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免标定波长调制吸收光谱技术用于乙炔探测的研究

Calibration-Free Wavelength Modulation Absorption Spectroscopy for Acetylene Detection

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摘要

利用近红外可调谐半导体激光器结合自主设计的柱面镜光学多通池,采用免标定波长调制吸收光谱技术实现了乙炔气体的痕量探测;实验中,使用中心波长为1.53 μm的分布式反馈二极管激光器和有效光程为10.5 m的柱面镜光学多通池,采用免标定波长调制吸收光谱技术对乙炔气体进行探测,并利用Allan方差对系统性能进行分析;对免标定波长调制吸收光谱技术与传统波长调制吸收光谱技术进行对比分析。结果表明:相比于传统的波长调制技术,免标定波长调制吸收光谱技术具有系统结构简单、灵敏度高以及浓度和光功率免标定等特点,可以提高系统的探测灵敏度和测量精度;使用免标定波长调制吸收光谱技术时,系统的测量误差小于5%,测量精度是传统波长调制技术的3.5倍,平均时间为1 s时的系统探测灵敏度为0.127×10-6,平均时间为118 s时的系统探测灵敏度可达0.031×10-6。

Abstract

Calibration-free trace detection of acetylene gas is achieved by near infrared tunable diode laser absorption spectroscopy combined with a self-designed cylindrical mirror multi-pass absorption cell. A distributed feedback diode laser emission at 1.53 μm and the cylindrical mirrors multi-pass absorption cell with an effective optical path length of 10.5 m is used. The calibration-free wavelength modulation absorption spectroscopy is used to detect the acetylene, and the Allan variance is used to analyze the system performance. This technology is compared with the traditional wavelength modulation spectroscopy. The results show that compared with traditional wavelength modulation absorption spectroscopy, calibration-free wavelength modulation absorption spectroscopy has advantages of simple structure, high sensitivity, and calibration-free of concentration and optical power, which improve detection sensitivity and measurement accuracy of the system. The measurement error of the technology is less than 5%, and it is 3.5 times that of traditional wavelength modulation technology. The detection sensitivity of the system is 0.127×10-6 with average time of 1 s, and the detection sensitivity is 0.031×10-6 with average time of 118 s.

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中图分类号:O433.1

DOI:10.3788/aos201838.0930001

所属栏目:光谱学

基金项目:国家重点研发计划(2017YFC0209700,2016YFC0303900)、国家自然科学基金(41730103,41575030)

收稿日期:2018-03-15

修改稿日期:2018-04-08

网络出版日期:2018-04-13

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陈家金:中国科学院合肥物质科学研究院安徽光学精密机械研究所, 安徽 合肥 230031中国科学技术大学, 安徽 合肥 230026
王贵师:中国科学院合肥物质科学研究院安徽光学精密机械研究所, 安徽 合肥 230031
刘锟:中国科学院合肥物质科学研究院安徽光学精密机械研究所, 安徽 合肥 230031
谈图:中国科学院合肥物质科学研究院安徽光学精密机械研究所, 安徽 合肥 230031
高晓明:中国科学院合肥物质科学研究院安徽光学精密机械研究所, 安徽 合肥 230031中国科学技术大学, 安徽 合肥 230026

联系人作者:高晓明(xmgao@aiofm.ac.cn); 王贵师(gswang@aiofm.ac.cn); 陈家金(chenjiajin64@163.com);

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引用该论文

Chen Jiajin,Wang Guishi,Liu Kun,Tan Tu,Gao Xiaoming. Calibration-Free Wavelength Modulation Absorption Spectroscopy for Acetylene Detection[J]. Acta Optica Sinica, 2018, 38(9): 0930001

陈家金,王贵师,刘锟,谈图,高晓明. 免标定波长调制吸收光谱技术用于乙炔探测的研究[J]. 光学学报, 2018, 38(9): 0930001

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