Development of a Fiber-Optic Sensing System for Train Vibration and Train Weight Measurements in Hong Kong

Table 1

The result of the four approaches.

Up track
Error %	Approach 1	Approach 2	Approach 3	Approach 4
FBG 1,2	11.51	12.51	14.39	12.48
FBG 3,4	11.53	13.10	12.59	9.94
Down track
Error %	Approach 1	Approach 2	Approach 3	Approach 4
FBG 1,2	14.43	14.37	12.00	9.40
FBG 3,4	12.36	12.82	12.34	9.74