基于脉冲漏磁原理的涂覆层下腐蚀缺陷检测  

Detection of Corrosion under Coating Using Pulsed Magnetic Flux Leakage Technique

作　　者：左宪章[1,2] 张韬[1] 田贵云[2] 张云[1] 费骏骉[1] 

机构地区：[1]军械工程学院电气工程系,石家庄050003 [2]纽卡斯尔大学电气电子与计算机工程学院

出　　处：《传感技术学报》2011年第7期990-995,共6页Chinese Journal of Sensors and Actuators

基　　金：河北省自然科学基金项目(E2008001258)

摘　　要：脉冲漏磁检测技术在铁磁性板材、管道的裂纹、腐蚀等缺陷的检测方面有很大的优势。但是由于腐蚀类缺陷产生的漏磁信号非常微弱,导致常规的对称励磁结构型脉冲漏磁传感器对不同程度的腐蚀缺陷的检测灵敏度不高。为解决这一问题,提出一种新型非对称励磁结构型传感器。并利用有限元分析以及实验的方法验证了新型非对称励磁结构型传感器对无涂覆层以及带涂覆层钢板的腐蚀缺陷都有良好的检测精度,达到了预期的检测效果。Pulsed magnetic flux leakage（PMFL）technique shows potential advantages in the detection of corrosion,cracks and other defects of ferromagnetic plates or pipeline.However,the magnetic flux leakage field of corrosion is so weak that the typical structure of symmetric excitation PMFL sensor is not valuable for the detection of corrosion.To solve the problem,a new structural PMFL sensor with asymmetric excitation structure is introduced in this paper.The results of both the finite element analysis and experiments validate that the new PMFL probe is valuable for detecting the corrosion no matter under coating or not.It achieves the desired detection need.

关 键 词：脉冲漏磁 腐蚀检测 有限元分析 涂覆层 传感器 

分 类 号：TM154.2[电气工程—电工理论与新技术]