CO_2激光写入的无需温度补偿的拍频型扭曲传感器研究  

Beat Torsion Sensor Without Temperature Compensation Based on Long-Period Fiber Grating Written by CO_2 Laser

作　　者：朱涛[1,2] 史翠华[1] 郑建成[1,2,3] 饶云江[1,2] 史磊磊[1] 

机构地区：[1]重庆大学光电工程学院光电技术及系统教育部重点实验室,重庆400044 [2]电子科技大学通信与信息工程学院宽带光纤传输及通信网络技术教育部重点实验室,四川成都610054 [3]香港城市大学电子工程系

出　　处：《光学学报》2010年第8期2441-2445,共5页Acta Optica Sinica

基　　金：国家自然科学基金(60807019);教育部新世纪人才支持计划(NCET-08-0602);重庆大学骨干教师基金资助课题

摘　　要：高频CO2激光在扭曲的单模光纤上制作的长周期光纤光栅(LPFG)还原后会产生谐振峰分裂现象。基于这种光栅结构,用拍频理论对谐振峰分裂现象和扭曲特性做了解释和分析,实验结果与理论分析相吻合。由于这种光栅的两分裂峰具有几乎一样的温度灵敏度,因此提出可通过测量这种光栅两分裂峰之间的距离来实现扭曲量的测量,并且当扭曲方向不一样时,两分裂峰的距离会变大或变小,因此该扭曲传感器在实现高灵敏度扭曲传感时还可辨别扭曲的方向。这种传感器在工业领域将具有良好的潜在应用价值。The resonance peak of long period fiber grating fabricated in twisted optical fiber by using high-frequency CO2 laser pulses could split into two peaks,after the twist applied to the fiber is removed.The splitting and the torsion characteristic of the special gratings are analyzed and explained by beat-frequency theory.As the temperature sensitivity of the two splitting peaks of the grating is almost the same,it is proposed that torsion can be measured by detecting the interval change between the two splitting peaks when torsion is applied.Besides,the torsion sensor can distinguish torsion direction as the distance of the two splitting peaks increases or decreases when different torsion is applied,therefore,this kind of torsion sensors has a great potential application in high sensibility torsion sensing.

关 键 词：传感器 长周期光纤光栅 拍频 CO2激光 扭曲传感器 

分 类 号：O436[机械工程—光学工程]