Imaging slit in metal plate using aerial ultrasound source scanning and nonlinear harmonic method

Abstract

We previously proposed a stable high-speed visualization measurement method that combines nonlinear harmonics with aerial ultrasonic wave source scanning. In this paper, a more efficient method is proposed to visualize a slit flaw in a metal plate. The results show that visualization of the propagation of ultrasonic waves was possible by wave source scanning. Harmonic propagation was also visible. The slit in the metal plate was visualized with the same accuracy as that of the previous laser probe scanning method.