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

<div>Error of the infrared laser rangefinders and pull-wire convergence meters. (a) PDF of infrared laser rangefinders. (b) Errors of pull-wire convergence meters.</div>

Advances in Civil Engineering

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Figure 5

Figure 5: Health Monitoring System with Hybrid Laser Sensor Networks and Cloud Computing for Subway Tunnels 