Health Monitoring System with Hybrid Laser Sensor Networks and Cloud Computing for Subway Tunnels

Figure 9

PIV total displacement nephogram. (a) First-level loading at point 1. (b) Second-level loading at point 1. (c) First-level loading at point 2. (d) Second-level loading at point 2. (e) First-level loading at point 3. (f) Second-level loading at point 3.

(a)

(b)

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(f)