Enhancement of the Nuclear Spin Noise Signal Using Wavelet Transform

Adilakshmi, D and Chandra, Kousik and Ramanathan, KV (2019) Enhancement of the Nuclear Spin Noise Signal Using Wavelet Transform. In: CHEMPHYSCHEM, 20 (3). pp. 456-462.

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Abstract

Spin noise spectroscopy has attracted considerable attention recently owing partly to intrinsic interest in the phenomenon and partly to its significant application potential. Here, we address the inherent problem of low sensitivity of nuclear spin noise and examine the utility of wavelet transform to mitigate this problem by distinguishing real peaks from the noise contaminated data. Suppression of the random circuit noise and the consequent enhancement of the correlated nuclear spin noise signal have been demonstrated with discrete wavelet transform. Spectra of both H-1 and C-13 nuclear spins have been considered and significant signal enhancements in both the cases have been observed. A detailed analysis of several possible wavelet, thresholding and decomposition solutions have been made to obtain the optimum condition for signal enhancement. It is observed that the application of wavelet transform leaves the spin noise signal line shape essentially unchanged, which is an advantage for several applications involving spin noise spectra.

Item Type:	Journal Article
Publication:	CHEMPHYSCHEM
Publisher:	WILEY-V C H VERLAG GMBH
Additional Information:	Copyright of this article belongs to WILEY-V C H VERLAG GMBH
Keywords:	carbon-13; nuclear spin noise; signal enhancement; spectroscopy; wavelet transform
Department/Centre:	Division of Chemical Sciences > NMR Research Centre (Formerly Sophisticated Instruments Facility) Division of Physical & Mathematical Sciences > Physics
Date Deposited:	19 Feb 2019 05:33
Last Modified:	19 Feb 2019 05:33
URI:	http://eprints.iisc.ac.in/id/eprint/61751

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