基于纤芯失配与错位熔接的光纤Mach-Zehnder温度折射率双参量传感器  

Mach-Zehnder Interferometer Based on Fiber Core Mismatch and Core-Offset Splicing for the Simultaneous Sensing of Temperature and Refractive Index

作　　者：宗书尧 文晓艳 张东生[2] Zong Shuyao;Wen Xiaoyan;Zhang Dongsheng(School of Science,Wuhan University of Technology,Wuhan,Hubei 430070,China;National Engineering Laboratory for Fiber Optic Sensing Technology,Wuhan University of Technology,Wuhan,Hubei 430070,China)

机构地区：[1]武汉理工大学理学院,湖北武汉430070 [2]武汉理工大学光纤传感技术国家工程实验室,湖北武汉430070

出　　处：《激光与光电子学进展》2020年第17期108-114,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(11974266,11704293);中央高校基本科研基金(WUT2019IB014,WUT2018IB008)。

摘　　要：介绍了一种基于纤芯失配与错位熔接的光纤Mach-Zehnder干涉仪,实现了折射率-温度双参量传感。将带有凸锥结构的多模光纤段与错位熔接接头作为两个耦合单元,其中凸锥结构增加了包层模式能量,提高了传感器透射谱对比度。改变外界环境折射率和温度,通过监测透射谱中两个波谷的特征波长漂移量,建立传感矩阵。实验结果表明,在折射率为1.3449~1.3797、温度为25~65℃的范围内,折射率和温度灵敏度分别为-25.682 nm/RIU(RIU为单位折射率)和0.073 nm/℃。本传感器具有制作简单、成本低等特点,在温度、折射率等多参数检测方面具有应用前景。A Mach-Zehnder interferometer based on fiber core mismatch and core-offset splicing is proposed and experimentally tested for the simultaneous measurement of refractive index and temperature.The sensor structure consists of a multi-mode fiber segment with an up-taper structure and a core-offset joint as two coupled units.The up-taper increases the light energy propagating in the fiber cladding,which improves the fringe visibility.Wavelength shifts were recorded for two transmission dips,associated with variations in the temperature and refractive index,respectively,to build up a sensing matrix for the device.The experimental results show that the sensitivities to changes in the refractive index and temperature are-25.682 nm/RIU and 0.073 nm/℃ within the refractive-index range 1.3449-1.3797 and temperature range 25-65℃.The proposed sensor is easy to fabricate and has low cost,so we believe that it has application prospects for various types of multi-parameter detection,including temperature,refractive index,etc.

关 键 词：光纤光学 MACH-ZEHNDER干涉仪 纤芯失配 错位熔接 折射率 温度 

分 类 号：TN253[电子电信—物理电子学]