A Wide-Band Matching Method for Radio Frequency Coils Used in Soil Moisture Measurement

doi:10.11938/cjmr20202877

Abstract

Abstract:

Accurate measurement of soil moisture is crucial in agricultural water management. A mini inside-out nuclear magnetic resonance (NMR) sensor has been designed to measure the moisture in model soils, consisting of three cylindrical magnets magnetized in the axial direction and four arc spiral coils with the same size in series. A circumferential symmetric constant gradient field can be obtained by adjusting the radius and height between the cylinders. To improve the signal-to-noise ratio of the sensor, this a wide-band matching method was proposed in this work to expand the excitation region of the radio frequency coils. The Carr-Purcell-Meiboom-Gill (CPMG) signal was analyzed through inverse Laplace transformation. With the results obtained, moisture content of the sample was found to be positively correlated with the integral area of T₂ spectrum peak, verifying the feasibility of the sensor in soil moisture measurement.

Key words: agriculture, soil moisture, nuclear magnetic resonance (NMR), wide-band matching

CLC Number:

O482.53

Jia-min WU,Yu-cheng HE,Zheng XU,Yan-he ZHU,Wen-zheng JIANG. A Wide-Band Matching Method for Radio Frequency Coils Used in Soil Moisture Measurement[J]. Chinese Journal of Magnetic Resonance, 2021, 38(3): 414-423.

Figures/Tables 11

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

References 17

1	SUCRE O , POHLMEIER A , MINIÈRE A , et al. Low-field NMR logging sensor for measuring hydraulic parameters of model soils[J]. J Hydrol, 2011, 406 (1-2): 30- 38. doi: 10.1016/j.jhydrol.2011.05.045
2	ALVARADO R J , DAMGAARD A , HANSEN P , et al. Nuclear magnetic resonance logging while drilling[J]. Oilfield Rev, 2003, 15 (2): 40- 51.
3	BLÜMICH B , PERLO J , CASANOVA F . Mobile single-sided NMR[J]. Prog Nucl Mag Res Sp, 2008, 52 (4): 197- 269.
4	BEHROOZMAND A A , KEATING K , AUKEN E . A Review of the principles and applications of the NMR technique for near-surface characterization[J]. Surv Geophys, 2015, 36 (1): 27- 85. doi: 10.1007/s10712-014-9304-0
5	BLANK A , ALEXANDROWICZ G , MUCHNIK L , et al. Miniature self-contained intravascular magnetic resonance (IVMI) probe for clinical applications[J]. Magn Reson Med, 2005, 54 (1): 105- 112. doi: 10.1002/mrm.20537
6	COOPER R K , JACKSON J A . Remote (inside-out) NMR. Ⅰ. Remote production of a region of homogeneous magnetic field[J]. J Magn Reson, 1980, 41 (3): 406- 410.
7	JACKSON J A , BUMETT L J , HARMON J F . Remote (inside-out) NMR. Ⅲ. Detection of nuclear magnetic resonance in a remotely produced region of homogeneous magnetic field[J]. J Magn Reson, 1980, 41 (3): 411- 421.
8	TAICHER Z, SHTRIKMAN S. Nuclear magnetic resonance sensing apparatus and techniques. US. 417878[P], 1988-01-05.
9	KLEINBERG R L , SEZGINER A , GRIFFIN D D , et al. Novel NMR Apparatus for investigating an external sample[J]. J Magn Reson, 1992, 97 (3): 466- 485.
10	PERLO J , DANIELI E , PERLO J , et al. Optimized slim-line logging NMR tool to measure soil moisture in situ[J]. J Magn Reson, 2013, 233 (Complete): 74- 79.
11	MARBLE A E , MASTIKHIN I V , COLPITTS B G , et al. A compact permanent magnet array with a remote homogeneous field[J]. J Magn Reson, 2007, 186 (1): 100- 104. doi: 10.1016/j.jmr.2007.01.020
12	GUO P , HE W , JUAN C , et al. A new inside-out nuclear magnetic resonance sensor-Three-cylinder array[J]. Trans China Electrotech Soc, 2016, 31 (8): 96- 101. doi: 10.3969/j.issn.1000-6753.2016.08.012
	郭盼, 何为, JUANC, 等. 一种新型Inside-Out核磁共振传感器——三圆柱磁体阵列[J]. 电工技术学报, 2016, 31 (8): 96- 101. doi: 10.3969/j.issn.1000-6753.2016.08.012
13	吴嘉敏. 土壤水分的磁共振测量方法基础研究[D]. 重庆: 重庆大学, 2019.
14	JACKSON J D . Classical Electrodynamics[M].3rd ed New York: John Wiley & Sons Inc, 1999.
15	WATZLAW J , GLÖGGLER S , BLÜMICH B , et al. Stacked planar micro coils for single-sided NMR applications[J]. J Magn Reson, 2013, 230, 176- 185. doi: 10.1016/j.jmr.2013.02.013
16	WU J , GUO P , SHEN S , et al. Mini inside-out nuclear magnetic resonance sensor design for soil moisture moasurements[J]. Sensors, 2019, 19 (7): 1682. doi: 10.3390/s19071682
17	CHELCEA R I , FECHETE R , CULEA E , et al. Distributions of transverse relaxation times for soft-solids measured in strongly inhomogeneous magnetic fields[J]. J Magn Reson, 2009, 196 (2): 178- 190. doi: 10.1016/j.jmr.2008.11.004

