Application of ultrasonic surface waves in the detection of microcracks using the scanning heating l

• 作 者: 李加 董利明 倪辰荫 沈中华 张宏超
• 机 构: Faculty of Science,Nanjing University of Science and Technology,Faculty of Science,Nanjing Universit
• 出 处: Chinese Optics Letters
• 发表日期: 2012年11期
• 关键词: heating contacts scanned letter maximal monitor irradiation ultrasonic initially

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.

This letter reports the application of the scanning heating laser source technique to detect microcracks that may be undetected by conventional methods. 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 confirmed by confirming the heating position at the point of maximal improvement of the transmission efficiency of the SAWs.