Aiming at needs of strain monitoring of rail in railway field

a kind of rail strain monitoring system is proposed

which is based on fiber Bragg grating（ FBG） sensor. From the point of static load monitoring

relation between center wavelength of FBG sensor and change of loading size is studied

when loading is applied at different positions. From the point of monitoring dynamic load

features of center wavelength offset of every FBG sensor center under the cyclic loading is studied. The study shows that

under the static load

offsets of every FBG center wavelength increases along with the increase of load and shows a good linear relationship

and FBG sensor is sensitive to the distance and angle change of the load. Under the cyclic loading

FBG sensing network can realize the real-time monitoring of rail strain and temperature parameters very well. These studies can provide useful references for distributed online monitoring technology of rail strain and damage monitoring.