A compact magnetic resonance system with inside-out sensor for soil moisture measurement

被引:7
|
作者
Wan, Cai [1 ]
He, Wei [1 ]
Guo, Pan [2 ]
Wu, Jiamin [3 ,4 ]
He, Yucheng [3 ,5 ]
Xu, Zheng [1 ]
机构
[1] Chongqing Univ, Sch Elect Engn, Chongqing 400044, Peoples R China
[2] Chongqing Normal Univ, Sch Phys & Elect Engn, Chongqing 401331, Peoples R China
[3] Shenzhen Acad Aerosp Technol, 6 Keji South 10th Rd,Shenzhen C4, Shenzhen 518057, Peoples R China
[4] Harbin Inst Technol, 92 Xi Da Zhi Jie, Harbin 150001, Peoples R China
[5] Northwestern Polytech Univ, Sch Life Sci, Xian 710072, Shanxi, Peoples R China
基金
中国国家自然科学基金;
关键词
compact NMR measuring instrument; soil moisture; transverse relaxation time (T (2)); WATER CONTENT MEASUREMENT; NMR; FIELD; REGION; TOOL;
D O I
10.1088/1361-6501/ac6000
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Accurate measurement of soil moisture parameters plays a vital role in promoting agricultural production. Nuclear magnetic resonance (NMR) measuring instruments have become increasingly compact, especially in low field applications. However, NMR soil moisture measurement instruments still have problems with portability. We report on a compact NMR measuring instrument that focuses on the circuit's design and construction. The instrument includes an inside-out sensor, NMR spectrometer, radio frequency power amplifier, low-noise preamplifier, and duplexer. They are integrated into a slim 3D-printed cylinder. The integrated NMR instrument is portable and user-friendly and can reduce the influence of nonideal factors, such as transmission line effects and electromagnetic interference. We conducted different soil moisture experiments with the prototype using Carr-Purcell-Meiboom-Gill pulse sequence to obtain the corresponding transverse relaxation time (T (2)) decay curves. Then, the T (2) 1D spectrum distributions were obtained by inverse Laplace transformation. Finally, the results reveal that the area of long T (2) component decreases as the soil moisture content decreases.
引用
收藏
页数:13
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