[1]	Chong-wu WANG,Xi HUANG,Lei SHI,Shi-zhen CHEN,Xin ZHOU. Cathepsin B Triggered Hyperpolarization ¹²⁹Xe MRI Probe for Ultra-Sensitive Lung Cancer Cells Detection [J]. Chinese Journal of Magnetic Resonance, 2021, 38(3): 336-344.
[2]	Zi-hao WANG,He XU,Tao WANG,Shan-zhong YANG,Yun-sheng DING,Hai-bing WEI. NMR Spectroscopic Studies on (exo, endo) C-2 Monosubstituted Norbornene Derivatives [J]. Chinese Journal of Magnetic Resonance, 2021, 38(3): 323-335.
[3]	Xin-yi ZHAO,Dong HAN,Hong-jun LUO,Wen-bin SHEN,Gong-jun YANG. Spectroscopic Studies of Delafloxacin Meglumine [J]. Chinese Journal of Magnetic Resonance, 2021, 38(2): 268-276.
[4]	Xiao-wen CHEN,Bi-ling HUANG,Shao-hua HUANG,Yu-fen ZHAO. An NMR Study on the clpC Operon Binding Region of Transcription Factor CtsR from Bacillus subtilis [J]. Chinese Journal of Magnetic Resonance, 2021, 38(2): 155-163.
[5]	Yi LI,Jia-xiang XIN,Jia-chen WANG,Da-xiu WEI,Ye-feng YAO. Preparation Efficiency of Nuclear Spin Singlet State: A Comparison Among Three Pulse Sequences [J]. Chinese Journal of Magnetic Resonance, 2021, 38(2): 227-238.
[6]	Jin-bo YU,Cai ZHANG,Ze-ting ZHANG,Guo-hua XU,Cong-gang LI. Interactions Between α-synuclein and Intact Mitochondria Studied by NMR [J]. Chinese Journal of Magnetic Resonance, 2021, 38(2): 164-172.
[7]	Wei ZHANG,Yi-ming WU,Wei-ping CUI,Liang XIAO. Correction for the Nuclear Magnetic Resonance Porosity in Heavy Oil-bearing Reservoirs [J]. Chinese Journal of Magnetic Resonance, 2021, 38(2): 204-214.
[8]	Kun MENG,Sheng-jian WANG,Zong-an XUE,Rui-qing HOU,Liang XIAO. Quantitative Evaluation of Shale Pore Structure Using Nuclear Magnetic Resonance Data [J]. Chinese Journal of Magnetic Resonance, 2021, 38(2): 215-226.
[9]	Zhi-wu ZHANG,Ju YANG,Ze-feng NIE,Shang-xiang YE,Xu DONG,Chun TANG. Development of a Temperature Senor Based on ¹⁹F-labeled Phosphorylated Ubiquitin [J]. Chinese Journal of Magnetic Resonance, 2021, 38(2): 173-181.
[10]	LIAO Huai-yu, HAN Hong-yuan, CHEN Fei, ZHANG Hai-yan, YANG Jing, ZHAO Tian-zeng. An NMR Study on Two New β-Dihydroagrofuran Compounds in Celastrus angulatus Maxim [J]. Chinese Journal of Magnetic Resonance, 2021, 38(1): 101-109.
[11]	WANG Rui-di, XU Bei-bei, SONG Yan-hong, WANG Xue-lu, YAO Ye-feng. Methanol-Water Interaction in Photocatalytic Methanol Reforming ─ An Operando NMR Study [J]. Chinese Journal of Magnetic Resonance, 2021, 38(1): 43-57.
[12]	KE Han-ping, CAI Hong-hao. High-Resolution Localized NMR Spectroscopy Based on Hadamard-Encoding [J]. Chinese Journal of Magnetic Resonance, 2020, 37(4): 524-532.
[13]	LIU Si, AN Yan-peng, TANG Hui-ru. Effects of Lyophilization on the Metabonomic Phenotypes of Human Biofluids Characterized with NMR Analysis [J]. Chinese Journal of Magnetic Resonance, 2020, 37(4): 484-489.
[14]	LI Ying-jun, YANG Hong-jing, LIU Ji-hong, JIN Kun, LIN Le-di, LIU Xue-jie. Assignments of NMR Spectral Data of a Novel Carbazole-Triazinoindole Based N-Acylhydrazone Derivative [J]. Chinese Journal of Magnetic Resonance, 2020, 37(4): 496-504.
[15]	ZHAN Jia-ying, TU Zhang-ren, DU Xiao-feng, YUAN Bin, GUO Di, QU Xiao-bo. Progresses on Low-Rank Reconstruction for Non-Uniformly Sampled NMR Spectra [J]. Chinese Journal of Magnetic Resonance, 2020, 37(3): 255-272.