D形光纤Bragg光栅弯曲灵敏度的理论和实验研究  

Theoretical and Experimental Investigation of the Bending Sensitivity of the D-shaped Fiber Bragg Gratings

作　　者：周金龙[1] 董小鹏[1] 石志东[2] 

机构地区：[1]厦门大学信息科学与技术学院光波技术研究所,厦门361005 [2]上海大学光纤研究所,上海208100

出　　处：《光子学报》2006年第11期1734-1737,共4页Acta Photonica Sinica

基　　金：国家自然科学基金(60177026);福建省自然科学基金(0012-K32008)资助

摘　　要：用材料力学理论分析了D形光纤Bragg光栅(D-shaped fiber Bragg grating,D-FBG)以及常规光纤Bragg光栅由弯曲引起的轴向应变,得到了光栅Bragg波长漂移的弯曲敏感特性.实验结果和理论计算结果基本相符.与常规FBG相比,该D-FBG的弯曲灵敏度要高近80倍.因此D-FBG可以直接应用于弯曲形变的测量,以及间接应用于压力、加速度等物理量的测量.理论分析和实验结果对采用该类型光纤光栅的器件和传感系统的设计具有参考意义.The axial strain of D-shaped fiber Bragg grating （D FBG） and normal fiber Bragg grating induced by bending was analyzed with mechanics of materials. Bending sensitivity charaeleristic of Bragg wavelength＇s shift was obtained. Experiment result was in good agreement with the theory analysis. DFBG＇s bending sensitivity was about 80 times higher than normal circularly symmetrical FBG. The studied DFBG can be directly applied in bending measurement, and indirectly in pressure or acceleration measurement. The theory analysis and experiment result was helpful for the design of device or sensor system using D-FBG.

关 键 词：D形光纤Bragg光栅 光纤弯曲传感 光纤光栅传感器 

分 类 号：TN253[电子电信—物理电子学]