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Sensors 2016, 16(12), 2049; doi:10.3390/s16122049

A Touch Sensing Technique Using the Effects of Extremely Low Frequency Fields on the Human Body

1
Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
2
Electrical Engineering Department, Faculty of Engineering, The British University in Egypt, Cairo 11837, Egypt
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 17 August 2016 / Revised: 31 October 2016 / Accepted: 21 November 2016 / Published: 2 December 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [2255 KB, uploaded 2 December 2016]   |  

Abstract

Touch sensing is a fundamental approach in human-to-machine interfaces, and is currently under widespread use. Many current applications use active touch sensing technologies. Passive touch sensing technologies are, however, more adequate to implement low power or energy harvesting touch sensing interfaces. This paper presents a passive touch sensing technique based on the fact that the human body is affected by the surrounding extremely low frequency (ELF) electromagnetic fields, such as those of AC power lines. These external ELF fields induce electric potentials on the human body—because human tissues exhibit some conductivity at these frequencies—resulting in what is called AC hum. We therefore propose a passive touch sensing system that detects this hum noise when a human touch occurs, thus distinguishing between touch and non-touch events. The effectiveness of the proposed technique is validated by designing and implementing a flexible touch sensing keyboard. View Full-Text
Keywords: human touch sensing; ELF electromagnetic fields; flexible touch sensing surfaces human touch sensing; ELF electromagnetic fields; flexible touch sensing surfaces
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Elfekey, H.; Bastawrous, H.A.; Okamoto, S. A Touch Sensing Technique Using the Effects of Extremely Low Frequency Fields on the Human Body. Sensors 2016, 16, 2049.

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