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

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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.