基于柱矢量模式的光纤迈克尔逊传感特性研究  

Cylindrical vector modes based Michelson interferometer with vortex fiber for sensing applications

作　　者：杨俊锋[1] 庞拂飞[2] 刘奂奂 赵欣[1] 崔乃忠[1] YANG Junfeng;PANG Fufei;LIU Huanhuan;ZHAO Xin;CUI Naizhong(Tangshan Key Laboratory of New Intelligent Sensing Technology,Department of Physical Science and Technology,Tangshan Normal University,Tangshan,Hebei 063000,China;Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai University,Shanghai 200444,China;Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,Guangdong 518055,China)

机构地区：[1]唐山师范学院物理科学与技术学院、唐山市新型智能传感技术重点实验室,河北唐山063000 [2]上海大学特种光纤与光接入网重点实验室,上海200444 [3]南方科技大学电子与电气工程系,广东深圳518055

出　　处：《光电子．激光》2023年第12期1241-1248,共8页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61975108);河北省高等学校科学技术研究项目(ZC2021031);唐山市科技计划项目(20130219b,2022TS004b);唐山师范学院博士基金项目(2021A01)资助项目。

摘　　要：基于涡旋光纤(vortex fiber,VF)激发的柱矢量模式(cylindrical vector modes,CVMs)设计了迈克尔逊干涉仪传感器,并对轴向应变、温度和折射率传感特性进行了理论研究和实验验证。通过对VF施加一个微弯长周期光栅(microbend long period gratings,MLPG),激发一阶CVMs(TE01、HE21和TM01);在VF尾端加反射镜,反射后纤芯中的基本模式HE11与环芯中的CVMs产生干涉,构成了迈克尔逊干涉仪。实验测得对应于柱矢量模式TM01、HE21和TE01的应变灵敏度分别为-1.01 nm/mε、-1.61 nm/mε和-2.31 nm/mε,温度灵敏度分别为9.3 pm/℃,3.4 pm/℃和-2.4 pm/℃,而折射率不敏感。该传感器结构简单,且TE01模式具有最高应变灵敏度和最低温度灵敏度,可作为折射率不敏感的、温度交叉灵敏度低的理想无补偿应变传感器,是智能型工程结构中下一代传感器的理想选择。Michelson interferometer sensor based on cylindrical vector modes(CVMs)in a vortex fiber(VF)has been proposed and demonstrated.The sensing characteristics of axial strain,temperature,and refractive index have been studied using theoretical and experimental methods.By applying a microbend long period grating(MLPG)to the VF,the first-order CVMs of TEo1,HE2r and TMo1 modes are excited.The end of the VF is equipped with a mirror,which interferes with the fundamental mode HEn in the fiber core and the CVMs in the ring core after reflection,constructing an in-fiber Michelson interferometer sensor.The sensor exhibits the strain sensitivity of-1.01 nm/me,-1.61 nm/me,-2.31 nm/me and the temperature sensitivity of 9.3 pm/℃,3.4 pm/℃,-2.4 pm/℃for the CVMs of TMo1,HEer and TEo respectively.But it is insensitive to refractive index The sensor has a simple structure.The TEor mode has the highest strain sensitivity and the lowest temperature sensitivity.It can be used as an ideal uncompensated strain sensor with insensitive refractive index and low temperature cross sensitivity.It has potential application of the next-generation sensors in smart engineering structures.

关 键 词：柱矢量模式(CVMs) 迈克尔逊干涉仪 涡旋光纤(VF) 光纤传感 

分 类 号：TP212.14[自动化与计算机技术—检测技术与自动化装置]