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| 100 | 1 | _ | |a Huang, Xiaolei |0 P:(DE-Juel1)128697 |b 0 |
| 245 | _ | _ | |a Sensor Configuration and Algorithms for Power-Line Interference Suppression in Low Field Nuclear Magnetic Resonance |
| 260 | _ | _ | |a Basel |c 2019 |b MDPI |
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| 520 | _ | _ | |a Low field (LF) nuclear magnetic resonance (NMR) shows potential advantages to study pure heteronuclear J-coupling and observe the fine structure of matter. Power-line harmonics interferences and fixed-frequency noise peaks might introduce discrete noise peaks into the LF-NMR spectrum in an open environment or in a conductively shielded room, which might disturb J-coupling spectra of matter recorded at LF. In this paper, we describe a multi-channel sensor configuration of superconducting quantum interference devices, and measure the multiple peaks of the 2,2,2-trifluoroethanol J-coupling spectrum. For the case of low signal to noise ratio (SNR) < 1, we suggest two noise suppression algorithms using discrete wavelet analysis (DWA), combined with either least squares method (LSM) or gradient descent (GD). The de-noising methods are based on spatial correlation of the interferences among the superconducting sensors, and are experimentally demonstrated. The DWA-LSM algorithm shows a significant effect in the noise reduction and recovers SNR > 1 for most of the signal peaks. The DWA-GD algorithm improves the SNR further, but takes more computational time. Depending on whether the accuracy or the speed of the de-noising process is more important in LF-NMR applications, the choice of algorithm should be made |
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| 700 | 1 | _ | |a Dong, Hui |0 0000-0002-6444-1134 |b 1 |e Corresponding author |
| 700 | 1 | _ | |a Tao, Quan |0 P:(DE-Juel1)169638 |b 2 |
| 700 | 1 | _ | |a Yu, Mengmeng |0 P:(DE-HGF)0 |b 3 |
| 700 | 1 | _ | |a Li, Yongqiang |0 P:(DE-HGF)0 |b 4 |
| 700 | 1 | _ | |a Rong, Liangliang |0 P:(DE-HGF)0 |b 5 |
| 700 | 1 | _ | |a Krause, Hans-Joachim |0 P:(DE-Juel1)128697 |b 6 |e Corresponding author |
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| 700 | 1 | _ | |a Xie, Xiaoming |0 P:(DE-HGF)0 |b 8 |
| 773 | _ | _ | |a 10.3390/s19163566 |g Vol. 19, no. 16, p. 3566 - |0 PERI:(DE-600)2052857-7 |n 16 |p 3566 - |t Sensors |v 19 |y 2019 |x 1424-8220 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/864467/files/Invoice_MDPI_sensors-566693_1128.13EUR.pdf |
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