Temperature dependence of magnetic resonance sensors for embedding into constructed wetlands

Hughes-Riley, T. ORCID: 0000-0001-8020-430X, Newton, M.I. ORCID: 0000-0003-4231-1002 and Morris, R.H. ORCID: 0000-0001-5511-3457, 2014. Temperature dependence of magnetic resonance sensors for embedding into constructed wetlands. In: 1st International Electronic Conference on Sensors and Applications (ECSA), 1-16 June 2014. Sciforum electronic conference series, 1 . Basel, Switzerland: MDPI, c006.

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Abstract

Constructed wetlands are an environmentally considerate means of water purification. Automating parameters such as heating and aeration may extend the lifetime of constructed wetlands and allow for superior waste-water treatment. One critical parameter to monitor in a wetland system is clogging of pores within the gravel matrix, as this limits the viable lifetime of the system. It has previously been observed in a laboratory setting that magnetic resonance (MR) relaxation measurements, T1 and T2eff, can be used to characterise the clogging state. Various open-geometry MR sensors have been constructed using permanent neodymium magnets with the view of long-term embedding as part of the EU FP7 project ARBI (Automated Reed Bed Installations). The ultimate aim is to monitor clogging levels over the lifetime of the reed bed using MR techniques. One issue with taking various MR measurements over such an extreme time scale, in this case years, is that temperature fluctuations will significantly alter the magnetic field strength produced by the sensors constituent magnets. While the RF transmit-receive circuit has been built so that MR can still be conducted at a range of frequencies without altering the tuning or matching of the circuit, this will result in poor RF excitation if the magnetic field strength shifts significantly. This work investigates the effect that temperature has on the a MR sensor intended for embedding, to determine whether received signal intensity is compromised significantly at large temperature changes.

Item Type: Chapter in book
Creators: Hughes-Riley, T., Newton, M.I. and Morris, R.H.
Publisher: MDPI
Place of Publication: Basel, Switzerland
Date: 2014
Volume: 1
Identifiers:
NumberType
10.3390/ecsa-1-c006DOI
Rights: © 2014 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license.
Divisions: Schools > School of Science and Technology
Depositing User: Jonathan Gallacher
Date Added: 05 Jan 2018 09:14
Last Modified: 05 Jan 2018 09:14
URI: http://irep.ntu.ac.uk/id/eprint/32309

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