Development of Optic-Electric Hybrid Sensors for the Real-Time Intelligent Monitoring of Subway Tunnels

Figure 5

Calibration results of optic-electric hybrid sensors: (a) 1#; (b) 3#; (c) 5#; (d) 7#; (e) 9#; (f) 11#.

(a)

(b)

(c)

(d)

(e)

(f)