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Chin. Opt. Lett.
 Home  List of Issues    Issue 11 , Vol. 10 , 2012    10.3788/COL201210.111403


Application of ultrasonic surface waves in the detection of microcracks using the scanning heating laser source technique
Jia Li1, Liming Dong1, Chenyin Ni2, Zhonghua Shen1, Hongchao Zhang1
1 Faculty of Science, [Nanjing University of Science and Technology], Nanjing 210094, China
2 Faculty of Science, [Nanjing University of Aeronautics and Astronautics], Nanjing 210016, China

Chin. Opt. Lett., 2012, 10(11): pp.111403

DOI:10.3788/COL201210.111403
Topic:Lasers and laser optics
Keywords(OCIS Code): 140.6810  350.7420  

Abstract
This letter reports the application of the scanning heating laser source technique to detect microcracks that may be undetected by conventional methods. In the proposed approach, we monitor changes in the transmitted surface acoustic waves (SAWs) as a heating source is scanned over the crack. The experimental system for microcrack detection by a scanning heating laser source is obtained by exploiting the strong dependence of the transmission efficiency of acoustic pulses on the state of the contacts, whether open or closed, between the crack faces. Microcracks can be detected successfully by confirming the heating position at the point of maximal improvement of the transmission efficiency of the SAWs.

Copyright: © 2003-2012 . This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Received:2012/3/21
Accepted:2012/5/28
Posted online:2012/9/14

Get Citation: Jia Li, Liming Dong, Chenyin Ni, Zhonghua Shen, Hongchao Zhang, "Application of ultrasonic surface waves in the detection of microcracks using the scanning heating laser source technique," Chin. Opt. Lett. 10(11), 111403(2012)

Note: This work was supported by the National Natural Sci-ence Foundation of China (No. 61108013), the Pro-gram for New Century Excellent Talents in Univer-sity, the Priority Academic Program Development ofJiangsu Higher Education Institutions, and the Fun-damental Research Funds for Central Universities (No.NUST2012ZDJH007).



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