A fiber-optic distributed sensor system suitable for the monitoring of the longitudinal strain of a rail has been proposed and experimentally tested. The sensor system was based on the stimulated Brillouin scattering in an optical fiber processed by the correlation domain analysis for the distributed measurement. The vertical load was applied on a KS60 rail aid on five PC sleepers, spaced every 520 mm. A longitudinal strain distribution profile of a 2.8 m rail was acquired when the vertical load added on the rail. The spatial resolution of the strain measurement was 3.6 cm with 94 measurement points along the rail and the measurement accuracy was +/-15 micro epsilon. We think the Brillouin distributed sensor system can provide a powerful tool for several applications such as the modification of the stroke at the expansion joint, thickness determination of the roadbed, and proper selection of the track element.
Longitudinal strain monitoring of rail using a distributed fiber sensor based on Brillouin optical correlation domain analysis
Überwachung der Longitudinaldehnung von Schienen mittels verteilter Fasersensoren basierend auf optische Brillouin-Korrelation Domainanalyse
NDT&E International ; 44 , 7 ; 637-644
2011
8 Seiten, 10 Bilder, 3 Tabellen, 21 Quellen
Aufsatz (Zeitschrift)
Englisch
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