文章摘要
王余敬,吴耀金,刘辉,郭华玲.声表面波检测铝板表面微缺陷深度实验研究[J].,2016,35(1):36-41
声表面波检测铝板表面微缺陷深度实验研究
Experimental study on depth evaluation of micro-surface crack by laser generated acoustic surface waves
投稿时间:2015-06-08  修订日期:2015-12-28
中文摘要:
      用激光器在一系列不同缺陷试件铝板上激发激光超声,通过连续脉冲激光进行线光源激励,用超声传感器接收在铝板中传播的激光超声信号,通过数字荧光示波器采集得到激光超声在铝板中传播的数据。对采集到的透射波数据进行频域分析和反射波数据进行分离谱分离过程得到铝板中激光超声的时域分布。实验发现:缺陷深度影响着反射回波两峰值特征点到达时间差,两者之间近似有线性的关系,透射波频谱截止频率随着缺陷深度变化呈现一定的规律,缺陷深度与透射波的截止频率也有近似线性的关系。
英文摘要:
      With a laser in a range of different flaw test pieces on an aluminum plate fires laser ultrasonic, perform continuous line source excitation by a pulsed laser, receives the laser ultrasonic signal in aluminum plate with ultrasonic sensors, get laser ultrasonic propagation data in aluminum with digital phosphor oscilloscope .The collected data transmitted wave frequency domain analysis and the reflected wave data split-spectrum processing obtained laser ultrasonic signal temporal distribution in aluminum. Turn out,defect depth affects the reflection echo peak two feature points difference in arrival time, there are approximately linear relationship between the two. the cut-off frequency of the transmitted wave spectrum with defect depth change presents certain rules, defect depth and transmitted wave cut-off frequency is also approximately linear relationship.
DOI:10.11684/j.issn.1000-310X.2016.01.006
中文关键词: 激光超声,分离谱,声表面波,表面缺陷
英文关键词: laser  ultrasonic, split-spectrum  processing, acoustic  surface waves,surface-breaking  defect
基金项目:教育部博士点基金联合资助项目(2013142012007)
作者单位E-mail
王余敬 中北大学 机电工程学院 wmf_828@163.com 
吴耀金 中北大学 机电工程学院 495112685@qq.com 
刘辉 中北大学 计算机与控制工程学院 576043973@qq.com 
郭华玲 中北大学 计算机与控制工程学院 834086353@qq.com 
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