GIL metal particle detection method based on ultrasonic guided wave

The invention relates to a GIL metal particle detection method based on ultrasonic guided waves, and belongs to the technical field of state monitoring of ultra-high-voltage and extra-high-voltage power transmission and transformation equipment. A GIL metal particle detection system based on ultrasonic guided waves is adopted, structural parameters of the outer diameter and the inner diameter of a GIL are input, and the frequency and the mode of the guided waves transmitted by an ultrasonic guided wave transmitting module are selected; an ultrasonic guided wave transmitting and receiving module transducer is installed, the positions of the ultrasonic guided wave transmitting and receiving module from the end face of a near-side insulator are measured, transmitting of ultrasonic guided waves is controlled through a data processing module, the received guided waves are analyzed and processed, and whether the GIL contains metal particles or not is judged. The device has the beneficial effects that high-sensitivi