Fibre optic track vibration monitoring system

Abstract

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Fiber-optic interferometric sensor for monitoring automobile and rail traffic

“…As described by the authors, for example, snow and black ice reduce the efficiency of these systems. As for nondestructive installation, [32] and [33] come closest to the topic. An alternative track vibration monitoring system based on the two-arm Mach-Zehnder interferometer has been proposed, demonstrated, and tested along a single railway track in the Prague subway system [32].…”

“…As for nondestructive installation, [32] and [33] come closest to the topic. An alternative track vibration monitoring system based on the two-arm Mach-Zehnder interferometer has been proposed, demonstrated, and tested along a single railway track in the Prague subway system [32]. Two passive detection systems placed 50 m and 1.3 km away from the control room were used to measure tunnel vibrations triggered by passing trains free from the effect of any unrelated EMI existing in the subway tunnel.…”

Use of Fiber-Optic Sensors for the Detection of the Rail Vehicles and Monitoring of the Rock Mass Dynamic Response Due to Railway Rolling Stock for the Civil Engineering Needs

“…A change in the geometry of the optical fiber because of the pressure exerted on the fiber by a passing railway vehicle changes the speckle images of the measuring fiber. The work in [23] described the use of a Mach-Zehnder fiber-optic interferometer to monitor car traffic, for detecting vehicles, and measuring their speed. A Mach-Zehnder interferometer for rail transport was described in [24], which analyzed the use of a three-armed Mach-Zehnder interferometer in rail traffic as a traffic density detector.…”

Fiber Optic Train Monitoring with Distributed Acoustic Sensing: Conventional and Neural Network Data Analysis

“…Fiber optic sensing techniques such strain sensors based on Brillouin scattering [7,8], fiber Bragg gratings and fiber interferometers [9,10] have been demonstrated in railway applications. However, most activities in the field of DAS have centered on Raleigh backscatter based (C-OTDR) systems [6,7,11,12]. Two main DAS techniques can be distinguished.…”