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Various parameters are measured to increase the safety of train operation and monitor the railway infrastructure. This contribution presents a monitoring system using an optical fiber Fabry-Pérot interferometer for speed measurement. The speed of the train was determined from the known distance of two sensors placed on the foot of the rail rather than the known geometry of the train. During the measurement campaign on the railway line in Slovakia, more than 70 train passages were determined. The speeds (from 15 km/h to 67 km/h) were divided into five groups and compared with the speeds determined by a piezoelectric-based sensor. Easy installation, a simple evaluation of the measured signal, and low sensor production costs, make the proposed sensor a good candidate for railway monitoring applications.
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Daniel Káčik, Ivan Martincek, Norbert Tarjanyi, Matej Goraus, "Railway monitoring system using optical fiber Fabry-Pérot interferometer," Proc. SPIE 12139, Optical Sensing and Detection VII, 121391B (17 May 2022); https://doi.org/10.1117/12.2620017