RESEARCH ON FIBER OPTIC LAMINATES EMBEDDED WITH FBG AND EFPI SENSORS

摘要

Modularize fiber optic laminates can either be surface-mounted on existing structures or integrated into composite structures to implement the health monitoring of structures. The properties of stress for optical fiber sensors which embedded in the interlayer have been studied experimentally. The effect of strain on sensing coefficient is analyzed and the export properties of two kinds of optical fiber sensors which are built in the SMART layer are compared. The experimental results indicate that the relationship between the wavelength change and strain for FBG is linear, but sensitivity of strain for FBG is reduced from 1.2pm/με to 1. 15pm/με; for the extrinsic Fabry-Perot interferometer sensor, the strain has good linear relationship with the load after the strain reach to 350με because of the shortage of facture craffwork. Compared with extrinsic Fabry-Perot interferometer sensor, FBG sensor is preferred stress sensor built in the SMART layer. The SMART layers embedded with FBG sensors are stuck on the interface between wing and body. Experimental results help to monitor the stress of composite materials and structures.