27 June 2002 Strain monitoring of a newly developed precast concrete track for high speed railway traffic using embedded fiber optic sensors
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Abstract
In a German slab track system (Feste Fahrbahn FF, system Boegl) for speeds up to 300 km/h and more different fiber optic sensors have been embedded in several levels and locations of the track system. The track system consists of prestressed precast panels of steel fiber concrete which are supported by a cat-in-situ concrete or asphalt base course. The sensors are to measure the bond behavior or the stress transfer in the track system. For that, tiny fiber-optic sensors - fiber Fabry-Perot and Bragg grating sensors - have been embedded very near to the interface of the layers. Measurements were taken on a full scale test sample (slab track panel of 6.45 m length) as well as on a real high speed track. The paper describes the measurement task and discusses aspects with regard to sensor design and prefabrication of the sensor frames as well as the embedding procedure into the concrete track. Results from static and dynamic full scale tests carried out in the testing laboratory of BAM and from measurements on a track are given.
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Stephanie Crail, D. Reichel, U. Schreiner, E. Lindner, Wolfgang R. Habel, Detlef Hofmann, Frank Basedau, K. Brandes, A. Barner, Wolfgang Ecke, Kerstin Schroeder, "Strain monitoring of a newly developed precast concrete track for high speed railway traffic using embedded fiber optic sensors", Proc. SPIE 4694, Smart Structures and Materials 2002: Smart Sensor Technology and Measurement Systems, (27 June 2002); doi: 10.1117/12.472627; https://doi.org/10.1117/12.472627
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KEYWORDS
Sensors

Fiber optics sensors

Fiber Bragg gratings

Interferometers

Silver

Cements

Interfaces

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