用于木材水分检测的单边核磁共振传感器设计

doi:10.11938/cjmr20172561

波谱学杂志 ›› 2017, Vol. 34 ›› Issue (4): 508-518.doi: 10.11938/cjmr20172561

• 谱仪研制技术进展专栏 • 上一篇下一篇

用于木材水分检测的单边核磁共振传感器设计

余登洁¹, 郭盼², 吴嘉敏¹, 贺玉成¹, 徐征¹

1. 重庆大学电气工程学院, 输配电装备及系统安全与新技术国家重点实验室, 重庆 400044;
2. 重庆师范大学物理与电子工程学院, 重庆 401331

收稿日期:2017-02-13 修回日期:2017-10-26 出版日期:2017-12-05 发布日期:2017-11-29
通讯作者: 徐征,Tel:13527475882,E-mail:xuzheng@cqu.edu.cn E-mail:xuzheng@cqu.edu.cn
基金资助:
国家自然科学基金资助项目（51677008）.

A Unilateral Nuclear Magnetic Resonance Sensor for Nondestructive Wood Moisture Measurements

YU Deng-jie¹, GUO Pan², WU Jia-min¹, HE Yu-cheng¹, XU Zheng¹

1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China;
2. College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China

Received:2017-02-13 Revised:2017-10-26 Online:2017-12-05 Published:2017-11-29

摘要/Abstract

摘要： 为了实现对木材水分的无损检测，设计了一种单边核磁共振（unilateral nuclear magnetic resonance，UMR）传感器，该传感器由单边磁体、抗涡流板、射频线圈、阻抗匹配和调谐电路构成．在距离传感器表面上方75 mm处的50 mm×50 mm的平面内，建立了71.1 mT（共振频率为3.027 MHz）的静态磁场．本文详细介绍了该传感器的设计思路和实现方法，并开展了初步的木材水分无损测量实验．对圆柱形树桩的径向水分分布进行了一维扫描测量，观察了水分由树皮向树芯逐步深入过程中横向弛豫时间（T₂）的变化规律，还使用UMR仪对木材干燥过程中水分的挥发进行了测量.实验结果表明，随着干燥的加剧，被测样品T₂谱的长T₂波峰明显左移、积分面积渐减，而且积分面积与木材样品含水率呈正比．本文为木材研究提供了一种便携的NMR测量设备设计方案，且可以实现野外活体树木的无损测量．

关键词: 单边核磁共振(UMR), 传感器, 木材, 水分, 无损检测

Abstract: An unilateral nuclear magnetic resonance (UMR) sensor was designed to measure wood moisture nondestructively. The sensor consisted of a unilateral magnet, an anti-eddy current module, a radiofrequency (RF) coil and an impedance matching and tuning circuit. The sensor produced a static magnetic field of 71.1 mT (resonant frequency:3.027 MHz) in a 50 mm×50 mm plane locating 75 mm above the sensor's surface. Preliminary nondestructive measurement of wood moisture was carried out with the sensor. The moisture distribution in the radical direction of a cylindrical wood sample was scanned. Variations in transverse relaxation time (T₂) from the bark to core were obtained. Evaporation of moisture during wood drying was also measured with the UMR sensor. Experimental results showed that:the peak of long T₂ component in the T₂ spectrum moved to left and the peak integral area decreased gradually during drying. The integral area was proportional to the moisture content of the sample. The work presents a portable UMR device for wood research which may potentially be used for nondestructive moisture measurement on living trees in situ.

Key words: unilateral nuclear magnetic resonance (UMR), sensor, wood, moisture, non-destructive detection

中图分类号:

余登洁, 郭盼, 吴嘉敏, 贺玉成, 徐征. 用于木材水分检测的单边核磁共振传感器设计[J]. 波谱学杂志, 2017, 34(4): 508-518.

YU Deng-jie, GUO Pan, WU Jia-min, HE Yu-cheng, XU Zheng. A Unilateral Nuclear Magnetic Resonance Sensor for Nondestructive Wood Moisture Measurements[J]. Chinese Journal of Magnetic Resonance, 2017, 34(4): 508-518.

