Bridge Structural Health Monitoring Method Research Based On Optical Fiber Sensing Technology Research

Health monitoring system for domestic and foreign large-scale civil engineering demand for monitoring method,reserched a kind of bridge structural health monitoring method based on optical fiber sensing technology.Bridge structural health monitoring system includes intelligent monitoring system,signal demodulation system.This article used the reference grating method to design the test system used by the optical fiber grating sensor,and used the metal tube type encapsulation structure of sensor for encapsulation.According to theoretical analysis,was proposed based on the F-P filter method of wavelength of fiber grating sensor demodulation scheme.Of the fiber Bragg grating sensor and sensor signal demodulation scheme designed experimental verification.Finally by mechanics and theory of poisson's ratio,analyzed the bridge structure amplitude grating axial strain relationships.Designed of bridge structure health monitoring system,the strain sensitivity of fiber Bragg grating sensor for the 1.23 PM /,the temperature sensitivity of 10.8 PM / ?.Experiments show that reference grating method is used to design the optical fiber grating sensor,signal demodulation scheme based on F-P filter method,has reached the requirement of bridge structural health monitoring.