A resistive Q-switch for low-field NMR systems

J Z Zhen; K T O'Neill; E O Fridjonsson; P L Stanwix; M L Johns

doi:10.1016/j.jmr.2017.12.006

A resistive Q-switch for low-field NMR systems

J Magn Reson. 2018 Feb:287:33-40. doi: 10.1016/j.jmr.2017.12.006. Epub 2017 Dec 8.

Authors

J Z Zhen¹, K T O'Neill¹, E O Fridjonsson¹, P L Stanwix¹, M L Johns²

Affiliations

¹ School of Mechanical and Chemical Engineering, University of Western Australia, Crawley, WA 6009, Australia.
² School of Mechanical and Chemical Engineering, University of Western Australia, Crawley, WA 6009, Australia. Electronic address: michael.johns@uwa.edu.au.

PMID: 29278827
DOI: 10.1016/j.jmr.2017.12.006

Abstract

An NMR Q-switch was designed and constructed specifically for use with low-field NMR apparatus. This featured a comparatively simple resistive damping design. It served to reduce the r.f. probe ring-down time, and hence reduced the signal acquisition delay from 25 ms to 9 ms, on an Earth's magnetic field NMR system. The advantage of this earlier acquisition was demonstrated for both an aqueous suspension of iron oxide particles and using an NMR flow meter.

Keywords: Damping; Earth's field NMR; Flow meter; Low-field NMR; Q-switch; Ring-down.

Publication types

Research Support, Non-U.S. Gov't