Generation of acoustic-Brownian noise in nuclear magnetic resonance under non-equilibrium thermal fluctuations
Author(s)
Sinha, Dhiraj
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We present an analytical study on generation of acoustic-Brownian noise in nuclear magnetic resonance (NMR) induced as a result of thermal fluctuations of the magnetic moments under non-equilibrium thermal interactions which has not been explored independent of Nyquist–Johnson noise until now. The mechanism of physical coupling between non-equilibrium thermal fluctuations and magnetic moments is illustrated using Lighthill’s formulation on suspension dynamics. We discover that unlike Nyquist–Johnson noise which has a uniform spectral density across a range of frequencies, the spectral dependence of acoustic-Brownian noise decreases with an increase in frequency and resembles Brownian noise associated with a particle in a potential well. The results have applications in the field of image enhancement algorithm as well as noise reduction instrumentation in NMR systems.
Date issued
2020-12Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer ScienceJournal
Scientific Reports
Publisher
Springer Science and Business Media LLC
Citation
Sinha, Dhiraj. "Generation of acoustic-Brownian noise in nuclear magnetic resonance under non-equilibrium thermal fluctuations." Scientific Reports 10, 1 (December 2020): 21406 © 2020 The Author(s)
Version: Final published version
ISSN
2045-2322