A Novel Self-healing Optical Fiber Network

摘要

The safety and reliability of critical civil infrastructures have been a major concern in all countries around the world.However.structural health monitoring (SHM) still faces a number of challenges.particularly in the area of in-and post-disaster monitoring.In addition,due to the large scale in dimension and complexity in geometry of a typical civil structure,a large number of embedded sensors are required to measure various structural and environmental parameters under normal and extreme conditions.To enhance the survivability of a sensor network for life-cycle structural health monitoring (SHM),this paper presents a novel self-healing sensor netwprk One Spider Orb-Web or network and one hybrid optical fiber(OF) system by combining the local and distributed OF technologies are designed to enhance the tunctionality ofself-healing.Furthermore,three local self-healing sensornodes,which use light switches or couplers,are designed to maintain the measuring connectivity at hot stress point.Finally,A simple Brillouin sensing network withselfhealing nodes is constructed and then validated by the strata measurements ota three-point bend beam.The results show that by using self-healing sensors nodes,the stress state of the RC beam can be successively detected,even when some sensors fail or when the sensing line is broken.