Jointless track monitoring system based on Fiber Bragg Grating sensors

Jointless track is an essential part of high speed railway. But the damage such as the buckled rail and the broken rail occasionally happened. In this paper a system is designed for monitoring the status of jointless track based on analyzing the principle of FBG (Fiber Bragg Grating) sensors and the structure of double columns end thorns. The layout of the FBG sensors, including displacement sensors, strain sensors and temperature sensors, which are installed on the end thorns at K761 position on the up line from Suzhou East Station to Bengbu South Station and Huaihe River Bridge on the China high speed line Beijing-Shanghai, is described in detail. Also the remote monitoring system software is introduced in this paper. The results of field tests show that the correlation among temperature, strain and displacement is well and sensors are stable and reliable during a long term remote monitoring.