Chinese Journal of Magnetic Resonance ›› 2017, Vol. 34 ›› Issue (3): 372-382.doi: 10.11938/cjmr20172569

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Design of Magnets for in Situ NMR Detection Devices Intended for Preservation of Ancient Architectures

SUN Zhe1,2, XIAO Li-zhi1,3, LIAO Guang-zhi1, ZHANG Yan1, TANG Lian2, XIANG Wen-feng2, LIU Hua-bing4, ZHOU Hua5, CHEN Wei-liang1, WANG Jie1, ZHAO Kun2   

  1. 1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
    2. College of Science, China University of Petroleum, Beijing 102249, China;
    3. Harvard SEAS-CUPB Joint Laboratory on Petroleum Science, Cambridge MA 02138, USA;
    4. Beijing Limecho Technology Limited Company, Beijing 102299, China;
    5. College of Applied Arts and Science of Beijing Union University, Beijing 100191, China
  • Received:2017-03-20 Revised:2017-07-14 Online:2017-09-05 Published:2017-09-05

Abstract: Ancient architectures such as the Great Wall are symbols and pride of the Chinese nation, and precious treasures of the world. Portable NMR detection devices have been proposed to examine the building materials of such ancient architectures non-invasively, and to provide information regarding the science, technology and engineering behind these architectures. In this study, the magnets for such portable NMR detection devices were designed and built, which were all based on a semi-Halbach magnet structure. On top of the basic design, different modules were added to achieve different functionality, including the magnet for mobile measurement, the magnet for high depth measurement, and the "homogeneous" field mode. The measured magnetic field (B0) distributions for these magnets agreed well with the simulated results, with only slight differences. Experiments on bricks were performed to verify the performance of these magnets.

Key words: NMR, single-sided, magnetic field, magnet

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