A Discussion on the Errors for the in Situ Magnetic Measurements in Hydrostatic High Pressure Vessel (2)-The Influence of Demagnetic Field
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摘要: 为了探讨流体静高压原位磁测量中退磁场的影响有多大?分别选用6种不同片数(n=1、3、5、7、10、13)的非晶Fe46.3Co0.03Ni46.5Si3.75V0.92B2.5合金薄带样品,先后放进13层密绕直螺线管初级线圈内,采用工业频率400 Hz去测量和比较其磁化曲线、磁导率曲线和起始磁化曲线。研究表明:(1)样品片数越多,退磁场的影响越大,导致m和i出现惊人的测量误差,以1片(m=4 430,i=3 396)为最准。(2)随着样品片数的增多,测量饱和磁感应强度Bs=0.837~0.762T,表明受退磁场影响较小。(3)若要减小退磁场误差,可将样品做得更薄,如0.2 m薄膜。(4)若要彻底消除退磁场误差,必须采用闭合磁路,如用非晶合金薄带卷成的圆环。Abstract: To study the influence of demagnetic field in the hydrostatic high pressure vessel, we selected 6 samples with different slice-number (n=1, 3, 5, 7, 10, 13) of amorphous alloy Fe46.3Co0.03Ni46.5Si3.75V0.92B2.5 ribbon, inserted them into multiple electric solenoid and measured the magnetization, magnetic permeability and initial magnetization, respectively, at 400 Hz. We found that: (1) The more the slices of sample, the stronger the influence of demagnetic field was, which leaded in surprising errors of m and i. For the sample with 1 slice, we obtained the optimal values, m=4 430, i=3 396. (2) With the increase of slice number (n=1~13), we measured saturation magnetic induction Bs=0.837~0.762T, indicating the influence of demagnetic field on Bs was much small. (3) To reduce the error from demagnetic field, thinner sample could be used, for example thin film with 0.2 m thick. (4) To eliminate the error from demagnetic field, closed magnetic circuit must be adopted, such as ring rolled up by amorphous alloy ribbon.
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Wisniewski R, et al. Journal of Magnetism and Magnetic Materials, 1989, 81: 121. 苏昉, 苏骏, 许伟. 高压物理学报, 1993, 7(1): 11-22. 苏昉, 黄丁. 髙压物理学报, 1993, 7(3): 191-201. 苏昉. 高压物理学报, 1998, 12(1): 8 赵凯华, 陈熙谋. 电磁学(下册). 北京: 人民教育出版社, 1979: 101, 103.
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