SBIR Phase I: 3-D Laser-based ultrasonic inspection system

该小型企业创新研究(SBIR)第一阶段研究项目描述了基于激光的超声(LBU)无损评估(NDE)的创新方法。拟议的检测系统将允许高效地产生压缩波和横波，以及同时对超声波位移的三个分量进行激光测量。LBU现在已经成为在线检测的宝贵工具，显示了其在钢铁和航空航天行业的优势。遗憾的是，这些系统没有充分利用现有的超声信息，因为它们只基于压缩波的传播，并且只测量平面外的位移。在无损检测中，迫切需要一种能够在垂直入射时有效地产生横波的激光发生器，以及一种能够同时测量超声场的三分量(即：测量界面属性、材料各向异性或残余应力)的激光超声接收器。高效和远程产生压缩波和横波的能力与同时和远程测量超声场的三个分量的能力相结合，将对在线过程控制以及材料表征研究非常有利。有了这个拟议的LBU系统，基于剪切波检测的无损检测技术现在可以在没有机械接触的情况下远程进行，从而实现对高温材料的快速在线检测。将从这种新的无损检测工具中受益的行业包括：金属行业、航空航天行业、汽车行业和涂料行业。

This Small Business Innovation Research (SBIR) Phase I research project describes an innovative approach for Laser-Based Ultrasonic (LBU) Non-Destructive Evaluation (NDE). The proposed inspection system will allow efficient laser generation of both compression and shear waves, as well as simultaneous laser measurement of the three-component of the ultrasonic displacement. LBU has now become a valuable tool for on-line inspection, demonstrating its advantages in the steel and aerospace industries. Unfortunately, these systems do not take advantage of the whole ultrasonic information available because they are based on only the propagation of compression wave and they only measure the out-of-plane displacement. There is a strong need in NDE for both a laser generation capable of efficiently generating shear waves at normal incidence and for a laser ultrasonic receiver capable of measuring simultaneously the three-component of the ultrasonic field (i.e.: measurement of interface properties, material anisotropy or residual stress evaluation). The ability to efficiently and remotely generate both compression and shear waves combined with the ability to simultaneously and remotely measure the three-components of the ultrasonic field will be very beneficial for on-line process control as well as for research material characterization. With this proposed LBU system, NDE inspection techniques based on shear wave detection could now be carried out remotely without mechanical contact, allowing for rapid, in-process inspection of high temperature material. The industries that will benefit from this new NDE tool include: The metal industry, the aerospace industry, the automotive industry and the coating industry.