Keywords: railway, measuring systems, laser Doppler vibrometer.

Railway bridges are an important part of the railway transport infrastructure. They require large investments during their construction and maintenance process. Railways bridges are also a kind of bottleneck in the railway transportation system. In the case of any damage, the whole railway system has be closed to the railway operation. A laser Doppler vibrometer, which is a member of non-contact measurement systems family, is used to make vibration measurements of a surface. Vibration and displacements on structures can be detected quickly and effortlessly even over long distances. The laser Doppler vibrometer cameras are designed for condition monitoring and testing of dynamics of structures from a remote distance with a simple point-and shoot operation. Its advanced laser Doppler interferometer technology saves time by avoiding contact sensor installations and it is ready to use for trouble shooting for any vibrational issue. This paper introduces a study of advanced vibration measurement for bridges using laser Doppler vibrometers, which makes it possible to conduct highly accurate, non-contact and long distance measurement. In addition, a comprehensive literature survey was completed and the most important research on railway bridge monitoring are presented in this paper. A railway bridge, the Weiherfeld Bridge in Karlsruhe, Germany, was selected and field tests were completed. The high quality signals enabled the adequate evaluation of the railway bridge.

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