Application of ultrasonic surface waves in the detection of microcracks using the scanning heating laser source technique  

作　　者：李加 董利明 倪辰荫 沈中华 张宏超 

机构地区：[1]Faculty of Science,Nanjing University of Science and Technology [2]Faculty of Science,Nanjing University of Aeronautics and Astronautics

出　　处：《Chinese Optics Letters》2012年第11期40-43,共4页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.61108013);the Program for New Century Excellent Talents in University;the Priority Academic Program Development of Jiangsu Higher Education Institutions;the Fundamental Research Funds for Central Universities(No.NUST2012ZDJH007)

摘　　要：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. Microeracks can be detected successfully by confirming the heating position at the point of maximal improvement of the transmission efficiency of the SAWs.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. Microeracks can be detected successfully by confirming the heating position at the point of maximal improvement of the transmission efficiency of the SAWs.

关 键 词：Acoustic surface wave devices HEATING LASERS MICROCRACKS SCANNING Surface waves Ultrasonic testing 

分 类 号：TP274.53[自动化与计算机技术—检测技术与自动化装置] TN249[自动化与计算机技术—控制科学与工程]