“钢-铅”粘接结构非接触激光超声检测方法  

Non-contact laser ultrasonic testing of steel-plumbum bonding structure

作　　者：夏嘉斌[1,2] 孙广开[2,3] 宋潮 周正干[3] 

机构地区：[1]合肥工业大学仪器科学与光电工程学院,安徽合肥230009 [2]北京信息科技大学光电测试技术北京市重点实验室,北京100101 [3]北京航空航天大学机械工程及自动化学院,北京100191 [4]中北大学电气与控制工程学院,山西太原030051

出　　处：《红外与激光工程》2018年第1期226-232,共7页Infrared and Laser Engineering

基　　金：国家自然科学基金(U1430120,51375027)

摘　　要：为了解决核工业领域防辐射用钢铅粘接结构的非接触、高精度无损检测问题,研究激光超声检测方法。建立了粘接结构模型,分析了激光超声的传播及脱粘导致的声波反射和衰减;实验测量了良好粘接与脱粘处的窄带激光超声信号,观测到脱粘导致的界面反射信号幅度变化;分析得出表征脱粘的激光超声反射系数与声波频率和测量位置的关系;通过激光超声C扫描方法实现模拟脱粘试样的检测与成像。研究表明:激光超声方法可以实现两层钢铅粘接结构脱粘的成像检测,在核工业防辐射结构检测中具有应用前景。In order to solve the problem for the non-contact and high precision nondestructive testing of steel-plumbum bonding structures used for radiation inhibition in nuclear industry, the laser ultrasonic testing method was studied. The model of the steel-plumbum bonding structure was established. The propagation of laser ultrasonic and the wave reflection and attenuation induced by the debonding defect were analyzed. The narrowband laser ultrasonic signals were measured at the good bonding and debonding region, and the variation of the amplitude of the interface reflected signal induced by the debonding defect was observed. For the characterization of the debonding defects, the relation of the reflection coefficient with the wave frequency and measuring position was analyzed. The detection and imaging of the specimen with simulated debonding defects were realized by the laser ultrasonic C-scan method. The research results show that the imaging testing of debonding defects in the two-layer steel-plumbum bonding structure can be realized using the laser ultrasonic method, it has application prospect in the nuclear industry for the testing of radiation protection structures.

关 键 词：核工业 粘接结构 脱粘 激光超声 无损检测 

分 类 号：TB553[理学—物理]