Study of a Space-Time Monitoring of High-Speed Railway Underline Structure Using Distributed Optical Vibration Sensing Technology

Figure 16

Vibration signal of the left track line before L00526 repair: (a) 1^st Train; (b) 2^nd Train; (c) 3^rd Train; (d) 4^th Train.

(a)

(b)

(c)

(d)