Abstract:

       We develop a temperature-unaware fiber Bragg grating (FBG) displacement sensor in view of big labor-consumption in the monitoring of railway roadbed deformation and no acquisition of real-time road information. It has the measurement range of 100 mm and measurement accuracy of 0.1 mm. Data analysis of more than two months scene test shows that the designed sensor can reflect the real-time information of the railway roadbed deformation, especially for the information of the negative influence of precipitation on the rate of roadbed deformation.

Key words: optical fiber sensor technology, roadbed deformation, fiber Bragg grating (FBG), real-time remote monitoring