Pilot Study on Rugged Fiber Optic Brillouin Sensors for Large-Strain Measurements to Ensure the Safety of Transportation Structures

Brillouin-scattering Optical Time Domain Reflectometry (BOTDR) is a viable technology for simultaneous, distributed strain and temperature measurements for miles-long transportation structures. It is a promising tool to ensure the smooth operation and safety of bridge structures that are key links in surface transportation networks or between various transportation modes, for example, from airport to train station. Currently, telecom-grade optical fibers are widely used in civil engineering for strain and temperature measurements. These fibers are very fragile and easy to break during installation and measurement. In order to understand the ultimate behavior of structures, more rugged optical fibers such as carbon/polyimide coated fibers were recently proposed. One laboratory study on two single fibers indicated that new carbon/polyimide coated fibers can sustain a maximum strain of up to 4%, which can survive any local crack in concrete members or buckling in steel members once they are installed on the structural members. This project aimed to characterize the ruggedness and signal loss of various packaged optical fibers and validate their performance as sensors. Among the tested optical fibers, bare single-mode fibers (SMF-28) with uncoated anchoring have the lowest shear strength and the lowest ultimate strain under tension, and are thus not suitable to apply in harsh environments. Polyimide-coated optical fibers have the highest shear strength and the highest ultimate strain under tension, making them the best candidate for civil infrastructure applications. Both glass fiber reinforcing polymer (GFRP) and carbon coated optical fibers are sufficiently rugged to be applied to civil infrastructure.

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• Summary URL:
  http://matc.unl.edu/research/research_projects.php?researchID=17
• Record URL:
  https://rosap.ntl.bts.gov/view/dot/25424
• Supplemental Notes:
  • This document is disseminated under the sponsorship of the U.S. Department of Transportation, University Transportation Centers Program.
• Corporate Authors:

  Mid-America Transportation Center

  University of Nebraska-Lincoln
  2200 Vine Street, PO Box 830851
  Lincoln, NE  United States  68583-0851

  Missouri University of Science and Technology, Rolla

  Center for Infrastructure Engineering Studies
  Rolla, MO  United States  65409

  Research and Innovative Technology Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Chen, Genda
  • Zhou, Zhi
  • Xiao, Hai
  • Huang, Ying
• Publication Date: 2012-7

Language

• English

Media Info

• Media Type: Digital/other
• Edition: Final Report
• Features: Figures; Photos; References; Tables;
• Pagination: 81p

Subject/Index Terms

• TRT Terms: Bridges; Carbon fibers; Fiber optics; Glass fiber reinforced plastics; Optical fibers; Polymer fibers; Sensors; Shear strength; Strain measurement
• Uncontrolled Terms: Ruggedness
• Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation; I61: Equipment and Maintenance Methods;

Filing Info

• Accession Number: 01470009
• Record Type: Publication
• Report/Paper Numbers: 25-1121-0001-114, 25-1121-0001-242, MATC-MST: 114
• Files: UTC, NTL, TRIS, ATRI, USDOT
• Created Date: Jan 17 2013 1:56PM