于脉冲回波法(Pulse-echo)提出了一种检测裂纹所在位置的策略。结果表明:通过将探测光源放置在 近 场区域,同时将探测源与激励源相对固定,两次移动材料的这种策略,可使两次移动过程中 利用探测光位置代表裂纹左右边缘,从而能得到裂纹所在的位置及裂纹的宽度。实验证明, 本策略可用于定位裂纹误差,与传统的光源设置方法中单向移动扫描的方式相比,能够同时 得到裂纹的位置信息和宽度大小。本文为激光超声检测工程机械裂纹位置提供了一种策略。

A strategy for detecting crack location using laser ultrasonic technology

In order to detect the location of fatigue cracks in engineering machin ery,this paper proposes a strategy to detect the location of cracks based on pulse echo method (Pulse-echo) using laser ultrasonic technology.The results show that by placing the detectio n source in the near-field region and simultaneously fixing the detection source and the excita tion source,the strategy of moving the material twice can make the position of the probe light r epresent the left and right edges of the crack during the two movements,so that The location wher e the crack is located and the width of the crack are obtained.Experiments show that this stra tegy can be used to locate the crack error.Compared with the traditional one-way moving sca nning method, the position information and the opening width of the crack can be obtained at t he same time. This paper provides a strategy for laser ultrasonic inspection of engineering ma chinery crack locations.