小型磁化器条件下的变励磁MFL检测新方法

发布时间：2018-01-24 19:58

本文关键词： 小磁化器直流偏置磁化交变励磁漏磁场变化率交变漏磁场　出处：《仪器仪表学报》2015年01期 　论文类型：期刊论文

【摘要】：为解决常规储罐和管道的漏磁检测(MFL)方法中磁化器体积大、耗能多的缺点,提出了一种小型磁化器条件下的变励磁MFL检测新方法。首先,分析了小磁化器条件下被测钢板磁化状态随外部励磁强度的变化特性,推导了偏置磁化条件下励磁通变化量与漏磁场变化率的关系模型;其次,根据所建立的关系模型,设计了一种新型变励磁MFL检测探头,并给出变励磁MFL法的系统实现方案;再次,结合实现方案,搭建了变励磁MFL相应的实验平台;最后,在该平台上,开展了一系列的物理实验并对实验结果进行了深入讨论。实验结果表明,所提变励磁MFL法无需对被测钢板进行局部饱和磁化,适合小型磁化器条件并具有较高的灵敏度。变励磁MFL法为漏磁检测领域提供了一种新的检测思路。
[Abstract]:In order to solve the problems of large volume and high energy consumption of magnetizer in the conventional magnetic flux leakage detection (MFL) method for storage tanks and pipelines, a new method of variable-excitation MFL detection under the condition of small magnetizer is proposed. The variation characteristics of the magnetization state of the steel plate measured with the external excitation intensity under the condition of small magnetizer are analyzed, and the relation model between the flux variation and the flux leakage rate under the condition of bias magnetization is derived. Secondly, according to the established relationship model, a new type of variable-excitation MFL detection probe is designed, and the system implementation scheme of variable-excitation MFL method is given. Thirdly, the experiment platform of variable-excitation MFL is built in combination with the implementation scheme. Finally, a series of physical experiments are carried out on the platform and the experimental results are discussed in depth. The experimental results show that the proposed variable-excitation MFL method does not need local saturation magnetization of the steel plate under test. It is suitable for the condition of small magnetizer and has high sensitivity. The variable excitation MFL method provides a new method for magnetic flux leakage detection.
【作者单位】：厦门大学机电工程系;
【基金】：国家自然科学基金(51177141) 中央高校基本科研业务项目(2010121041) 航空基金(2012ZD68003)资助项目
【分类号】：TG115.28
【正文快照】： 1引言在石化工业中,储罐、管道是储存和运送石油、天然气等各种石化产品的主要工具,对国民生活、工农业生产和国防建设都有着举足轻重的作用[1]。然而,因油气输送管道、储罐使用周期过长、腐蚀损坏严重而造成的泄漏事故频发,严重威胁着油气输送和人员的安全,也对环境造成严重

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