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首页> 外文会议>Fifth International Conference on Optical and Photonics Engineering >Nondestructive inspection of aerospace composites by a fiber-coupled laser ultrasonics system
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Nondestructive inspection of aerospace composites by a fiber-coupled laser ultrasonics system

机译：纤维耦合激光超声系统对航空航天复合材料的无损检测

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摘要

Laser ultrasonics is a technique currently studied for nondestructive inspection of aerospace composite structures based on carbon fibers. It combines a pulsed laser impacting the surface generates an ultrasound inside the material, through the nondestructive thermoelastic effect. Second a detection interferometer probes the impacted point in order to measure the displacement of the surface resulting from the emitted ultrasound wave and the echo coming back from the different interfaces of the structure. Laser ultrasonics is of interest for inspecting complex shaped composites. We have studied the possibility of using frequency doubled YAG laser for the generation and which is fiber-coupled, together with a fiber-coupled interferometric probe using a YAG laser in the NIR. Our final system is a lightweight probe attached to a robot arm and which is able to scan complex shapes. The performances of the system are compared for different wavelengths of generations. Also we have studied some experimental parameters of interest such as tolerance to angle and focus distance, and different geometries of generation beams. We show some examples of inspection of reference parts with known defects, In particular C-scans of curved composites structures are presented.
机译：激光超声是一种目前正在研究的基于碳纤维的航空复合材料结构的无损检测技术。它结合了脉冲激光撞击表面，通过非破坏性热弹性效应在材料内部产生超声波。其次，检测干涉仪探测撞击点，以测量由发射的超声波和从结构的不同界面返回的回波导致的表面位移。激光超声对于检查复杂形状的复合材料非常重要。我们已经研究了使用倍频YAG激光器进行光纤耦合的可能性，以及使用近红外中使用YAG激光器的光纤耦合干涉探头的方法。我们的最终系统是连接到机械臂的轻型探针，它能够扫描复杂的形状。比较了不同世代波长的系统性能。我们还研究了一些有趣的实验参数，例如角度和聚焦距离的公差以及生成光束的不同几何形状。我们展示了一些检查已知缺陷参考零件的例子，尤其是弯曲复合材料结构的C扫描。

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