Strain-temperature monitor of high speed railway switch by fiber Bragg grating gauges

Weilai Li; Xiaomei Huang; Jian Cheng; Jianjun Pan

doi:10.1117/12.865497

12 October 2010 Strain-temperature monitor of high speed railway switch by fiber Bragg grating gauges

Weilai Li, Xiaomei Huang, Jian Cheng, Jianjun Pan

Proceedings Volume 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 76565E (2010) https://doi.org/10.1117/12.865497
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

On the 350km/h high speed railway there is a seamless track switch on a bridge. 32 Fiber Bragg Grating (FGB) gauges are used along the neutral line of the tracks to monitor the strain generated by thermal, geological and vibrational factors, and these FBG strain gauges have the function of strain expansion. Meanwhile other 6 FBG sensors are used to measure the temperature for strain compensating purpose. The Finite Element Analysis method is used to analyze the special shape of the gauges. A testing unit was used to test the FBG gauges and bare FBG on the track samples under measurable pressure and tension. The fixing and encapsulating technology of FBG gauges on the surface of the track and to protect the fiber cable to survive in the harsh conditions are discussed. The strain status of switch tracks could be obtained by processing the data from FBG strain gauges and FBG temperature sensors. The results of measurement showed that in 9 days, the strain in the track shifted 350 με, and the strain curves closely correlated with the temperature curves.

Citation Download Citation

Weilai Li, Xiaomei Huang, Jian Cheng, and Jianjun Pan "Strain-temperature monitor of high speed railway switch by fiber Bragg grating gauges", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76565E (12 October 2010); https://doi.org/10.1117/12.865497

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