Author(s)

Lu Zhang, Jianjun Pan, Zhixin Wang, Rong Zhou, Jinfeng Lin and Chunxiao Wu

Corresponding Author

Lu Zhang

ABSTRACT

A simple, low cost and high demodulation speed axle counter system is realized by using fiber Bragg grating (FBG) sensor and edge filter. FBG sensor axle counting system uses FBG to detect the change of rail strain in the process of wheel rail coupling to realize the train axle counting. In order to meet the need of high speed and low cost demodulation method of fiber Bragg grating, a fast demodulation of wavelength is realized by using optical circulator, 3dB optical coupler and optical filter. The experimental results show that this demodulation method has obtained linearity higher than 0.99 in the strain detection test. In the field experiment of FBG sensor axle counter system, the signal-to-noise ratio is more than 24dB, which meets the application requirements of train axle counter and direction determination.

KEYWORDS

Edge filter component; intensity demodulation; fiber Bragg grating; axle counter