Opto-Mechatronics System for Train-Track Micro Deformation Sensing

作者：Weibing Gan, Shiyu Tu, Tao Yuan, Lingyun Ai, Cui Zhang, Jianguan Tang · 发表于：Sensors · 年份：2021 · DOI：10.3390/s22010296 · 被引用次数：9 · 研究领域：Advanced Fiber Optic Sensors、Railway Engineering and Dynamics、Semiconductor Lasers and Optical Devices

In this paper, we proposed and experimentally demonstrated an opto-mechatronics system to detect the micro-deformation of tracks caused by running trains. The fiber Bragg grating (FBG) array acting as sensing elements has a low peak reflectivity of around -40 dB. The center wavelengths were designed to alternate between 1551 nm and 1553 nm at 25 °C. Based on dual-wavelength, wavelength-division multiplexing (WDM)/time-division multiplexing (TDM) hybrid networking, we adopted optical time-domain reflectometry (OTDR) technology and a wavelength-scanning interrogation method to achieve FBG array signal demodulation. The field experimental results showed that the average wavelength shift of the FBG array caused by the passage of the lightest rail vehicle was -225 pm. Characteristics of the train-track system, such as track occupancy, train length, number of wheels, train speed, direction, and loading can be accurately obtained in real time. This opto-mechatronics system can meet the requirements of 600 mm spatial resolution, long distance, and large capacity for monitoring the train-track system. This method exhibits great potential for applications in large-scale train-track monitoring, which is meaningful for the safe operation of rail transport.