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Fiber Bragg Grating Sensors for Structural and Railway Applications

Tam, Hwa-Yaw, Liu, Shun-Yee, Guan, Bai-Ou, Chung, Weng-Hong, Chan, Tommy H.T., & Cheng, L.K. (2004) Fiber Bragg Grating Sensors for Structural and Railway Applications. In Engineering Structures, International Society for Optical Engineering (SPIE), Beijing, PR China, pp. 85-97.

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Abstract

Historically, due to the high cost of optical devices, fiber-optics sensor systems were only employed in niche areas where conventional electrical sensors are not suitable. This scenario changed dramatically in the last few years following the explosion of the Internet which caused the rapid expansion of the optical fiber telecommunication industry and substantially driven down the cost of optical components. In recent years, fiber-optic sensors and particularly fiber Bragg grating (FBG) sensors have attracted a lot of interests and are being used in numerous applications. We have conducted several field trials of FBG sensors for railway applications and structural monitoring. About 30 FBG sensors were installed on the rail tracks of Kowloon¬Canton Railway Corp. for train identification and speed measurements and the results obtained show that FBG sensors exhibit very good performance and could play a major role in the realization of "Smart Railway". FBG sensors were also installed on Hong Kong's landmark TsingMa Bridge, which is the world longest suspension bridge (2.2 km) that carries both trains and regular road traffic. The trials were carried out with a high-speed (up to 20 kHz) interrogation system based on CCD and also with a interrogation unit that based on scanning optical filter (up to 70 Hz). Forty FBGs sensors were divided into 3 arrays and installed on different parts of the bridge (suspension cable, rocker bearing and truss girders). The objectives of the field trial on the TsingMa Bridge are to monitor the strain of different parts of the bridge under railway load and highway load, and to compare the FBG sensors' performance with conventional resistive strain gauges already installed on the bridge. The measured results show that excellent agreement was obtained between the 2 types of sensors.

Impact and interest:

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1 citations in Web of Science®

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ID Code: 12779
Item Type: Conference Paper
Keywords: structural health monitoring, fiber Bragg grating (FBG), Tsing Ma bridge (TMB), strain, OPTICAL, FIBER, SIMULTANEOUS STRAIN, CAVITY SENSOR, TEMPERATURE, SYSTEM, railway
DOI: 10.1117/12.580803
Subjects: Australian and New Zealand Standard Research Classification > TECHNOLOGY (100000)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Urban Development
Copyright Owner: Copyright 2004 International Society for Optical Engineering (SPIE)
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 04 Mar 2008
Last Modified: 29 Feb 2012 23:53

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