Smart Structures and Systems

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Development of a low-cost multifunctional wireless impedance sensor node

  • Min, Jiyoung (Department of Civil and Environmental Engineering, KAIST) ;
  • Park, Seunghee (Department of Civil and Environmental Engineering, Sungkyunkwan University) ;
  • Yun, Chung-Bang (Department of Civil and Environmental Engineering, KAIST) ;
  • Song, Byunghun (RFID-USN Convergence Research Center, Korea Electronics Technology Institute)
  • Received : 2009.11.12
  • Accepted : 2010.02.20
  • Published : 2010.07.25
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Abstract

In this paper, a low cost, low power but multifunctional wireless sensor node is presented for the impedance-based SHM using piezoelectric sensors. Firstly, a miniaturized impedance measuring chip device is utilized for low cost and low power structural excitation/sensing. Then, structural damage detection/sensor self-diagnosis algorithms are embedded on the on-board microcontroller. This sensor node uses the power harvested from the solar energy to measure and analyze the impedance data. Simultaneously it monitors temperature on the structure near the piezoelectric sensor and battery power consumption. The wireless sensor node is based on the TinyOS platform for operation, and users can take MATLAB$^{(R)}$ interface for the control of the sensor node through serial communication. In order to validate the performance of this multifunctional wireless impedance sensor node, a series of experimental studies have been carried out for detecting loose bolts and crack damages on lab-scale steel structural members as well as on real steel bridge and building structures. It has been found that the proposed sensor nodes can be effectively used for local wireless health monitoring of structural components and for constructing a low-cost and multifunctional SHM system as "place and forget" wireless sensors.

Keywords

References

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