磁性物体磁偶极子模型适用性的试验研究  

Experiment Research of Magnetic Dipole Model Applicability for a Magnetic Object

作　　者：张朝阳[1] 肖昌汉[1] 高俊吉[1] 周国华[1] 

机构地区：[1]海军工程大学电气与信息工程学院,湖北武汉430033

出　　处：《应用基础与工程科学学报》2010年第5期862-868,共7页Journal of Basic Science and Engineering

摘　　要：磁偶极子模型是一种简单却有着广泛应用的磁性模型,尤其在磁性目标探测领域有着广泛的应用.针对磁偶极子模型的应用仅仅凭经验和对模型的应用原理没有清晰认识的情况,提出了利用试验研究得到模型应用条件的思路.在近场磁场测量的基础上,建立了通过考察等效磁矩收敛性和磁场相对误差得到磁偶极子模型适用条件的试验研究方法.在理论分析的基础上,对5种不同的磁性物体模型进行了试验研究.试验结果表明,在2.5倍物体长度以上的空间,磁性物体的等效磁矩收敛,并且磁场相对误差很小,可以把磁性物体视作磁偶极子处理,能够满足工程上的要求,为磁偶极子模型的合理应用提供了依据.Magnetic dipole model is one simple but applied broadly magnetic model,and especially applied broadly in the magnetic detecting field.According to the case that the application of the model is only by rule of thumb and the application principle isn＇t known clearly,the thought of getting the magnetic dipole model application condition by experiment research was proposed.Based on the near field measurement,according to testing the astringency of equivalent magnetic moments and the relative error of magnetic field,a research method of getting magnetic dipole model application condition was found.Based on the theory analysis,5 different magnetic object mockups were chosen for the experiment,and the results had indicated that beyond 2.5 times object length,the equivalent magnetic moments were convergent and the magnetic relative error was very small,which made clear that beyond 2.5 times object length,a magnetic object could be dealt with as a magnetic dipole and the demand of engineering could be satisfied.The result supplies basis for the magnetic dipole model＇s reasonable application.

关 键 词：磁性物体 磁偶极子 等效磁矩 适用条件 

分 类 号：P631[天文地球—地质矿产勘探]