基于双峰谐振长周期光纤光栅的海水盐度传感器  

A seawater salinity sensor based on dual peaks resonance long period fiber grating

作　　者：杜超[1] 赵爽[1] 宋桦可 王秋雨 贾斌 张丽[1] 崔丽琴[1] 赵强 邓霄[2] DU Chao;ZHAO Shuang;SONG Hua-ke;WANG Qiu-yu;JIA Bin;ZHANG Li;CUI Li-qin;ZHAO Qiang;DENG Xiao(College of Electronic Information and Optical Engineering,Taiyuan University of Technology,Taiyuan 030024,China;College of Physics,Taiyuan University of Technology,Taiyuan 030024,China;Institute of Oceanographic Instrumentation,Qilu University of Technology(Shandong Academy of Sciences),Qingdao 266061,China)

机构地区：[1]太原理工大学电子信息与光学工程学院,山西太原030024 [2]太原理工大学物理学院,山西太原030024 [3]齐鲁工业大学(山东省科学院)海洋仪器仪表研究所,山东青岛266061

出　　处：《中国光学（中英文）》2024年第2期291-299,共9页Chinese Optics

基　　金：国家自然科学基金(No.62203320,No.62375198,No.52009088,No.61933004);中国博士后科学基金面上项目(No.2019M661063);山西省回国留学人员科研资助项目(No.2023-039);崂山实验室科技创新项目(No.LSKJ202204703)。

摘　　要：为研制高灵敏海水盐度传感器,本文基于CO_(2)激光技术成功制备出一种工作在色散转折点(DTP)附近的长周期光纤光栅(LPFG)。首先,利用CO_(2)激光器在80μm细单模光纤上制备出工作在DTP附近的LPFG,证明了采用CO_(2)激光微加工技术制备较短周期LPFG的可能性。其次,通过调控CO_(2)激光器的制备周期,使高阶包层模式LP_(1,9)工作在DTP附近,从而显著提高了LPFG的折射率灵敏度。在双峰谐振增敏效应的作用下,当海水盐度从5.001‰变化到39.996‰时,光栅周期为115.4μm的双峰谐振LPFG平均灵敏度高达0.279 nm/‰。研究结果表明,本文制备的LPFG海水盐度传感器具有谐振损耗大和灵敏度高的优点,其在海水盐度监测领域具有较好的应用前景。To develop a highly sensitive seawater salinity sensor,a long period fiber grating(LPFG)was successfully fabricated using CO_(2)laser technology to function in close proximity to the dispersion turning point(DTP).An LPFG operating near DTP was fabricated in an 80μm single mode fiber using CO_(2)laser mi-cromachining technology.This successful endeavor demonstrates the feasibility of developing LPFG with shorter grating period using CO_(2)laser micromaching technology.LPFGs with varying periods were fabric-ated by adjusting the preparation period of CO_(2)laser to ensure that the cladding mode LP_(1,9) was operating near DTP,resulting in higher refractive index sensitivity of LPFG.The average sensitivity of 0.279 nm/‰can be achieved in the seawater with salinity ranging from 5.001‰to 39.996‰,especially with the dual peaks resonance LPFG at a period of 115.4μm,thanks to the dual peaks resonance effect.The dual peaks resonance LPFG seawater salinity sensor exhibits high sensitivity and a large attenuation loss,suggesting po-tential application in seawater salinity monitoring.

关 键 词：光纤光学 长周期光纤光栅 色散转折点 海水盐度 CO_(2)激光技术 

分 类 号：TN253[电子电信—物理电子学]