High-speed railway line: static and dynamic distributed measurements

This project is the world’s first use of a composite sensor called EpsilonFlat, which is the modified version of the circular EpsilonSensor. Thanks to its flat rectangular cross-section with no outer braid, it could be conveniently glued on flat surfaces, e.g. steel rails. Each sensor was equipped with 4 optical fibres to allow simultaneous readings with different data loggers. What is more, top and bottom sections were installed over 1,100 m to enable the curvature and displacement calculations.

DFOS Sensors Installed: EpsilonFlat

Project challenges

How to apply non-invasive diagnostics in demanding historic structures?
How to get precise measurement data to detect local damage and imperfection?
How to measure detailed strain profiles over the entire height of the brick masonry wall?

Benefits of using the DFOS monitoring system

Parallel DSS (strain), DTS (temperature), DDS (displacement) and DAS (acoustic)
Simultanous Rayleigh, Brillouin and Raman measurements
Dynamic load test and long-term readings with cyclic thermal changes
Objective data for structural assessment to allow high-speed trains

Results of using the DFOS monitoring system

The project in question is the first of its kind in Poland and probably also in the world. More than 2,200 m of sensing path is read simultaneously using different data loggers (Rayleigh, Brillouin and Raman) to obtain comprehensive data on strains, temperatures, curvatures, displacements and vibrations. The system will provide knowledge about the long-term performance of the railway line (including thermal compensation) and also during dynamic tests aimed at allowing high-speed trains. Comprehensive DFOS-based data supported by an automatic inclinometer system will be the basis for the expert’s technical assessment and decision.

Technical specifications

110 000 measurement points
2 200 mof sensing path
44 x EpsilonFlat
dynamic tests & long-term

Example results

Recomendations (optional)

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John Doe

Project partner

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