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基于无芯-多模-无芯光纤结构的硫化氢气体传感性质研究

Properties of Hydrogen Sulfide Gas Sensor Based on No-Core-Multimode-No-Core Fiber Structure

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摘要

硫化氢(H2S)是一种高刺激性气体,具有强烈的恶臭。同时它也是一种强烈的神经毒气,严重威胁人身安全,还会对环境造成严重污染, 对金属设备产生严重腐蚀[1-2]。2006年,韩志英等[3]选取接触硫化氢的作业工人,分析硫化氢对作业工人健康状况的影响。结果显示,长期接触低浓度H2S对作业人群的影响主要表现为上呼吸道损伤。因此,对低浓度H2S气体检测的研发显得极为重要,在检测手段中也有多种类型的光纤传感器被提出并被应用于气体测量[4-6]。

Abstract

We present a hydrogen sulfide (H2S) gas sensor based on a no-core-multimode-no-core (NMN) fiber structure. The sensor is fabricated by using two no-core fibers (NCF) which are spliced at both the ends of a multimode fiber (MMF), and the NMN structure is constructed. Different high-order modes can be excited when light travels from a single-mode fiber (SMF) to NCF. When light enters MMF, the high-order modes and fundamental mode transmit in the cladding and core of MMF, respectively, resulting in phase difference and mode interference. Simultaneously, the transmission characteristics of NCF and MMF having different lengths are optimized. The outside surface of NCF is coated with a thin titanium dioxide film by the dip-coating method; thus, a rapid response to H2S gas can be achieved when the film absorbs the gas. With an increase in the H2S concentration, the interference spectra denote a red shift. A sensitivity of 7.36 pm/10 -6 and good linear relation are obtained in the H2S volume fraction range of 0-3×10 -5. In addition, titanium dioxide exhibits good selectivity to H2S, and the response and recovery time of the sensor are approximately 50 s and 65 s. The sensor has advantages of simple structure, high sensitivity, and easy manufacturability, and it can be applied in the field of safety monitoring of the low-concentration H2S gas.

Newport宣传-MKS新实验室计划
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DOI:10.3788/AOS201939.1006007

所属栏目:光纤光学与光通信

基金项目:国家自然科学基金、重庆市高校创新团队项目、重庆市科技局社会事业与民生保障科技创新专项、重庆市科技创新领军人才项目;

收稿日期:2019-05-30

修改稿日期:2019-06-25

网络出版日期:2019-10-01

作者单位    点击查看

刘敏:重庆理工大学理学院, 重庆 400054
冯德玖:重庆理工大学理学院, 重庆 400054
冯文林:重庆理工大学理学院, 重庆 400054绿色能源材料技术与系统重庆市重点实验室, 重庆 400054

联系人作者:冯文林(wenlinfeng@126.com)

备注:国家自然科学基金、重庆市高校创新团队项目、重庆市科技局社会事业与民生保障科技创新专项、重庆市科技创新领军人才项目;

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引用该论文

Min Liu,Dejiu Feng,Wenlin Feng. Properties of Hydrogen Sulfide Gas Sensor Based on No-Core-Multimode-No-Core Fiber Structure[J]. Acta Optica Sinica, 2019, 39(10): 1006007

刘敏,冯德玖,冯文林. 基于无芯-多模-无芯光纤结构的硫化氢气体传感性质研究[J]. 光学学报, 2019, 39(10): 1006007

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