Measurement of the surface field on open magnetic samples by the extrapolation method
Measurement of the surface field on open magnetic samples by the extrapolation method
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DOI：
10.1063/1.2084367
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发表时间：
2005-10-01
影响因子：
1.6
通讯作者：
Perevertov, O
中科院分区：
文献类型：
--
作者：
Perevertov, O
开放磁性样品中磁场的测定是一个非常困难的问题。存在两种基本方法-从施加的电流计算场或在样品表面附近测量场。两者都取决于样品-磁轭接触的质量，而样品-磁轭接触的质量会影响电路磁阻和样品上方的场梯度。在这项工作中，一种方法的表面场确定外推从现场测量在不同的距离从表面进行了研究。对单个C型磁轭系统在不同磁性样品上的场行为进行了数值和实验研究。确定了驱动线圈位置、磁轭尺寸、气隙和样品材料对磁场梯度的影响。讨论了影响结果精度的主要因素。通过比较结果的导数，即，测量不同气隙的微分磁导率曲线。(c)2005年美国物理学会。
Determination of the magnetic field in open magnetic samples is a very difficult problem. Two basic approaches exist - to calculate the field from the applied current or to measure it near the sample surface. Both depend on the quality of sample-yoke contacts that affect the circuit reluctance and the field gradient above the sample. In this work, a method of the surface field determination by extrapolation from the field measurements at different distances from the surface is investigated. The field behavior above the sample is studied for a single C-yoke system numerically and experimentally on magnetically different samples. The influence of the driving coil position, yoke size, air gap, and the sample material on the field gradient is determined. The main factors affecting the resulting accuracy are discussed. The applicability of the method was checked by comparing derivatives of the results, i.e., differential permeability curves measured for different air gaps. (c) 2005 American Institute of Physics.