Operational amplifiers revisited for low field magnetic resonance relaxation time measurement electronics

Morris, R ORCID: https://orcid.org/0000-0001-5511-3457, Newton, M ORCID: https://orcid.org/0000-0003-4231-1002 and Almazrouei, N, 2019. Operational amplifiers revisited for low field magnetic resonance relaxation time measurement electronics. Proceedings, 42 (1): 1. ISSN 2504-3900

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Abstract

Advances in permanent magnet technology has seen more reports of sensor applications of low field magnetic resonance. Whilst most are either in the 10–20 MHz range or in the earth’s field, measurements at below 1 MHz are beginning to become more widespread. This range is below the need for careful radio frequency electronics design but above the audio domain and represents an interesting cross over. Many commercial spectrometers do not include the pulse power amplifier, duplexer and preamplifier as these depend on the frequency range used. In this work we demonstrate that, with the current specifications of the humble operational amplifier, the most simple form of an inverting design using only two resistors and decoupling, can effectively provide this ‘front end’ electronics. The low powers used mean crossed Ge diodes provide an excellent duplexer and it is suitable for battery powered applications.

Item Type:	Journal article
Description:	Presented at the 6th International Electronic Conference on Sensors and Applications, 15–30 November 2019.
Publication Title:	Proceedings
Creators:	Morris, R., Newton, M. and Almazrouei, N.
Publisher:	MDPI
Date:	14 November 2019
Volume:	42
Number:	1
ISSN:	2504-3900
Identifiers:	Number Type 10.3390/ecsa-6-06645 DOI 1272262 Other
Divisions:	Schools > School of Science and Technology
Record created by:	Jonathan Gallacher
Date Added:	20 Jan 2020 15:58
Last Modified:	20 Jan 2020 15:58
URI:	https://irep.ntu.ac.uk/id/eprint/39016

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