基于并联游标效应的MZ光纤应变传感器增敏解调系统  

Sensitization and demodulation system of MZ optical fiber strain sensor based on parallel vernier effect

作　　者：王婷婷[1] 柯炜[2] 王秀婷 WANG Tingting;KE Wei;WANG Xiuting(College of Electronics and Information Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;School of Computer and Electronic Information/School of Artificial Intelligence,Nanjing Normal University,Nanjing 210023,China)

机构地区：[1]南京信息工程大学电子与信息工程学院,南京210044 [2]南京师范大学计算机与电子信息学院/人工智能学院,南京210023

出　　处：《光通信技术》2024年第1期13-17,共5页Optical Communication Technology

基　　金：国家自然科学基金项目(61405094)资助;江苏高校优势学科Ⅲ期建设工程项目资助。

摘　　要：为了进一步提高马赫-曾德尔(MZ)光纤应变传感器的灵敏度,设计了一种基于并联游标效应的MZ光纤应变传感器增敏解调系统。该系统由传感干涉仪和参考干涉仪并联组成,2个干涉仪都是单模-无芯-少模-单模(SNFS)结构的马赫-曾德尔干涉仪(MZI)。通过提取2个SNFS-MZI传输信号的差频成分并跟踪其波谷的移动,提高系统应变灵敏度。此外,通过单独提取参考干涉仪的干涉谱,从而消减应变测量时的温度串扰。实验结果表明:该系统的应变灵敏度为7.39 pm/με,约为单个传感干涉仪的应变灵敏度5倍;通过调节参考干涉仪和传感干涉仪的传感臂长,可以灵活调节MZ光纤应变传感器增敏解调系统的灵敏度性能。In order to improve the sensitivity of Mach-Zender(MZ)optical fiber strain sensor,a MZ optical fiber strain sensor sensitization demodulation system based on parallel cursor effect is designed.The system consists of a sensing interferometer and a reference interferometer in parallel,both of which are Mach-Zehnder interferometer(MZI)with a single mode fiber-no-core fiber-few-mode fiber-single mode fiber(SNFS)structure.By extracting the difference frequency components of two SNFS-MZI signals and tracking the movement of their troughs,the strain sensitivity of the system is improved.In addition,the temperature crosstalk during strain measurement is reduced by extracting the interference spectrum of the reference interferometer separately.The experimental results show that the strain sensitivity of the system is 7.39 pm/με,which is about 5 times that of a single sensor interferometer.By adjusting the sensing arm length of the reference interferometer and the sensing interferometer,the sensitivity performance of the MZ optical fiber strain sensor sensitization demodulation system can be flexibly adjusted.

关 键 词：光纤光学 马赫-曾德尔干涉仪 并联游标效应 应变 温度串扰 

分 类 号：TN253[电子电信—物理电子学]