【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。更多还原

【Abstract】 In the conventional method of magnetic flux leakage( MFL) testing,the magnetizer is in big volume and with more energy consumption. To solve the problem,a new method of variable excitation MFL testing under the condition of small magnetizer is proposed. First of all,the state of magnetized steel along with the change of the external excitation’s intensity under the condition of small magnetizer is analyzed. Secondly,according to the established model,a new type of testing probe for the variable excitation of MFL is designed and a new implementation scheme is proposed. Furthermore,combining with the implementation scheme,an appropriate testing platform of the variable excitation MFL is set. Finally,a series of physical experiments on the platform are carried out and the results of the experiment were discussed. The experimental results show that the proposed method don’t need to make local saturation magnetization of tested steel plate,which is suitable for the condition of small magnetizer with higher sensitivity. The new method provides a new testing idea for MFL testing field.更多还原