基于细芯光纤马赫-曾德干涉和曲率修正模型的高灵敏度光纤曲率传感器  

High sensitivity curvature sensor based on thin core fiber MachZehnder interferometer with a curvature corrected model

作　　者：冯爱明[1] 帅少杰 孙志强[1] 刘泽旭[1] 肖亦可 宫佳琪 楼伟民[1] 申屠锋营 严洒洒 金尚忠[1] 郎婷婷[1] 沈常宇[1] FENG Ai-ming;SHUAI Shao-jie;SUN Zhi-qiang;LIU Ze-xu;XIAO Yi-ke;GONG Jia-qi;LOU Wei-mi;SHENTU Feng-ying;YAN Sa-sa;JIN Shang-zhong;LANG Ting-ting;SHEN Chang-yu(College of Optical and Electronic Science and Technology ,China Jiliang University, Hangzhou 310018 ,China)

机构地区：[1]中国计量大学光电子技术研究所,浙江杭州310018

出　　处：《光电子．激光》2018年第7期691-697,共7页Journal of Optoelectronics·Laser

基　　金：国家自然科学重大仪器专项(61727816);浙江省自然科学基金(LY16A040005);浙江省公益项目(LGG18F050003)资助项目

摘　　要：提出了一种基于细芯光纤结合Mach-Zehnder干涉仪的高灵敏度曲率传感器,传感头由一段细芯光纤嵌入在两段的单模光纤中错位熔接而成。当干涉仪受到弯曲作用时,由于细芯光纤和单模光纤的错位熔接,使得纤芯和包层模光强度产生损耗,在一定曲率范围内使得纤芯和包层模光强度更加接近而导致干涉增强,通过研究特定干涉峰的干涉强度相对于曲率的变化关系,可以实现光纤曲率传感。为了增加曲率的校准精度,提出了一种基于悬链线法的光纤弯曲的曲率修正模型。实验结果表明:利用曲率修正模型修正后,在9.15m^(-1)到11.02m^(-1)的范围内的曲率测量灵敏度达到142.28dB/m^(-1)。这种基于强度变化的低成本、高灵敏曲率传感器,具有广阔的应用前景。A high sensitivity curvature sensor based on thin core fiber （TCF） and Mach-Zehnder interferometer （MZI） structure is proposed.The sensor head is fabricated by a c ore-offset splicing of a TCF in two SMFs.As the MZI becomes bent,the interference between the core and clad ding modes is enhanced due to core-offset.The optical fiber curvature sensor can be realized by detec ting the changes of interference intensities to the variation of curvature.To improve the accuracy of the curvature calibration,a curvature corrected model is obtained by using the fiber curve catenary method. The experimental results show that the curvature sensitivity of 142.28dB/m^-1 is obtained in the c urvature range of 9.15m^-1 to 11.02m^-1. This high sensitivity,low coat and intensity demodulation fiber curvature senso r has broad application prospects.

关 键 词：光纤传感器 细芯光纤 曲率传感器 

分 类 号：TN253[电子电信—物理电子学]