基于EFPI和FBG传感器的光纤智能夹层系统研究

Fiber-Optic Smart Layer System by Using EFPI and FBG Sensors

以光纤自诊断系统为研究对象,围绕光纤智能夹层(FOSL)制作和标定中的相关理论及技术展开较深入的研究。采用聚酰亚胺薄膜制作了基于非本征法布里珀罗干涉型(EFPI)传感器和光纤布拉格光栅(FBG)传感器的FOSL。制作过程中,光纤传感器性能完好,FOSL的埋入对复合材料强度影响较小。在此基础上,对FOSL试件中的EFPI和FBG传感器进行了四点弯曲试验。试验表明,FOSL中,EFPI传感器的应变与载荷、FBG波长偏移与应变之间均具有良好的线性关系;在FOSL的制作中,可以选用EFPI和FBG传感器同时监测结构应变和温度。利用FOSL中的光纤传感器网络和先进信息处理技术,可以建立结构损伤主动、在线和实时监测系统。

With the view to investigating the general optical fiber self-diagnosing system, the correlative theories and technology for manufacturing and calibration of the fiber optic smart layer (FOSL) have been studied extensively. FOSL with built-in extrinsic Fabry-Perot interferometric (EFPI) and fiber Bragg grating (FBG) sensors are fabricated with dielectric substrate of polyimide. Fiber optic sensors embedded inside FOSL are in the good condition in the process of manufacturing and the structural strength of the host composites with built-in FOSL is not to degrade obviously. Furthermore, EFPI and FBG sensors embedded inside FOSL are performed by using the four-point bending test. The test results present that the strain by EFPI sensor is linear to loading of bending beam and the wavelength shift of Bragg grating is excellent linear with strain of bending beam. Both EFPI and FBG sensors could be embedded in FOSL and used for monitoring strain and temperature simultaneously. Active and real time monitoring system would be established by fiber optic sensors networks and self-diagnosing modules embedded in FOSL.