Non-Contact Vibration Testing Based on Impulse Response Excited by Laser Ablation

提出了一种基于激光烧蚀激励脉冲响应的非接触式振动测试系统。该系统采用高功率Nd：YAG脉冲激光器，在结构表面产生理想的冲击力。因此，在该系统中可以测量高频频率响应函数（FRF）。我研究了三种方法，如下：一种方法，它可以通过只测量输出（加速度响应）在激光激励实验，使用激光烧蚀产生的脉冲声源的声学振动测试的方法，和一种方法的非接触实验振动分析的水下结构的脉冲激光烧蚀。

I proposed a non-contact vibration testing system based on an impulse response excited by a laser ablation. A high-power Nd: YAG pulse laser is used in this system for producing an ideal impulse force on a structural surface. Therefore, it is possible to measure high frequency frequency response functions (FRF) in this system. I investigated three methods as follows: a method that makes it possible to analyze FRF by only measuring the output (acceleration response) in a laser excitation experiment, a method of acoustic vibration testing using a pulse sound source generated by laser ablation, and a method of a non-contact experimental vibration analysis for underwater structures by pulsed-laser ablation.