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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 7 — Mar. 1, 1999
  • pp: 1110–1114

Railroad bridge instrumentation with fiber-optic sensors

Wanku Lee, Jongseo Lee, Craig Henderson, Henry F. Taylor, Ray James, Chung E. Lee, Victor Swenson, Robert A. Atkins, and William G. Gemeiner  »View Author Affiliations


Applied Optics, Vol. 38, Issue 7, pp. 1110-1114 (1999)
http://dx.doi.org/10.1364/AO.38.001110


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Abstract

Fiber-optic sensors were installed on fatigue-critical components in the superstructure of a railroad bridge to monitor dynamic strains induced by trains crossing the bridge as well as to detect the onset of cracks. Each fiber Fabry–Perot interferometer (FFPI) strain gage was adhesively bonded to a stainless-steel strip to facilitate all-weather installation on the steel bridge members by spot welding. FFPI strain sensors were also installed on a rail at an approach to the bridge. Electrical resistive strain gages were colocated with the fiber-optic sensors on the bridge for the purpose of performance verification. In addition to the strain gages, fiber-optic continuity sensors for crack detection were bonded to the structure at critical locations. A telemetry system for transmitting the data over telephone lines was also installed at the bridge site. Dynamic response of the fiber-optic strain sensors is comparable with that of the electrical gages, and their performance has not degraded in the year since the initial installation.

© 1999 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot

History
Original Manuscript: August 31, 1998
Revised Manuscript: November 9, 1998
Published: March 1, 1999

Citation
Wanku Lee, Jongseo Lee, Craig Henderson, Henry F. Taylor, Ray James, Chung E. Lee, Victor Swenson, Robert A. Atkins, and William G. Gemeiner, "Railroad bridge instrumentation with fiber-optic sensors," Appl. Opt. 38, 1110-1114 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-7-1110

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