基于差分脉冲涡流的大提离下坑蚀检测方法研究  

Detection Method Research for the Pitting Corrosion under Large Lift-off Based on Differential Pulsed Eddy Current

作　　者：袁梦 武新军[1] YUAN Meng;WU Xin-jun(School of Mechanical Science and Engineering,Huazhong University of Science and Technology)

机构地区：[1]华中科技大学机械科学与工程学院

出　　处：《化工自动化及仪表》2024年第6期996-1000,共5页Control and Instruments in Chemical Industry

基　　金：国家重点研发计划(批准号:2023YFF0615103)资助的课题。

摘　　要：针对大提离下铁磁性材料坑蚀检测的难题,提出基于差分脉冲涡流的线圈结构。通过实验定性分析3种差分布置方式对信号的影响,表明外部差分可保证信号对称性。进而对比不同提离下外部180°、90°差分结构缺陷信号幅值,表明外部180°差分结构更优。最后在100 mm提离下采用外部180°差分接收线圈3检测直径20 mm、深2.4 mm平底孔,其幅值为0.3 mV,表明该结构可在大提离下检测坑蚀。Aiming at the difficulty in detecting the pitting corrosion of ferromagnetic materials under large lift-off,a coil structure based on differential pulsed eddy current was proposed.In addition,the effect of three differential arrangements on the signal was qualitatively analyzed through experiments to show that,the external differential can guarantee the symmetry of the signal.Comparing the signal amplitude of the external 180°and 90° differential structures under different lift-offs shows that,the external 180° differential structure is better;making use external 180° differential receiving coil 3 detect both 20-mm-diameter and 2.4-mm-deep flat bottom hole under 100 mm lifting indicates that when the amplitude stays at 0.3 mV,this structure can detect pitting corrosion under large lifting.

关 键 词：脉冲涡流 大提离 铁磁性材料 坑蚀检测 差分信号 

分 类 号：TP29[自动化与计算机技术—检测技术与自动化装置]