Engineering Research Equipment Grant: Laser Array Induced Ultrasound for Quality Control

该合同用于购买调q YAG激光器、隔振光学工作台和光学安装设备。该设备将用于支持不断发展的超声激光阵列生成领域的研究。该技术将用于在线实时控制焊接质量，特别是焊缝渗透深度和气孔率。超声波是一种很有前途的焊接质量控制方法，因为它能够穿透不透明的物体并在不连续处反射。该研究有望产生一种更有效的非接触式激光超声产生技术，用于材料和工艺的无损检测。这项正在开发的技术使用一组激光束来代替单一的激光束。一种非接触式电磁声换能器将被用作接收器

The award is for an equipment grant to purchase a Q-switched YAG Laser, vibration isolation optical table, and optical mounting devices. The equipment will be used to support research in the evolving area of laser array generation of ultrasound. This technology will be used on-line to control weld quality in real- time, in particular the depth of weld penetration and porosity. Ultrasonics is a promising method for weld quality control because of its ability to penetrate opaque bodies and be reflected at discontinuities. The research is expected to yield a significantly more efficient technique of noncontact laser generation of ultrasound, for nondestructive testing of materials and processes. The technique being developed uses an array of laser beams in place of a single laser beam. A noncontact electromagnetic acoustic transducer will be used as a receiver.//