波谱学杂志 ›› 2004, Vol. 21 ›› Issue (3): 337-344.

• 研究论文 • 上一篇    下一篇

便携式岩样核磁共振分析仪磁体的设计

孙威1,  王为民2,  谷长春1,  张研蕾3   

  1. 1.石油天然气集团公司中国科学院渗流力学研究所,  河北 廊坊 065007; 
    2.北京大学 量子信息与测量教育部重点实验室, 北京 100871; 
    3.华北石油管理局 第一钻井工程公司科技中心,河北 廊坊 065007
  • 收稿日期:2004-02-19 修回日期:2004-04-29 出版日期:2004-09-05 发布日期:2004-09-05

DESIGN OF A MAGNET USED IN A PORTABLE NMR ROCK ANALYZER

 SUN Wei1, WANG Wei-Min2, GU Chang-Chun1, ZHANG Yan-Lei3   

  1. 1.Institute of porous Flow and Fluid Mechanics,  CNPC and the Chinese Academy of Sciences, Langfang 065007, China;  2.Quantum information and measurement Key Laboratory the Ministry of Education Peking University, Beijing 100871, China; 3.No.1 Drilling Engineering Co. of Huabei Petroleum Administration Bureau CNPC, Langfang 065007, China
  • Received:2004-02-19 Revised:2004-04-29 Online:2004-09-05 Published:2004-09-05

摘要:

核磁共振中的磁体设计有许多方案,但是要使磁体体积小、重量轻、均匀区大、稳定性好,将面临一系列的问题. 而这些问题的解决主要依赖于电磁场计算. 文中首先阐述这些问题,然后对方案进行优化分析计算,从中找出一个最佳的解决方案. 采用本方案研制出来磁体,我们研制成功了便携式核磁共振岩样分析仪. 经过多次的现场实验测试表明由该磁体构成的磁共振岩样分析仪的稳定性高、重复性好、满足现场恶劣的环境要求.

关键词: 核磁共振, 永磁磁体, 电磁场, 稳定性, 重复性

Abstract:

There are many ways of design for the magnets used in nuclear magnetic resonance. However,  it is always challenging to make the magnet small, light, stable and having large volume with uniform magnetic field. Solution to this challenge lies in accurate computation of the electromagnetism field. In this paper, we first briefly reviewed the problems in magnet design, and then showed how to optimize the different ways of magnet design. An optimized magnet design was proposed, based on which a portable NMR cock analyzer was built successfully. The results from a number of on site tests showed that the portable NMR rock analyzer we built has high stability and good reproducibility, and is suitable for working under severe conditions.

Key words: NMR, permanent magnet, electromagnetic field, stability, reproducibility

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