基于涂覆Pd/WO3膜的长周期光纤光栅氢气传感器设计  

Design of long-period fiber grating hydrogen sensor based on Pd/WO coating

作　　者：潘雨婷 牛海莎 骆飞[1] 张健[1] 李天舒 PAN Yu-ting;NIU Hai-sha;LUO Fei;ZHANG Jian;LI Tian-shu(Institute of Instrument Science and Photoelectric Engineering,Beijing Information Science and Technology University,Beijing 100192,China)

机构地区：[1]北京信息科技大学仪器科学与光电工程学院,北京100192

出　　处：《光电子．激光》2020年第10期1089-1094,共6页Journal of Optoelectronics·Laser

基　　金：高等学校学科创新引智计划资助(先进光电子器件与系统学科创新引领基础D17021)助项目。

摘　　要：氢气浓度的高精度、快速监测在众多领域具有重要意义。本文提出一种基于涂覆Pd/WO3膜的长周期光纤光栅氢气浓度传感器。首先研究了镀Pd/WO3膜的LPFG对氢气的传感特性,利用光学仿真软件模拟了薄膜折射率在1.99-2.0范围内的传感情况,仿真结果表明当氢气浓度增加时,Pd/WO3薄膜折射率降低,LPFG透射谱谐振波长蓝移,谐振波长偏移对Pd/WO3薄膜折射率变化的灵敏度为256.9 nm/RIU。为了增强镀膜LPFG氢气传感器的灵敏度,进一步研究了包层半径及周期对其谐振波长灵敏度的影响,结果表明LPFG的谐振波长灵敏度随周期Λ的增大而增加;在相同周期的条件下,包层半径越小,谐振波长的偏移值越大,该研究对开发高灵敏度可复用的光纤氢气传感器具有重要指导意义。High-precision and rapid monitoring of hydrogen concentration is of great significance in many fields.In this paper,a long-period fiber grating hydrogen concentration sensor based on Pd/WO3 film is proposed.First,the hydrogen sensing characteristics of Pd/WO3 film-coated LPFG are studied.The optical simulation software is used to simulate the sensing conditions of the film with a refractive index in the range of 1.99-2.0.The simulation results show that when the hydrogen concentration increases,Pd/WO3 film When the refractive index decreases,the resonance wavelength of the LPFG transmission spectrum is blue shifted,and the sensitivity of the resonance wavelength shift to the refractive index change of the Pd/WO3 film is 256.9 nm/RIU.In order to enhance the sensitivity of the coated LPFG hydrogen sensor,the effect of the cladding radius and period on the resonance wavelength sensitivity was further studied.The results show that the LPFG resonance wavelength sensitivity increases with the increase of the periodΛ;under the same period,the cladding The smaller the radius,the larger the offset value of the resonant wavelength.This research has important guiding significance for the development of highly sensitive and reusable fiber optic hydrogen sensors.

关 键 词：长周期光纤光栅 Pd/WO3 光栅周期 包层半径 折射率传感器 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TN247[自动化与计算机技术—控制科学与工程]