A new surface wave EMAT with high SNR and the application for defect detection in thick-walled pipes - 文章详情页

作者：

He, Cunfu (He, Cunfu.) (学者：何存富) | Deng, Peng (Deng, Peng.) | Lü, Yan (Lü, Yan.) | Jiao, Jingpin (Jiao, Jingpin.) (学者：焦敬品) | Wu, Bin (Wu, Bin.)

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摘要：

A　type　of　surface　wave　EMATs　with　different　configuration　is　developed　to　improve　the　signal　to　noise　ratio　(SNR)　of　receive　signal　in　pulse-echo　mode.　The　mechanism　which　improve　the　receive　signal　SNR　and　the　influence　factors　are　analyzed.　It　is　the　interval　between　magnet　and　meander-line　coil　that　decrease　the　disturbance　of　the　ultrasonic　in　magnet,　and　then　the　receive　signal　SNR　are　improved.　It　is　shown　that　the　SNR　of　receive　signal　is　not　only　related　with　the　interval　between　magnet　and　meander-line　coil,　but　also　positively　correlated　with　the　EMAT　center　frequency.　The　performance　of　3　surface　wave　EMATs　is　evaluated　and　it　is　found　that　the　measured　center　frequency　is　consistent　with　the　design　value　and　the　directivity　is　agreed　well　with　theoretical　analysis.　The　5　defects　with　different　depth　on　the　standard　block　are　tested　by　the　developed　surface　wave　EMATs.　The　testing　result　shows　that　the　defect　can　be　detected　when　the　depth　reaches　about　¼　wavelength.　What＇s　more,　3　types　of　defect　on　a　thick-walled　pipe　such　as　circumferential　rectangular　slot,　axial　rectangular　slot　and　flat-bottom　hole　are　respectively　detected　by　the　developed　EMATs　with　center　frequency　of　1.0　MHz.　©　2017　Journal　of　Mechanical　Engineering.

关键词：

Defects Magnets Signal to noise ratio Surface waves Ultrasonic applications

作者机构：

[ 1 ] [He, Cunfu]College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing; 100124, China
[ 2 ] [Deng, Peng]College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing; 100124, China
[ 3 ] [Lü, Yan]College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing; 100124, China
[ 4 ] [Jiao, Jingpin]College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing; 100124, China
[ 5 ] [Wu, Bin]College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing; 100124, China

通讯作者信息：

何存富
[he, cunfu]college of mechanical engineering and applied electronics technology, beijing university of technology, beijing; 100124, china

电子邮件地址：

hecunfu@bjut.edu.cn

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