基于预扭制保偏光纤Sagnac环形镜结构的光纤扭转传感器  

Optical Fiber Torsion Sensor Based on Pre-Twisted Polarization-Maintaining Fiber Sagnac Loop Mirror Structure

作　　者：宋卓 李依纯 韦金朋 胡君辉[1] Song Zhuo;Li Yichun;Wei Jinpeng;Hu Junhui(College of Physical Science and Technology,Guangxi Normal University,Guilin,Guangxi 541004,China)

机构地区：[1]广西师范大学物理科学与技术学院,广西桂林541004

出　　处：《激光与光电子学进展》2021年第17期211-218,共8页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61565002);广西重点研发计划(AB18221033);广西高等学校千名中青年骨干教师培育计划(20181127)。

摘　　要：提出了一种基于预扭制保偏光纤(PMF)Sagnac环形镜结构的光纤扭转传感器,该传感器可以同时实现扭转方向的判别和扭转角度的测量。此结构的传感部分由熔接在两段2 mm长的多模光纤(MMF)中间2 cm长预扭制的熊猫型PMF构成,通过透射光谱中谐振波谷波长或功率变化的测量,实现扭转方向判别和扭转角度的测量。实验结果表明,该传感器具有较高的灵敏度。逆时针扭转时,谐振波谷波长随着扭转角度的增大发生蓝移,波长灵敏度最大为-455 pm·rad^(-1)·m,功率灵敏度为-1.35 dB·rad^(-1)·m;顺时针扭转时,谐振波谷波长随着扭转角度的增大发生红移,波长灵敏度最大为182 pm·rad^(-1)·m,功率灵敏度为2.20 dB·rad^(-1)·m。该传感器具有结构和制作简单、成本低廉等优点,在扭转或者旋转测量领域具有潜在的应用前景。An optical fiber torsion sensor based on a pre-twisted polarization-maintaining fiber(PMF)Sagnac loop mirror structure is proposed and experimentally demonstrated for simultaneously measuring rotational angle and direction.The sensing part of the structure is composed of a 2-cm pre-twisted Panda-type PMF spliced between two segments of 2-mm length multimode fiber(MMF).Torsion direction discrimination and torsion angle measurement can be realized by measuring the wavelength and power of a resonant dip in transmission spectra.The experimental results show that the sensor has a high sensitivity,and the resonant dip shifts with changes in torsion angle and direction.The wavelength of the resonant dip blue-shifts as the torsion angle increases,with a maximum wavelength sensitivity of-455 pm·rad^(-1)·m and a power sensitivity of-1.35 dB·rad^(-1)·m for counterclockwise torsion.For clockwise torsion,the wavelength of the resonant dip red-shifts as the torsion angle increases,with a maximum wavelength sensitivity of 182 pm·rad^(-1)·m and a power sensitivity of 2.20 dB·rad^(-1)·m.The sensor has the advantages of simple structure,easy fabrication,low cost,and potential applications in the field of torsion or rotation measurement.

关 键 词：光纤光学 光纤传感器 保偏光纤 SAGNAC环 扭转测量 

分 类 号：O436[机械工程—光学工程]