Monitoring system of railway track based on identity weak fiber Bragg grating array

Cui, 张翠 Zhang; Yuan, 陶 渊 Tao; Xinglin, 童杏林 Tong; Chengwei, 邓承伟 Deng; Wei, 何 为 He; Weibing, 甘维兵 Gan; Lixin, 王立新 Wang

doi:10.3788/irla201948.0622001

Cited by 2 publications

(4 citation statements)

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“…When the signal light incident reaches the weakly reflective fiber Bragg grating, a very small portion of the signal light consistent with the center wavelength of the fiber Bragg grating is reflected back by the fiber grating, and the majority of the remaining light signal continues forward until the next weakly reflective fiber Bragg grating, where the same effect continues to occur, and then continues so until the last fiber Bragg grating in the sequence, as shown in the change in the wavelength of the grating center received by the detection system [5] .…”

Section: Weak Fiber Grating Sensing Technology Principlementioning

confidence: 99%

Application of weak fiber grating sensing technology in landslide monitoring

Lv,

Zhang,

Wang

et al. 2023

AOPC 2023: Optic Fiber Gyro

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Weak fiber grating sensing technology has started to be applied in various fields, and its introduction into landslide monitoring can realize comprehensive monitoring of points, lines and surfaces. In this paper, on the basis of introducing the principle of weak fiber grating, weak grating displacement sensor, inclination sensor, weak grating optical cable and weak grating demodulator are combined to build a weak grating sensing real-time monitoring system, and finally a weak grating real-time monitoring application test of a landslide is given. The test results show that the weak fiber grating sensing real-time monitoring system can achieve real-time monitoring of landslides, and its experience can be extended to other landslides of weak fiber monitoring.

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Section: Weak Fiber Grating Sensing Technology Principlementioning

confidence: 99%

Application of weak fiber grating sensing technology in landslide monitoring

Lv,

Zhang,

Wang

et al. 2023

AOPC 2023: Optic Fiber Gyro

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“…The redundant optical fiber between the two sleepers in a 2-m spatial resolution TDM system will be too long, which makes it prone to damage by rail traffic and external disturbances. According to a previous finite-element analysis of a track-train system [ 26 ], the deformation is greatest in the middle of the track between two sleepers. If one FBG is placed between every two sleepers, a spacing of 1 m between each sensor is most appropriate.…”

Section: Optical System: the Low-reflectivity Fbg Array And Its Multiplexing Networkmentioning

confidence: 99%

“…The only method currently available is to attach a sensor unit to the track with special fixtures. Zhang’s previous finite element analysis of the train-track system leads to the following conclusions: when the load is directly over the sleeper, track deformation is smallest, and stress is mainly concentrated at the track head; when the load is applied right between two sleepers, the track deformation and stress are the greatest, and the maximum deformation of the track is at the track head and waist [ 26 ]. Therefore, an FBG sensor should be installed between two sleepers and near the rail waist and railhead for maximum strain-sensing capability.…”

Section: Mechanical Systems: Train-track Force Analysis and Sensor Encapsulation Sizementioning

confidence: 99%

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Opto-Mechatronics System for Train-Track Micro Deformation Sensing

Gan

Tao

et al. 2021

Sensors

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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.

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Monitoring system of railway track based on identity weak fiber Bragg grating array

Cited by 2 publications

References 0 publications

Application of weak fiber grating sensing technology in landslide monitoring

Application of weak fiber grating sensing technology in landslide monitoring

Opto-Mechatronics System for Train-Track Micro Deformation Sensing

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