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基于可调谐半导体激光吸收光谱的小型化C2H2测量系统

Compact Acetylene Detecting System Based on Tunable Diode Laser Absorption Spectroscopy

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摘要

基于可调谐半导体激光吸收光谱技术, 研制了一套近红外波段的乙炔(C2H2)气体检测系统, 该装置采用波长调制-多光程吸收光谱技术, 提高了系统的检测灵敏度; 为了优化系统测量条件, 在压强范围为5.3~12.0 kPa和调制幅度为0.010~0.035 V条件下, 测量了体积分数为5×10-5的C2H2标准气体的光谱信号, 并测量了不同浓度的C2H2在总压强为10.7 kPa时的二次谐波信号; 为了进一步验证系统的稳定性, 采集60 s的光谱信号, 通过Allan方差分析获得了系统的最佳探测时间和探测极限。结果表明: 压强为10.7 kPa且调制幅度为0.030 V时的二次谐波信号强度最大; C2H2气体浓度与二次谐波幅值呈良好的线性关系, 并且C2H2体积分数为1×10-6~5×10-5时的测量误差较小, 小于±2%; 该实验系统的最佳探测时间为7.2 s, 探测极限为2.8×10-11; 该仪器采用基于嵌入式系统设计的激光器驱动和数字锁相放大器, 具有结构简单、体积小、便于集成等特点, 适用于工业现场和气体运输等方面。

Abstract

A detecting system of acetylene (C2H2) gas in near-infrared region is developed based on the tunable diode laser absorption spectroscopy. The wavelength modulation spectroscopy in combination of multi-pass absorption cell is used to improve detecting sensitivity of the system. To optimize detecting conditions of the system, spectral signals of standard C2H2 gas with volume fraction of 5×10-5 are detected under the conditions of pressure of 5.3-12.0 kPa and modulated amplitude of 0.010-0.035 V. The second harmonic signals of C2H2 with different concentrations are detected at the total pressure of 10.7 kPa. To verify stability of the system, spectral signals for 60 s are acquired, and the most suitable detection time as well as the minimum detection limit is obtained by the Allan variance analysis. The results show that the signal intensity of the second harmonic signals is the greatest at pressure of 10.7 kPa and modulation amplitude of 0.030 V. The volume fraction of C2H2 is with a good linear relationship with the amplitude of the second harmonic signals, and the detecting deviation is less than ±2% in the range of volume fraction from 1×10-6 to 5×10-5. The most suitable detection time of the experimental system is 7.2 s, and the minimum detection limit is 2.8×10-11. The instrument adopts a laser driver and a digital lock-in amplifier based on an embedded system, so the instrument has the characteristics of simple mechanical structure, small size, and easy integration with other systems. Therefore, the compact detecting system for C2H2 gas is suitable for industrial process and gas transmission.

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中图分类号:O433

DOI:10.3788/LOP55.033002

所属栏目:光谱学

基金项目:国家自然科学基金(11504256, U1610117, 61405168, 61675120)、山西省高等学校科技创新项目(2015166)、山西省高等学校创新人才支持计划、山西省回国留学人员科研资助项目(2016-096)、晋城市科技攻关计划(1201501004-22)、西南科技大学博士基金(13zx7123)、西南科技大学-中国工程物理研究院激光聚变研究中心极端条件物质特性实验室开放基金(12zxjk08)、西南科技大学-中国工程物理研究院激光聚变研究中心极端条件物质特性实验室平台基金(14tdjk01)

收稿日期:2017-08-01

修改稿日期:2017-09-08

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作者单位    点击查看

蒋利军:太原科技大学应用科学学院, 山西 太原 030024
邱选兵:太原科技大学应用科学学院, 山西 太原 030024
周庆红:西南科技大学-中国工程物理研究院激光聚变研究中心极端条件物质特性实验室, 四川 绵阳 621010西南科技大学理学院, 四川 绵阳 621010
邵李刚:太原科技大学应用科学学院, 山西 太原 030024
杨雯:太原科技大学应用科学学院, 山西 太原 030024
魏计林:太原科技大学应用科学学院, 山西 太原 030024
李传亮:太原科技大学应用科学学院, 山西 太原 030024
马维光:山西大学激光光谱研究所量子光学与光量子器件国家重点实验室, 山西 太原 030006

联系人作者:李传亮(clli@tyust.edu.cn)

备注:蒋利军(1993-), 男, 硕士研究生, 主要从事吸收光谱方面的研究。E-mail: 2277526629@qq.com

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引用该论文

Jiang Lijun,Qiu Xuanbing,Zhou Qinghong,Shao Ligang,Yang Wen,Wei Jilin,Li Chuanliang,Ma Weiguang. Compact Acetylene Detecting System Based on Tunable Diode Laser Absorption Spectroscopy[J]. Laser & Optoelectronics Progress, 2018, 55(3): 033002

蒋利军,邱选兵,周庆红,邵李刚,杨雯,魏计林,李传亮,马维光. 基于可调谐半导体激光吸收光谱的小型化C2H2测量系统[J]. 激光与光电子学进展, 2018, 55(3): 033002

被引情况

【1】李亚飞,刘志伟,张天羽,郑传涛,王一丁. 近红外激光二氧化碳传感系统的研制及应用. 光学学报, 2020, 40(5): 514003--1

【2】张雅琪,王飞,崔海滨. 基于固定波长法吸收光谱技术的CO2温度测量. 激光与光电子学进展, 2019, 56(19): 193001--1

【3】臧益鹏,许振宇,夏晖晖,黄安,何亚柏,阚瑞峰. 基于免标定波长调制技术的高温谱线参数测量方法. 中国激光, 2020, 47(10): 1011001--1

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