物理学报Issue(13)：1-7,7.DOI:10.7498/aps.64.134302
研究激光激发的声表面波与材料近表面缺陷的振荡效应∗
Research on the oscillation effect of near-surface metal defect based on laser-generated acoustic surface wave
摘要
Abstract
According to the thermoelastic equations and heat conduction equations of laser-generated acoustic surface wave (SAW), the SAW propagation images are obtained by taking finite element solutions to the equations. When the SAW propagates through the aluminum plate with the near-surface defects at different depths, producing an oscillating effect between the surface acoustic wave and the near-surface defects, and then there is a gradual decrease after the gradual decrease of the oscillation waves as getting through the near-surface defect. When the SAW propagates through the aluminum plate with the near-surface defect at different depth, there is a certain variation of the center frequency of the oscillation waves. Simulation results show that, when the depth of near-surface defect changes from 0.1 to 0.5 mm, the center frequency of the oscillation signal generated by the oscillation effect changes from 0.4 to 0.76 MHz, and the center frequency of the oscillation signal is seriously attenuated with increasing width of the near-surface defect, thus providing a theoretical basis for quantitative detection of the near-surface defects.关键词
声表面波/近表面缺陷/振荡效应/定量检测Key words
surface acoustic wave/near-surface defects/oscillation effect/quantitative detection引用本文复制引用
曾伟,王海涛,田贵云,胡国星,汪文..研究激光激发的声表面波与材料近表面缺陷的振荡效应∗[J].物理学报,2015,(13):1-7,7.基金项目
国家科技部国际合作项目(批准号:2011DER71080)、欧盟FP7项目“Health monitoring of offshore wind farms”(批准号:FP7-PEOPLE-2010-IRSES 269202)、江苏省研究生培养创新工程(批准号：KYLX_0252)和中央高校基本科研业务费专项资金资助的课题.* Project supported by the FP7 project”Health Monitoring of Offshore Wind Farm (HEMOW)”(Grant No. FP7-PEOPLE-2010-IRSES), Graduate Education Innovation Project of Jiangsu Province, China (Grant No. KYLX_0252), and the Chinese Ministry of Science and International Cooperation Project (Grant No.“2011DFR71080”) （批准号:2011DER71080）
