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Weilai LI1( 
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Abstract
The fiber Bragg grating (FBG) sensing technology was used to monitor the situation of a crevice of the continuous beam joint and rails near rail expansion devices on a viaduct of the urban railway. The monitoring items consisted of the rail temperature, rail displacement, viaduct beam displacement, and strain of sliding rail in the rail expansion device section. The strain sensor was a prefabricate FBG strain gauge, the displacement sensor with different scales used an FBG stress ring, and the FBG of the temperature sensor was pre-drawn and fixed in a metal tube. Compensation sensors were used to balance environmental temperature changes. All FBGs were suspended adhered, therefore the chirped phenomenon of the FBG reflection peak was avoided, and the measurement accuracy was improved. The monitoring results matched to the manual test and theoretical estimation.
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Photonic Sensors
Volume 4 Issue 2,June 2014
Pages 173-179
Cite this article:
LI W, PANG J, LU X, et al. Rail Expansion Devices Monitored by FBG Sensors on an Urban Railway Viaduct. Photonic Sensors, 2014, 4(2): 173-179. https://doi.org/10.1007/s13320-014-0163-6
Received: 29 December 2013
Revised: 08 March 2014
Published: 09 April 2014
© The Author(s) 2014.
This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
