Cost effective power amplifiers for pulsed NMR sensors

Newton, MI ORCID: https://orcid.org/0000-0003-4231-1002, Hughes-Riley, T ORCID: https://orcid.org/0000-0001-8020-430X and Morris, RH ORCID: https://orcid.org/0000-0001-5511-3457, 2015. Cost effective power amplifiers for pulsed NMR sensors. In: 2nd International Electronic Conference on Sensors and Applications (ESCA), [online] Basel, Switzerland, 15-30 November 2015.

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Abstract

Sensors that measure magnetic resonance relaxation times are increasingly finding applications in areas such as food and drink authenticity and waste water treatment control. Modern permanent magnets are used to provide the static magnetic field in many commercial instruments and advances in electronics, such as field programmable gate arrays, have provided lower cost console electronics for generating and detecting the pulse sequence. One area that still remains prohibitively expensive for many sensor applications of pulsed NMR is the requirement for a high frequency power amplifier. With many permanent magnet sensors providing a magnetic field in the 0.25T to 0.5T range, a power amplifier that operates in the 10MHz to 20MHz rage is required. In this work we demonstrate that some low cost commercial amplifiers can be used, with minor modification, to operate as pulsed NMR power amplifiers. We demonstrate two amplifier systems, one medium power that can be constructed for less than Euro 100 and a second much high power system that produces comparable results to commercial pulse amplifiers that are an order of magnitude more expensive. Data is presented using both the commercial NMR MOUSE and a permanent magnet system used for monitoring the clog state of constructed wetlands.

Item Type:	Conference contribution
Description:	Proceedings of the 2nd International Electronic Conference on Sensors and Applications (ESCA). Sciforum electronic conference series, Vol. 2, 2015, Paper C005
Creators:	Newton, M.I., Hughes-Riley, T. and Morris, R.H.
Date:	2015
Identifiers:	Number Type 10.3390/ecsa-2-C005 DOI
Divisions:	Schools > School of Science and Technology
Record created by:	Linda Sullivan
Date Added:	27 Nov 2015 09:52
Last Modified:	09 Jun 2017 13:57
URI:	https://irep.ntu.ac.uk/id/eprint/26526

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