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Smart Structures and Systems Volume 6, Number 5, July-August 2010 , pages 661-673 DOI: https://doi.org/10.12989/sss.2010.6.5_6.661 |
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Multi-scale wireless sensor node for health monitoring of civil infrastructure and mechanical systems |
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Stuart G. Taylor, Kevin M. Farinholt, Gyuhae Park, Michael D. Todd and Charles R. Farrar
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| Abstract | ||
| This paper presents recent developments in an extremely compact, wireless impedance sensor node (the WID3, Wireless Impedance Device) for use in high-frequency impedance-based structural health monitoring (SHM), sensor diagnostics and validation, and low-frequency (< ~1 kHz) vibration data acquisition. The WID3 is equipped with an impedance chip that can resolve measurements up to 100 kHz, a frequency range ideal for many SHM applications. An integrated set of multiplexers allows the end user to monitor seven piezoelectric sensors from a single sensor node. The WID3 combines on-board processing using a microcontroller, data storage using flash memory, wireless communications capabilities, and a series of internal and external triggering options into a single package to realize a truly comprehensive, self-contained wireless active-sensor node for SHM applications. Furthermore, we recently extended the capability of this device by implementing low-frequency analog-to-digital and digital-to-analog converters so that the same device can measure structural vibration data. The compact sensor node collects relatively low-frequency acceleration measurements to estimate natural frequencies and operational deflection shapes, as well as relatively high-frequency impedance measurements to detect structural damage. Experimental results with application to SHM, sensor diagnostics and low-frequency vibration data acquisition are presented. | ||
| Key Words | ||
| structural health monitoring; impedance method; piezoelectric active-sensors; sensor diagnostics; wireless hardware. | ||
| Address | ||
| Stuart G. Taylor, Kevin M. Farinholt and Gyuhae Park; The Engineering Institute, Los Alamos National Laboratory, NM 87545, USA Michael D. Todd; Department of Structural Engineering, University of California, San Diego, CA 92093, USA Charles R. Farrar; The Engineering Institute, Los Alamos National Laboratory, NM 87545, USA | ||