Spintronic sensors based on magnetic tunnel junctions for wireless eye movement gesture control

Tanwear, A., Liang, X., Liu, Y., Vuckovic, A., Ghannam, R. , Böhnert, T., Paz, E., Freitas, P. P., Ferreira, R. and Heidari, H. (2020) Spintronic sensors based on magnetic tunnel junctions for wireless eye movement gesture control. IEEE Transactions on Biomedical Circuits and Systems, 14(6), pp. 1299-1310. (doi: 10.1109/TBCAS.2020.3027242)

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Abstract

The tracking of eye gesture movements using wearable technologies can undoubtedly improve quality of life for people with mobility and physical impairments by using spintronic sensors based on the tunnel magnetoresistance (TMR) effect in a human-machine interface. Our design involves integrating three TMR sensors on an eyeglass frame for detecting relative movement between the sensor and tiny magnets embedded in an in-house fabricated contact lens. Using TMR sensors with the sensitivity of 11mV/V/Oe and ten <1 mm3 embedded magnets within a lens, an eye gesture system was implemented with a sampling frequency of up to 28 Hz. Three discrete eye movements were successfully classified when a participant looked up, right or left using a threshold-based classifier. Moreover, our proof-of-concept real-time interaction system was tested on 13 participants, who played a simplified Tetris game using their eye movements. Our results show that all participants were successful in completing the game with an average accuracy of 90.8%.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ghannam, Dr Rami and Heidari, Dr Hadi and Liang, Xiangpeng and Tanwear, Mr Asfand and Liu, Miss Yuchi and Vuckovic, Dr Aleksandra
Authors: Tanwear, A., Liang, X., Liu, Y., Vuckovic, A., Ghannam, R., Böhnert, T., Paz, E., Freitas, P. P., Ferreira, R., and Heidari, H.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IEEE Transactions on Biomedical Circuits and Systems
Publisher:IEEE
ISSN:1932-4545
ISSN (Online):1940-9990
Published Online:29 September 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in IEEE Transactions on Biomedical Circuits and Systems 14(6): 1299-1310
Publisher Policy:Reproduced under a Creative Commons licence

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
304896EPSRC-IAA: Early Stage Commercialisation of a PET Imaging Agent for the Detection of Cardiovascular Disease and CancerAndrew SutherlandEngineering and Physical Sciences Research Council (EPSRC)EP/R511705/1Chemistry