共查询到20条相似文献,搜索用时 140 毫秒
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光磁共振测量地磁场水平分量方法评述与改进 总被引:1,自引:0,他引:1
比较了在光磁共振实验中不加射频场、固定射频场、改变射频场3类测量地磁场水平分量的实验方法.提出利用反向测量、线性拟合等方法进行改进,一定程度上克服了原来实验方法的缺点. 相似文献
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介绍了磁阻传感器的实验原理,用计算机origin软件对实验数据进行曲线拟合,拟合结果与传统最小二乘法处理数据相吻合。计算了霍尔灵敏度和西安市区地磁场的大小,误差较小。 相似文献
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交变磁场下法拉第效应研究 总被引:4,自引:0,他引:4
介绍了交变法拉第效应的磁光调制测量原理和方法,分析了亚铁磁材料法拉第Fraday效应和磁光调制深度与交变磁场频率间的关系,证明了交变法拉第旋转幅值θ0的实部θ0小于静磁场下的θ's,而虚部θ''0大于θ''s,理论和实验结果相吻合,由此得出结论,采用具有磁圆二向色性的磁光材料做成的调制器不可能达到彻底的开关状态。 相似文献
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用计算机模拟的方法研究了地磁场中带电粒子的运动特性,绘制了粒子轨迹曲线,对粒子运动进行了分析,解释了地磁场的磁瓶效应和辐射带. 相似文献
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Li-Xing Chen 《中国物理 B》2022,31(12):125203-125203
The HT-6M tokamak at the Thailand Institute of Nuclear Technology has been restarted. In order to ensure the smooth breakdown of plasma and obtain plasma discharge parameters, optimization of the poloidal field coils and upgrade of the magnetic diagnostics are described in this article. A perfect null field (stray field in the main chamber < 10 G) is obtained using an ohmic heating field. To obtain important information about the plasma, an external magnetic diagnostics system is designed and calibrated, including a Rogowski coil (measuring plasma current), a magnetic probe (measuring external field), diamagnetic loops (measuring βp) and so on. In order to realize high-frequency signal measurement and transmission, a series of frequency responses with the magnetic probe and transmission line are tested. Later, to verify the null field, a fitting code is developed to reconstruct the stray field in the vacuum chamber based on magnetic probe measurements and flux loops. The results show that the error is within 1.5%. This indicates the accuracy of the magnetic measurement system and ensures the preparation for the breakdown of plasma. 相似文献
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