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Simulation of differential circumferential wave induced by a laser pulse in hollow cylinder with an inner surface defect

Published online by Cambridge University Press:  25 May 2012

Y. Zhao ,
Z.H. Shen ,
J. Lu ,
X.W. Ni ,
Z.X. Wang  and
Y.P. Cui
Y. Zhao*
Affiliation:
Advanced Photonics Center, Southeast University, Nanjing 210096, P.R. China School of Science, Nanjing University of Science and Technology, Nanjing 210094, P.R. China
Z.H. Shen
Affiliation:
School of Science, Nanjing University of Science and Technology, Nanjing 210094, P.R. China
J. Lu
Affiliation:
School of Science, Nanjing University of Science and Technology, Nanjing 210094, P.R. China
X.W. Ni
Affiliation:
School of Science, Nanjing University of Science and Technology, Nanjing 210094, P.R. China
Z.X. Wang
Affiliation:
School of Science, Nanjing University of Science and Technology, Nanjing 210094, P.R. China
Y.P. Cui
Affiliation:
Advanced Photonics Center, Southeast University, Nanjing 210096, P.R. China
*
ae-mail: zhaoyan7906@mail.njust.edu.cn
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Abstract

A symmetrical detection configuration was developed to detect inner surface defect in a hollow cylinder by laser-induced ultrasonic. In this method, circumferential waves were detected at two points on the outer surface with ±90° relative to the laser source and their difference was used to obtain the differential circumferential wave. Finite element method was used to analyze the influence of inner surface defect’s position and size on the differential circumferential wave. The results show that the relative energy of differential circumferential wave and the emerging time of the bipolar waveform strongly depend on the defect’s size and the source-defect angle. As a result, the position of defect can be determined by the reach time of the bipolar waveform and the size can be evaluated by the relative energy of differential circumferential wave.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 58 , Issue 2 , May 2012 , 20503
Copyright
© EDP Sciences, 2012

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