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Proceedings Paper

Wireless ZigBee strain gage sensor system for structural health monitoring
Author(s): Hiroshi Ide; Frank Abdi; Rashid Miraj; Chau Dang; Tatsuya Takahashi; Bruce Sauer
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Paper Abstract

A compact cell phone size radio frequency (ZigBee) wireless strain measurement sensor system to measure the structural strain deformation was developed. The developed system provides an accurate strain measurement data stream to the Internet for further Diagnostic and Prognostic (DPS) correlation. Existing methods of structural measurement by strain sensors (gauges) do not completely satisfy problems posed by continuous structural health monitoring. The need for efficient health monitoring methods with real-time requirements to bidirectional data flow from sensors and to a commanding device is becoming critical for keeping our daily life safety. The use of full-field strain measurement techniques could reduce costly experimental programs through better understanding of material behavior. Wireless sensor-network technology is a monitoring method that is estimated to grow rapidly providing potential for cost savings over traditional wired sensors. The many of currently available wireless monitoring methods have: the proactive and constant data rate character of the data streams rather than traditional reactive, event-driven data delivery; mostly static node placement on structures with limited number of nodes. Alpha STAR Electronics' wireless sensor network system, ASWN, addresses some of these deficiencies, making the system easier to operate. The ASWN strain measurement system utilizes off-the-shelf sensors, namely strain gauges, with an analog-to-digital converter/amplifier and ZigBee radio chips to keep cost lower. Strain data is captured by the sensor, converted to digital form and delivered to the ZigBee radio chip, which in turn broadcasts the information using wireless protocols to a Personal Data Assistant (PDA) or Laptop/Desktop computers. From here, data is forwarded to remote computers for higher-level analysis and feedback using traditional cellular and satellite communication or the Ethernet infrastructure. This system offers a compact size, lower cost, and temperature insensitivity for critical structural applications, which require immediate monitoring and feedback.

Paper Details

Date Published: 29 April 2009
PDF: 12 pages
Proc. SPIE 7314, Photonics in the Transportation Industry: Auto to Aerospace II, 731403 (29 April 2009); doi: 10.1117/12.819358
Show Author Affiliations
Hiroshi Ide, Alpha STAR Corp. (United States)
Frank Abdi, Alpha STAR Corp. (United States)
Rashid Miraj, Univ. of California, Irvine (United States)
Chau Dang, Alpha STAR Corp. (United States)
Tatsuya Takahashi, Alpha STAR Corp. (United States)
Bruce Sauer, OCM Test Labs., Inc. (United States)

Published in SPIE Proceedings Vol. 7314:
Photonics in the Transportation Industry: Auto to Aerospace II
Alex A. Kazemi; Bernard C. Kress, Editor(s)

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