基于电磁超声换能器的电磁声发射检测方法研究  

The research based on the electromagnetic acoustic transducer of electromagnetic acoustic emission detection method

作　　者：郭富坤 杨庆新[1] 金亮[1] 邱运涛[1] 祝丽花[1] 李阳[1] 张献[1] 刘雪莉[1] 

机构地区：[1]天津工业大学天津电工电能新技术重点实验室,天津300387

出　　处：《中国科技论文》2016年第23期2721-2726,共6页China Sciencepaper

基　　金：国家自然科学基金资助项目(51207105;51577132);高等学校博士学科点专项科研基金资助项目(20121201120003)

摘　　要：针对金属构件裂纹快速拓展导致构件突然断裂等问题,为了对活性缺陷进行检测或对缺陷的损伤程度进行评估,提出了1种将电磁超声换能器(electromagnetic acoustic transducer,EMAT)电磁加载装置应用于电磁声发射的检测方法,并构建了具有输出激励信号、数据采集、信号处理、数据存储等功能于一体的虚拟仪器;搭建了完整的实验系统,进行铝板和钢板试件的检测实验,采集声发射信号。通过对比人工缺陷、通孔和完好板材的信号,证明了使用EMAT可有效进行电磁声发射检测,在提高EMAT的检测能力的同时也使电磁声发射的检测方法易于工程应用。Aiming at the rapid expansion of the crack in metal component which leads to the component suddenly break, to realize active defects detection or evaluate the damage degree of defects this paper applies the EMAT（electromagnetic acoustic transduc-er） electromagnetic loading device in the electromagnetic acoustic emission detection, constructed with output excitation signal, data acquisition, signal processing, data storage, and other functions in the integration of virtual instrument, the complete experi-mental system is set up, the test experiment of aluminum sheet and plate specimen detection are carried out, acquisition of acous-tic emission signals. By comparing the defect, hole and intact plate signal, the EMAT can be used for the detection of electromag-netic acoustic emission Improve the EMAT detecting ability at the same time, also make the electromagnetic acoustic emission detection method is easy to engineering application

关 键 词：电磁声发射 电磁超声换能器 虚拟仪器 数据采集 信号处理 

分 类 号：TG115.28[金属学及工艺—物理冶金] TB552[金属学及工艺—金属学]