Optical detection of low frequency NQR signals: a step forward from conventional NQR

In searching for the more sensitive 14N nuclear quadrupole resonance (NQR) detecting system for illicit substances, a promising combination of a classic RF pulse NQR spectrometer and a K optically pumped magnetometer was tested. The initial results are encouraging. The principles of such a combinati...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2017-03, Vol.50 (9), p.95601
Main Authors: Begus, S, Pirnat, J, Jazbinsek, V, Trontelj, Z
Format: Article
Language:English
Subjects:
illicit materials
improved NQR
low frequency RF signals
optically pumped magnetometer
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Summary:In searching for the more sensitive 14N nuclear quadrupole resonance (NQR) detecting system for illicit substances, a promising combination of a classic RF pulse NQR spectrometer and a K optically pumped magnetometer was tested. The initial results are encouraging. The principles of such a combination are described, and the detection limits in the low frequency RF region, where the 14N pulse NQR frequencies are usually positioned, are presented. Several illicit substances which are difficult to detect with a classic pulse NQR spectrometer were detected with both types of spectrometers. We noticed that with the proposed combination of classic RF excitation of 14N nuclei, using a pulse NQR spectrometer and subsequent optical detection of the sample's response, a gain in S/N of up to a factor of 10 was possible.
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/aa4f23