Evaluation of Notches in Pipes through the Use of Guided Wave and the Reflection Coefficient Method

Abstract

Ultrasonic guided wave quantitative detection technology has not been widely studied; this limits the application and development of guided waves testing technology greatly. For the quantitative detection study of notches in pipes, the theoretical model of guided waves interacted with notches has been built. Through the model, the relation formula between reflection coefficient and defects axial length and depth has been derived. The relation curves have been plotted based on the relation formula. And then, experiment method was used to verify the curves, the two methods can agree with each other. At last, the size of the defect was evaluated through the theoretical relation curves, the evaluation agrees with the practical size relatively. The research results provide necessary guide in theory to the defects quantification of guided wave detection.