基于光纤传感技术的轨道占用监测系统设计

Monitoring System of Track Circuit System Based on Optical Fiber Sensor

针对轨道电路计轴方式容易受外界条件变化引起轨道继电器误动作问题,提出了一种新型的光纤计轴方式。该方式以光栅传感解调技术为基础,结合了LabVIEW和ARM微处理器将光纤信号从外部采集到下位机,运用高斯多项式拟合算法、自动寻峰算法、计轴算法和影响因子累加算法进行数据处理,通过以太网使上位机和下位机相互通信,最终实现了光纤信号的数据滤波、寻峰、拟合和轨道电路的列车计轴、方向判断等功能,并将计轴结果存入SQL数据库。结果表明,光纤计轴技术提高了计轴的准确度,增强了对外界环境的抗干扰性,为以后铁道信号监测系统的改进奠定了基础。

A new type of optical fiber optic meter axis is proposed in this study.Based on grating sensor demodulation technology,LabVIEW and ARM microprocessor are combined to collect optical signals from outside to lower computer.The Gaussian fitting method,automatic search peak algorithm,axle data processing algorithm,and the impact factor accumulation algorithm are used to make the upper machine and lower machine communicate with each other via Ethernet.Finally,it realizes the optical signal data filtering,fitting and tracking circuit,peak direction of train axle,judgment,and other functions.Moreover,the data of counting axle is deposited in the SQL database.The results show that the fiber optic axis technology improves the accuracy of the shaft,and enhances the anti-interference of the external environment to setup the foundation for the improvement of the railway signal monitoring system in the future.