参考文献

[1]中国木材标准化委员会.LY/T 1068-2002锯材窑干工艺规程[M].北京:中国标准出版社,2002. [2]东北林业大学.GB/T 6491-1999锯材干燥质量[M].北京:中国标准出版社,1999. [3]中国木材标准化委员会.GB 1931-91木材含水率测定方法[M].北京:中国标准出版社,1991. [4]ZHOU Y D.The measurement of wood moisture content and analysis of its influence factors[J].China Wood Industry,2000,14(5):29-30.周永东.木材含水率测量方法及影响因素分析[J].木材工业,2000,14(5):29-30. [5]MA X C,LIANG F.Summarization of detection method for wood contains moisture[J].Metrology&Measurement Technique,2010,37(4):82-84.马晓春,梁芳.木材含水分检测方法概述[J].计量与测试技术,2010,37(4):82-84. [6]ZENG Q Y,BAO X R.The comparison research of methods for determination of moisture content of wood[J].China Wood Industry,1990,4(2):20-23,40.曾其蕴,鲍贤镕.木材含水率测定方法的比较研究[J].木材工业,1990,4(2):20-23,40. [7]YIN X Y.Measurement of true wood resistance[J].Journal of Nanjing Forestry University,1988,1:91-95.殷祥源.木材真实电阻的测量[J].南京林业大学学报,1988,1:91-95. [8]YU Y,ZHANG H X.The measurement method of wood moisture and its application[J].Analytical Instrumentation,1999,3:51-55.于洋,张宏勋.木材水分测量方法及其应用[J].分析仪器,1999,3:51-55. [9]MENG Q X,LIU S G.Progress&application of wood moisture measurement systems[J].Forestry Machinery&Woodworking Equipment,2008,36(6):4-7.孟庆鑫,刘少刚.木材含水率检测系统的发展与应用[J].林业机械与木工设备,2008,36(6):4-7. [10]NANASSY A J.Ture dry-mass and moisture content of wood by NMR[J].Wood Sci,1976,9(2):104-109. [11]NANASSY A J.Use of wide line NMR for measurement of moisture content in wood[J].Wood Sci,1973,5(3):187-193. [12]GIANA A,STÉPHANÉ G,ROGER E H.A NMR study of water distribution in hardwoods at several equilibrium moisture contents[J].Wood Sci Technol,2007,41(4):293-307. [13]MACMILLAN B,VELIYULIN E,LAMASON C,et al.Quantitative magnetic resonance measurements of low moisture content wood[J].Can J Forest Res,2011,41(11):2158-2162. [14]SUN B H,WANG X M.Research on the moisture state and mobility in wood during microwave drying by LF-NMR[J].Journal of Inner Monggolia Agricultural University.2012,33(3):205-210.孙丙虎,王喜明.利用低场核磁共振技术研究木材微波干燥过程中的水分状态与迁移[J].内蒙古农业大学学报,2012,33(3):205-210. [15]ZHANG M H,LI X Y,ZHOU Y J,et al.Water status change in wood drying studied by time-domain NMR[J].Scientia Silvae Sinicae.2014,50(12):109-113.张明辉,李新宇,周云洁,等.利用时域核磁共振研究木材干燥过程水分状态变化[J].林业科学,2014,50(12):109-113. [16]ZHOU F Y,CHEN B W,MIAO P.Analysis of the moisture movement during microwave drying of lumber using NMR technology[J].Journal of Anhui Agricultural University,2015,42(1):45-49.周方赟,陈博文,苗平.核磁共振技术在分析木材微波干燥过程中水分移动的应用[J].安徽农业大学学报,2015,42(1):45-49. [17]LIU Y S,ZHANG M H,GUAN M J.A NMR study on wood moisture sorption[J].Journal of Forestry Engineering,2016,1(2):49-53.刘源松,张明辉,关明杰.木材吸湿水分变化的核磁共振分析[J].林业工程学报,2016,1(2):49-53. [18]GUO P,HE W,JUAN C,et al.Degradation of phosphate ester hydraulic fluid in power station turbines investigated by a three-magnet unilateral magnet array[J].Sensor,2014,14:6797-6805. [19]XU Z,CHENG J Y,WU J M,et al.Non-destructive aging detection method for silicone rubber insulator shed based on unilateral NMR principle[J].Proceedings of the CSEE,2014,34(36):6545-6553.徐征,程江艳,吴嘉敏,等.用于复合绝缘子伞裙老化无损检测的单边核磁共振方法[J].中国电机工程学报,2014,34(36):6545-6553. [20]XU Z,MENG K K,CHENG J Y.Highly uniform single-sided portable NMR sensor and its application in assessing the aging level of silicone rubber insulators[J].Int J Appl Electrom,2015,47:777-790. [21]XU Z,WU J M.A portable unilateral nuclear magnetic resonance sensor used for detecting the aging status of composite insulator[J].Transactions of China Electrotechnical Society,2016,31(12):118-125.徐征,吴嘉敏.用于复合绝缘子伞裙老化无损检测的单边核磁共振传感器[J].电工技术学报,2016,31(12):118-125. [22]XU Z,CUI X J,MENG K K,et al.Novel unilateral NMR sensor for assessing the aging status of silicone rubber insulator[J].IEEE Sens J,2015,16(5):1168-1175. [23]PERLO J,CASANOVA F,BLÜMICH B.Profiles with microscopic resolution by single-sided NMR[J].J Magn Reson,2005,176(1):64-70. [24]孟凯凯.恒定梯度单边核磁共振传感器设计与应用研究[D].重庆:重庆大学,2015. [25]郭盼.便携式全开放核磁共振关键技术基础和应用研究[D].重庆:重庆大学,2014. [26]周云洁.基于时域核磁共振技术的木材孔径分布研究[D].呼和浩特:内蒙古农业大学,2015.

