Generation of acoustic-Brownian noise in nuclear magnetic resonance under non-equilibrium thermal fluctuations
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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.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Springer Science and Business Media LLC
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)
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