Abstract:

Current ultrasonic guided wave detection can acquire information on the pipepline's health by analyzing the echo signal,but it fails to provide circumferential information on the pipeline defects.This paper studies the circumferential localization of pipeline defects by analyzing the energy distribution of ultrasonic guided waves when they pass through the defect of the pipe and the theory of circumferential localization.The F(1,3) mode guided wave has only one circumferential wave.Based on this fact,we present the quadrant energy difference locating defect method.Experimental results show that this method precisely judges the circumferential position of the defects.

Key words: ultrasonic guided wave;pipeline defects;circumferential localization;F1 3 mode;energy distribution