title: A Self-Powered Insole for Human Motion Recognition.
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.
authors.affiliation: Collaborative Innovation Center for Micro/Nano Fabrication, Device and System, Tsinghua University, Beijing 100084, China. hanyz15@mails.tsinghua.edu.cn.|State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China. hanyz15@mails.tsinghua.edu.cn.|Department of Precision Instrument, Tsinghua University, Beijing 100084, China. hanyz15@mails.tsinghua.edu.cn.
authors.forename: Yingzhou
authors.initials: Y
authors.lastname: Han
authors.affiliation: Collaborative Innovation Center for Micro/Nano Fabrication, Device and System, Tsinghua University, Beijing 100084, China. caoyl15@mails.tsinghua.edu.cn.|State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China. caoyl15@mails.tsinghua.edu.cn.|Department of Precision Instrument, Tsinghua University, Beijing 100084, China. caoyl15@mails.tsinghua.edu.cn.
authors.forename: Yalu
authors.initials: Y
authors.lastname: Cao
authors.affiliation: Collaborative Innovation Center for Micro/Nano Fabrication, Device and System, Tsinghua University, Beijing 100084, China. jing.jing.youxiang@163.com.|State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China. jing.jing.youxiang@163.com.|Department of Precision Instrument, Tsinghua University, Beijing 100084, China. jing.jing.youxiang@163.com.
authors.forename: Jingjing
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Collaborative Innovation Center for Micro/Nano Fabrication, Device and System, Tsinghua University, Beijing 100084, China. yin-yj14@mails.tsinghua.edu.cn.|State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China. yin-yj14@mails.tsinghua.edu.cn.|Department of Precision Instrument, Tsinghua University, Beijing 100084, China. yin-yj14@mails.tsinghua.edu.cn.
authors.forename: Yajiang
authors.initials: Y
authors.lastname: Yin
authors.affiliation: Collaborative Innovation Center for Micro/Nano Fabrication, Device and System, Tsinghua University, Beijing 100084, China. ylc12@mails.tsinghua.edu.cn.|State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China. ylc12@mails.tsinghua.edu.cn.|Department of Precision Instrument, Tsinghua University, Beijing 100084, China. ylc12@mails.tsinghua.edu.cn.
authors.forename: Liangchen
authors.initials: L
authors.lastname: Ye
authors.affiliation: Collaborative Innovation Center for Micro/Nano Fabrication, Device and System, Tsinghua University, Beijing 100084, China. xfw@mail.tsinghua.edu.cn.|State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China. xfw@mail.tsinghua.edu.cn.|Department of Precision Instrument, Tsinghua University, Beijing 100084, China. xfw@mail.tsinghua.edu.cn.
authors.forename: Xiaofeng
authors.initials: X
authors.lastname: Wang
authors.affiliation: Collaborative Innovation Center for Micro/Nano Fabrication, Device and System, Tsinghua University, Beijing 100084, China. yz-dpi@mail.tsinghua.edu.cn.|State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University, Beijing 100084, China. yz-dpi@mail.tsinghua.edu.cn.|Department of Precision Instrument, Tsinghua University, Beijing 100084, China. yz-dpi@mail.tsinghua.edu.cn.
authors.forename: Zheng
authors.initials: Z
authors.lastname: You
mesh_terms: D000465:Algorithms; D011211:Electric Power Supplies; D004560:Electricity; D004581:Electronics; D006801:Humans; D009038:Motion; D012775:Shoes; D058067:Wavelet Analysis
keywords: energy harvester; motion recognition; self-powered insole; wearable sensors