Nondestructive characterization of aluminum grain size using a ring-shaped laser ultrasonic method

In this study, a nondestructive ring-shaped laser ultrasonic method with thermoelastic excitation regime was used to determine the grain size of metal materials. This proposed in order evaluate quality fast online manner. Normally, is detect ablation regime. The excites high energy longitudinal waves but causes damage surface To achieve strict testing, work. converted from circular collimated by an axicon and irradiated on aluminum sample induce enhance signal amplitude. directivity pattern analyzed find suitable detection parameter finite element before performing ultrasound experiments. Quantitative analysis converging different deviations center via experiments demonstrated enhancement effect using laser. issues low generation were solved aimed at inspection. Aluminum samples mean sizes detected technology. A characterization model built signals. Laser-generated technology promising can be material properties nondestructively