用于木材水分检测的单边核磁共振传感器设计

A Unilateral Nuclear Magnetic Resonance Sensor for Nondestructive Wood Moisture Measurements

PDF

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 9

编辑推荐

Metrics

本文评价

[1]	刘社民, 叶强, 黄桥林, 盛从兵, 冯盼增, 李俊防, 吴嘉敏, 徐征. 弧形核磁共振传感器设计及其在复合绝缘子老化状态检测中的应用[J]. 波谱学杂志, 2017, 34(2): 223-230.
[2]	高玉磊, 李新宇, 雷鹏, 张明辉. 利用TD-NMR技术研究杨木高温干燥过程水分分布[J]. 波谱学杂志, 2016, 33(3): 479-490.
[3]	高玉磊, 张明辉. 基于时域核磁共振技术的木材吸湿过程研究[J]. 波谱学杂志, 2016, 33(2): 295-304.
[4]	苗志英, 汪红志, 陈珊珊, 张凯威. 全开放式单边核磁共振探测器及其应用[J]. 波谱学杂志, 2016, 33(2): 305-326.
[5]	高鑫，庄寿增*. 利用核磁共振测定木材吸着水饱和含量 [J]. 波谱学杂志, 2015, 32(4): 670-677.
[6]	郭盼1，籍勇亮2，何为1，徐征1*. 一种测量大型原木内部水分的微型NMR 传感器 [J]. 波谱学杂志, 2015, 32(4): 678-687.
[7]	魏淑怡，潘韻如，曾天生，陈金榜*. 克雷伯氏肺炎杆菌内抗亚碲酸盐蛋白质TerZ 延伸环降低对钙离子亲合性[J]. 波谱学杂志, 2015, 32(2): 308-317.
[8]	马大燕, 王喜明, 张明辉. 核磁共振研究木材吸着过程中水分吸附机理[J]. 波谱学杂志, 2011, 28(1): 135-141.
[9]	吴宏文, 黄良平. 以q空间法研究水分子在水晶体中之扩散及其结构[J]. 波谱学杂志, 1995, 12(4): 347-356.