Table of Contents
Smart Materials Research
Volume 2013, Article ID 496492, 7 pages
http://dx.doi.org/10.1155/2013/496492
Research Article

UHF-Band Wireless Power Transfer System for Structural Health Monitoring Sensor Network

1Graduate School of Information, Production and Systems, Waseda University, Kitakyushu 808-0135, Japan
2Hibikino Department, Yoshikawa Kogyo Co., Ltd., Kitakyushu 808-0138, Japan

Received 6 April 2013; Revised 16 September 2013; Accepted 1 October 2013

Academic Editor: Chris Bowen

Copyright © 2013 Tansheng Li et al. 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.

Abstract

For detecting and measuring health conditions of bridges, wireless sensor networks are used in these days. However, battery life is critically restricting the application and maintenance cost of sensor network systems. To extend life time, a wireless power transfer system at UHF band is introduced to supply the current wireless sensor network. This power transfer system is based on electric wave at 950 MHz. This power transfer system is redesigned for tiny power transmission, including a combination of a rectenna and a Cockcroft-Walton boost converter, battery board, and a control board. Also, current wireless sensor network is redesigned for power transfer system. The working flow of sensor network is modified to bottom-to-top to save power of sensor modules which are the power bottleneck of this sensor system. As a result, the system is able to support a sensor module continuously with received power of −14 dBmW, when the transmitting antenna is 30 dBmW at 10 meters distance.