共查询到18条相似文献,搜索用时 140 毫秒
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共轴三线圈磁场的均匀性 总被引:4,自引:1,他引:3
给出用平行共轴不等大等电流的三个圆线圈形成匀强磁场的方法.文中给出了三线圈形成匀强磁场的条件,并且通过数值计算全面分析了三线圈磁场的均匀性.与Helmholtz线圈磁场比较显示,三线圈的磁场无论在强度方面,还是在磁场均匀性方面都明显优于Helmholtz线圈的磁场. 相似文献
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亥姆霍兹线圈磁场的均匀性分析 总被引:28,自引:8,他引:20
引入磁场均匀度的概念,对亥姆霍兹线圈磁场的均匀性进行了定量分析,并通过计算机模拟,得出了同一精度下,形成亥姆霍兹线圈均匀磁场的最佳条件. 相似文献
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阐述了亥姆霍兹线圈轴线上磁感应强度高阶导数的奇特性质,提出利用共轴四线圈组产生均匀磁场的设想,并通过模拟共轴四线圈组磁场的轴线分布及空间分布,展现了共轴四线圈组的优越之处. 相似文献
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本文利用IBM—PC计算机时圆电流的磁场和亥姆霍兹线圈(N=1和N=99)的磁场作了精确计算; 给出了亥姆霍兹线圈的磁场系数和相对误差的数据,画出了1%、0.2%和0.02%的磁场均匀区;对影响亥姆霍兹线圈磁场均匀性的几个因素进行了计算和讨论. 相似文献
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Helmholtz线圈、直螺线管及圆电流磁场均匀性分析的简单公式 总被引:30,自引:6,他引:24
采用由 Helm holtz 线圈、直螺线管及圆电流对称轴上的磁场来计算轴外磁场的方法,求得磁场均匀性的简单公式,并对计算结果进行了讨论. 相似文献
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球形线圈磁场均匀性的研究 总被引:1,自引:0,他引:1
研究非密绕球形线圈内部的磁场均匀性质.从圆形电流线圈轴线上的磁场出发,利用叠加原理和Mathematica软件的计算和符号推导功能,得到一个关于线圈内部磁场均匀性与其匝数的定量关系式,在此基础上通过实例说明设计球形线圈磁场均匀区的方法. 相似文献
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V. V. Filatov 《Technical Physics》1997,42(4):415-420
Physical experiments often require the generation of a short-lived magnetic field with specified limits of nonuniformity.
Various energy storage units, specifically capacitor banks, are used to supply pulsed power to the magnetic system. The simplest
configuration of such a magnetic system is formed by two identical coaxial electromagnetic coils. In this work the parameters
of this system configuration are optimized, subject to field uniformity requirements.
Zh. Tekh. Fiz. 67, 101–106 (April 1997) 相似文献
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Low-field nuclear magnetic resonance magnet(2 MHz) is required for rock core analysis. However, due to its low field strength, it is hard to achieve a high uniform B_0 field only by using the passive shimming. Therefore, active shimming is necessarily used to further improve uniformity for Halbach magnet. In this work, an equivalent magnetic dipole method is presented for designing shim coils. The minimization of the coil power dissipation is considered as an optimal object to minimize coil heating effect, and the deviation from the target field is selected as a penalty function term. The lsqnonlin optimization toolbox of MATLAB is used to solve the optimization problem. Eight shim coils are obtained in accordance with the contour of the stream function. We simulate each shim coil by ANSYS Maxwell software to verify the validity of the designed coils. Measurement results of the field distribution of these coils are consistent with those of the target fields.The uniformity of the B_0 field is improved from 114.2 ppm to 26.9 ppm after using these shim coils. 相似文献
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采用级数展开的方法,得到了一般情况下两共轴圆线圈间互感系数的严格无穷级数表达式,所得结果在除两线圈重合之外的所有情况下均是收敛的.并且在计算过程中利用磁矢势而非磁感应强度求出磁通量,使得该方法较为简便. 相似文献
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A. M. Bishaev A. A. Bush M. B. Gavrikov A. I. Denisyuk K. E. Kamentsev M. V. Kozintseva V. V. Savel’ev A. S. Sigov 《Technical Physics》2014,59(6):940-943
We consider the possibility of designing a plasma trap with a magnetic system formed by super-conducting rings and coils levitating in the field of a fixed coaxial coil carrying constant current. An analytic dependence of the potential energy of such a system with one or two levitating superconducting rings having trapped preset magnetic fluxes on their coordinates in the uniform gravitational field is obtained in the thin ring approximation. Calculations performed in the Mathcad system show that equilibrium states of such a system exist for certain values of parameters. Levitating states of a single superconducting ring and two superconducting rings in the field of the coil with constant current are observed experimentally in positions corresponding to calculated values. 相似文献
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在多通道超导量子干涉器件(SQUID)磁探测系统中,磁场电压转换系数(∂ B/∂ V)是系统的一个重要参数由于SQUID器件和读出电路之间不可避免地存在差异性因此对传感器系统进行系统标定(每个通道的单独标定)显得十分重要本文采用(PCB) 板印制圆形线圈对36通道心磁系统进行标定,并与传统的亥姆霍兹方形线圈产生均匀场的标定方法进行比较结果显示PCB圆形线圈的标定结果 在1.46–1.73 pT·mV-1 之间,亥姆霍兹方形线圈标定的结果大都在1.56–1.64 pT·mV-1之间,结果基本一致.
关键词:
超导量子干涉器件
磁探测
磁场-电压转换系数
系统标定 相似文献