一种利用激光超声技术检测裂纹位置的策略

A strategy for detecting crack location using laser ultrasonic technology

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。

In order to detect the location of fatigue cracks in engineering machinery,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 detection source in the near-field region and simultaneously fixing the detection source and the excitation source,the strategy of moving the material twice can make the position of the probe light represent the left and right edges of the crack during the two movements,so that The location where the crack is located and the width of the crack are obtained.Experiments show that this strategy can be used to locate the crack error.Compared with the traditional one-way moving scanning method,the position information and the opening width of the crack can be obtained at the same time.This paper provides a strategy for laser ultrasonic inspection of engineering machinery crack locations.