[1] Yu Qiaoming, Lu Rongsheng, Chen Lang, Jiang XiaowenWu Zhengxiu, et al. Inversion method for NMR weak signalswith short relaxation time [J]. Journal of Southeast University (English Edition), 2023, 39 (2): 161-168. [doi:10.3969/j.issn.1003-7985.2023.02.007]

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Inversion method for NMR weak signalswith short relaxation time()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

39

Issue:

2023 2

Page:

161-168

Research Field:

Mechanical Engineering

Publishing date:

2023-06-20

Info

Title:

Inversion method for NMR weak signalswith short relaxation time

Author(s):

Yu Qiaoming;  Lu Rongsheng;  Chen Lang;  Jiang XiaowenWu Zhengxiu;  Bao Chong;  Ni Zhonghua

Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China
School of Mechanical Engineering, Southeast University, Nanjing 211189, China
National Key Laboratory of Bioelectronics, Southeast University, Nanjing 211189, China

Keywords:

nuclear magnetic resonance(NMR);  relaxation time;  inversion;  low signal-to-noise ratio(SNR);  cement hydration

PACS:

TH89

DOI:

10.3969/j.issn.1003-7985.2023.02.007

Abstract:

An improved inversion method for nuclear magnetic resonance(NMR)relaxation signals with a low signal-to-noise ratio(SNR)is proposed to solve the inversion problem of weak NMR signals with short relaxation components. This method selects a suitable filter factor for inversion by combining the singular-value decomposition and Tikhonov methods. Compared with existing inversion methods, the relaxation-time spectrum based on the proposed method is closer to the original spectrum of the NMR simulation signal, especially in short relaxation components when the signal is weak. The reliability of the proposed method under different SNRs was proven by calculating the uncertainty of the solutions. The ability to obtain precise relaxation times was proven by experimental measurement and inversion analysis of samples with multiple relaxation components. The changing pattern of the components in a cement-hydration process found by identifying the weak signal with short relaxation components was validated. In conclusion, the proposed inversion method can effectively distinguish a weak NMR signal with short relaxation times, which plays an important role in determining the key components of a sample and in characterizing its physical properties, thus promoting the application of NMR relaxation technology.

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Memo

Memo:

Biographies: Yu Qiaoming(1997—), male, graduate; Lu Rongsheng(corresponding author), male, doctor, professor, lurs@seu.edu.cn.
Foundation items: The National Natural Science Foundation of China(No. 52075098), the National Key Scientific Instrument and Equipment Development Project of China(No. 51627808).
Citation: Yu Qiaoming, Lu Rongsheng, Chen Lang, et al. Inversion method for NMR weak signals with short relaxation time[J].Journal of Southeast University(English Edition), 2023, 39(2):161-168.DOI:10.3969/j.issn.1003-7985.2023.02.007.

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