Abstract
This paper proposes a method of acoustic vibration testing based on a point source generated by laser-induced breakdown. A high-power YAG pulse laser is used in this system for generating laser-induced breakdown in acoustic fields. Laser-induced breakdown is generated by reaching the local intensity of the laser beam for 10^9W/mm^2. For this reason, a convex lens is used to focus the laser beam. Laser-induced breakdown can be generated in arbitrary acoustic field by using varied convex lenses with focal length (spot radius). Therefore a speaker for conventional acoustic vibration testing has no use for installation in this method. The system is validated by comparing the resonant frequency of a micro space measured by laser-induced breakdown and calculated by theoretical model.
