Small-depth-diameter-ratio special-shaped pipe inner wall circumferential crack surface wave detection method

The invention discloses a small-depth-diameter-ratio special-shaped pipe inner wall circumferential crack surface wave detection method and belongs to the field of ultrasonic non-destructive testing.The small-depth-diameter-ratio special-shaped pipe inner wall circumferential crack surface wave detection method is innovatively characterized by arranging surface wave sensors in the radial direction of the end portion of a special-shaped pipe, and according to the reflecting and transmission characteristics of surface waves on the internal edge of the end portion, reasonably selecting detectingfrequency and detecting the circumferential cracks of the inner wall of the special-shaped pipe through axial surface waves transmitted to the inner wall of the pipe. According to the small-depth-diameter-ratio special-shaped pipe inner wall circumferential crack surface wave detection method, the contact surfaces between the sensors and the end portion of the pipe are flat, and the coupling state of the sensors and the e