Journal Article

FZJ-2019-04248

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Sensor Configuration and Algorithms for Power-Line Interference Suppression in Low Field Nuclear Magnetic Resonance

Huang, X.FZJ* ; Dong, H. (Corresponding author) ; Tao, Q. ; Yu, M. ; Li, Y. ; Rong, L. ; Krause, H.-J. (Corresponding author)FZJ* ; Offenhäusser, A.FZJ* ; Xie, X.FZJ*

2019
MDPI Basel

This record in other databases:    

Please use a persistent id in citations: http://hdl.handle.net/2128/22709  doi:10.3390/s19163566

Abstract: 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

---

Contributing Institute(s):

1. Bioelektronik (ICS-8)

Research Program(s):

1. 523 - Controlling Configuration-Based Phenomena (POF3-523) (POF3-523)

Appears in the scientific report 2019

---

Database coverage:
; ; ; ; Clarivate Analytics Master Journal List ; DOAJ Seal ; Ebsco Academic Search ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; PubMed Central ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

---