Research And Realization Of Train Axle Counting System Based On Fbg

A train axle counting system with high demodulation frequency achieved by edge filter demodulation technology of a Fiber Bragg grating (FBG)is proposed. The adoption of the edge filter demodulation technology makes the demodulation frequency reach 20kHz, the demodulation accuracy reach ±1.5pm. Install multiple sensing points on a track owned by a railway signal limited liability company to build a system for performance testing. The experimental results show that the system has the ability to count the axles and determine the direction of travel of high-speed trains. The high demodulation frequency and security of this method is suitable for track occupation status monitoring in the track communication signal control field.