The Effect of Laser Parameters on the Ultrasonic Signal of Laser Ultrasonic Detection of GIS Basin-Type Insulator

Abstract

Laser ultrasonic technology has the advantages of non-contact, remote detection, wide frequency band and high spatial resolution, and is widely used in the field of material nondestructive testing. At present, GIS basin insulator defect detection method is affected by environmental electromagnetic interference and cannot be on-line. As a non-contact detection method, laser ultrasonic detection technology has the potential advantage of on-line detection. However, the detection technology of basin-type insulators based on laser ultrasonic is still in its infancy. Firstly, the theoretical model of laser ultrasonic excitation GIS basin insulator is established. Then the characteristics of excited ultrasonic signal are studied according to different laser energy, pulse width and laser rise time. Finally, it is concluded that the incident laser parameters will directly affect the amplitude and frequency of the excitation ultrasound through simulation analysis, which provides a basis for selecting the optimal laser excitation parameters for the laser ultrasonic testing of the basin-type insulator.