| 低场核磁共振射频场屏蔽效能的计算与研究 |
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| 引用本文： | 陈海永,张一鸣,陈继忠. 低场核磁共振射频场屏蔽效能的计算与研究[J]. 分析仪器, 2006, 0(1): 18-21 |
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| 作者姓名： | 陈海永 张一鸣 陈继忠 |
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| 作者单位： | 1. 中国科学院研究生院,北京,100080;中国科学院电工研究所,北京,100080
2. 中国科学院电工研究所,北京,100080 |
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| 摘 要： | 采用有限元方法计算了圆柱形屏蔽体的屏蔽效能和屏蔽体对螺线管内部磁场的影响，得到屏蔽效能和螺线管内部磁场随屏蔽体尺寸变化的曲线。并用Matlab对球形屏蔽体的屏蔽效能进行了计算，二者基本一致。结果表明，屏蔽效能随圆柱体半径的增加而缓慢增加，随圆柱体厚度的增加而迅速增加，但是当厚度大于1．5mm以后，几乎保持不变。
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| 关 键 词： | 核磁共振 电磁场 屏蔽效能 圆柱形屏蔽体 球形屏蔽体 |
| 收稿时间： | 2005-10-26 |
| 修稿时间： | 2005-10-26 |
Calculation and research of shielding effectiveness of radio frequency field in low field nuclear magnetic resonance |
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| Chen Haiyong,Zhang Yiming,Chen Jizhong. Calculation and research of shielding effectiveness of radio frequency field in low field nuclear magnetic resonance[J]. Analytical Instrumentation, 2006, 0(1): 18-21 |
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| Authors: | Chen Haiyong Zhang Yiming Chen Jizhong |
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| Affiliation: | 1. Graduate School of Chinese Academy of Sciences, Beijing 100080; 2. Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing, 100080 |
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| Abstract: | The shielding effectiveness of cylindrical shield and the influence of the shield on the magnetic field in the solenoid are calculated by using finite element method. The curves of the shielding effectivencess and magnetic field in the solenoid against the shield dimension are obtained. The shielding effectiveness of spherical shield is calculated also with Matlab for comparision. The results of two types of shields are in good agreement. It is shown that the shielding effectiveness increases slowly with the increase of the radius of the shield and increases rapidly with the increase of the thickness of the shield, but it keeps almost unchanged after the thickness is larger than 1.5 mm. |
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