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Non-destructive Evaluation of Steel-Structure using Laser-generated Ultrasonic

机译：激光产生的超声波对钢结构的无损评估

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In the present study, a Nd;YAG Laser (pulse type) was used to emit ultrasonic signals to a test material. In addition, a total ultrasonic investigation system was designed by adopting a Fabry-Perot interferometer, which receives ultrasonic signals without any contact. For non-destructive test SM45C, which contains some flaws was used as a test material. Because it is easy to align light beam in receiver, and the length of the light beam does not change much even if convex mirror leans towards one side, confocal Fabry-Perot interferometer, which has stable frequency, and PI control are used to correct interfered and unstable signals from temperature, fluctuation and time shift of laser frequency. Stable signals are always obtained by the feedback of PI circuit signals in the confocal Fabry-Perot interferometer. The type, size and position of flaws inside the test material were examined by achieving the stabilization of an interferometer. This study presented a useful method, which could quantitatively investigate the fault of objects by using a Fabry-Perot interferometer.
机译：在本研究中，使用Nd; YAG激光（脉冲型）将超声信号发射到测试材料。此外，通过采用Fabry-Perot干涉仪设计了一套完整的超声检查系统，该系统可以无接触地接收超声信号。对于包含一些缺陷的无损检测SM45C，用作检测材料。因为很容易在接收器中对准光束，并且即使凸面镜向一侧倾斜，光束的长度也不会改变很多，所以共焦法布里-珀罗干涉仪具有稳定的频率，并且使用PI控制来校正干扰以及来自温度，激光频率的波动和时移的不稳定信号。始终通过共焦法布里-珀罗干涉仪中PI电路信号的反馈获得稳定的信号。通过实现干涉仪的稳定性来检查测试材料内部缺陷的类型，大小和位置。这项研究提出了一种有用的方法，该方法可以使用Fabry-Perot干涉仪来定量研究物体的故障。

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