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Sensors 2016, 16(9), 1502; doi:10.3390/s16091502

A Self-Powered Insole for Human Motion Recognition

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Collaborative Innovation Center for Micro/Nano Fabrication, Device and System, Tsinghua University, Beijing 100084, China
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State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China
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Department of Precision Instrument, Tsinghua University, Beijing 100084, China
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Authors to whom correspondence should be addressed.
Academic Editors: Steffen Leonhardt and Daniel Teichmann
Received: 11 July 2016 / Revised: 20 August 2016 / Accepted: 9 September 2016 / Published: 15 September 2016
(This article belongs to the Special Issue Wearable Biomedical Sensors)
View Full-Text   |   Download PDF [3998 KB, uploaded 15 September 2016]   |  

Abstract

Biomechanical energy harvesting is a feasible solution for powering wearable sensors by directly driving electronics or acting as wearable self-powered sensors. A wearable insole that not only can harvest energy from foot pressure during walking but also can serve as a self-powered human motion recognition sensor is reported. The insole is designed as a sandwich structure consisting of two wavy silica gel film separated by a flexible piezoelectric foil stave, which has higher performance compared with conventional piezoelectric harvesters with cantilever structure. The energy harvesting insole is capable of driving some common electronics by scavenging energy from human walking. Moreover, it can be used to recognize human motion as the waveforms it generates change when people are in different locomotion modes. It is demonstrated that different types of human motion such as walking and running are clearly classified by the insole without any external power source. This work not only expands the applications of piezoelectric energy harvesters for wearable power supplies and self-powered sensors, but also provides possible approaches for wearable self-powered human motion monitoring that is of great importance in many fields such as rehabilitation and sports science. View Full-Text
Keywords: wearable sensors; motion recognition; self-powered insole; energy harvester wearable sensors; motion recognition; self-powered insole; energy harvester
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Han, Y.; Cao, Y.; Zhao, J.; Yin, Y.; Ye, L.; Wang, X.; You, Z. A Self-Powered Insole for Human Motion Recognition. Sensors 2016, 16, 1502.

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