Photonic Sensors, 2014, 4 (2): 173, 网络出版: 2014-04-09  

Rail Expansion Devices Monitored by FBG Sensors on an Urban Railway Viaduct

Rail Expansion Devices Monitored by FBG Sensors on an Urban Railway Viaduct
作者单位
1 National Engineering Lab of Fiber Optic Sensing Technology, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, China
2 Key Lab of Fiber Optic Sensing Technology and Information Processing, Wuhan University of Technology, 122 Luoshi Road, Wuhan, 430070, China
摘要
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.

Weilai LI, Jin PANG, Xiaoshan LU, Jie LIU. Rail Expansion Devices Monitored by FBG Sensors on an Urban Railway Viaduct[J]. Photonic Sensors, 2014, 4(2): 173. Weilai LI, Jin PANG, Xiaoshan LU, Jie LIU. Rail Expansion Devices Monitored by FBG Sensors on an Urban Railway Viaduct[J]. Photonic Sensors, 2014, 4(2): 173.

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