摘要
本文基于TDLAS技术,采用设计制备的微纳光纤气体吸收池,搭建了一套全光纤的NH3浓度检测系统。NH3检测系统的核心部分气体传感通过1.51μm的微纳光纤完成,该系统检测结果表明,NH3在20000 ppm∼100000 ppm浓度范围内,解调的二次谐波幅值与对应浓度之间具有良好的线性关系(拟合方程相关系数R=0.9962)。为了提高NH3浓度的检测性能,采用纳米金涂覆微纳光纤以增强光纤的倏逝场效应。根据实验结果,纳米金涂覆后的微纳光纤NH3浓度检测系统灵敏度有了很大提升,NH3浓度的检测下限可达到260 ppm。对不同浓度的NH3反复监测显示该检测系统稳定性良好,最大相对误差为5.38%,适用于长期稳定性的NH3监测,具有广泛的应用前景。
In this paper,based on TDLAS technology,an all-fiber NH3 concentration detection system was built by using the designed microfiber gas absorption cell.The core part of the NH3 detection system was sensed by a 1.51μm microfiber.The test results of the system indicate that there is a good linear relationship between the second harmonic amplitude and the corresponding concentration for NH3 in the concentration range of 20000 ppm∼100000 ppm(correlation coefficient of fitting formula R=0.9962).To improve the detection performance of NH3 concentration,the gold-nanosphere(GNS)coated microfiber is used to enhance the evanescent field effect.According to the ex-perimental results,the sensitivity of the microfiber coated GNSs NH3 concentration detection system has been greatly improved and the lower detection limit of NH3 concentration can reach 260 ppm.Repeated monitoring of different concentrations of NH3 shows that the detection system is stable with a maximum relative error of 5.38%,which makes it suitable for long-term stable NH3 monitoring and has wide application prospects.
作者
张伟建
曾祥龙
杨傲
滕林苹
邾毅
Zhang Weijian;Zeng Xianglong;Yang Ao;Teng Linping;Zhu Yi(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication,Shanghai Institute for Advanced Communication and Data Science,Shanghai University,Shanghai 200444,China)
出处
《光电工程》
CAS
CSCD
北大核心
2021年第9期16-24,共9页
Opto-Electronic Engineering
基金
国家自然科学基金资助项目(91750108)
上海市科学技术委员会资助项目(20JC1415700,16520720900)
上海市高等学校特聘教授(东方学者)项目
高等学校学科创新引智计划(111)(D20031)资助。
作者简介
张伟建(1994-),男,硕士,主要从事TDLAS技术检测气体方面的研究。E-mail:shdxzwj@shu.edu.cn;通信作者:曾祥龙(1977-),男,博士,教授,主要从事非线性超快光学、特种光纤及其传感技术的研究。E-mail:zenglong@shu.edu.cn。
