2μm波段高灵敏度离轴积分腔装置实际大气CO2测量

李志彬; 马宏亮; 曹振松; 孙明国; 黄印博; 朱文越; 刘强

doi:10.7498/aps.65.053301

摘要

利用分布反馈式(DFB)二极管激光器为光源, 搭建了一套2 μm波段的离轴积分腔输出光谱装置. 利用高纯甲烷气体, 测量了腔镜反射率随腔内气体压力变化的规律. 当腔内压力为3.59 kPa 时, 标定的镜面反射率为0.99865, 在此条件下, 基长55 cm 的离轴积分腔实现了407.4 m的吸收光程. 选取CO2 在4993.7431 cm-1处的吸收谱线对实际大气中的CO2浓度进行了测量, 探测限为0.53 ppmv (1σ), 利用小波去噪对光谱信号进行了去噪处理, 信噪比提高了80%, 探测限提高到0.29 ppmv(1σ). 利用搭建的装置在实验室内测量了从上午9时到中午12时实际大气中CO2的浓度, 并与H2O/CO2分析仪进行了同时观测与对比分析, 初步验证了测量装置的可靠性.

关键词:

离轴积分腔 /
CO2 /
小波去噪

Abstract

An off-axis integrated cavity output spectroscopy (OA-ICOS) is established by using a fiber-coupled distributed feedback diode laser operating near 2 μm. Its performances are evaluated and optimized through experimental investigation via detecting the pure CH4 absorptions at different pressures. The reflectivity of the cavity mirror is measured to be 0.99865, which results in the effective total optical pathlength of up to 407.4 m based on a 55 cm cavity. It is shown that the OA-ICOS configuration can be used to obtain very long optical pathlength, leading to pretty high sensitive monitoring of atmospheric trace gases. Based on the developed OA-ICOS, the atmospheric CO2 measurements are made and its performance is improved by using the wavelet denoising approach. The CO2 absorption line at 4993.7431 cm-1 is used for measuring the concentration. The measured results are compared with the results obtaind by a commercial H2O/CO2 analyzer. Agreement and disagreement are briefly discussed, and the results show that the OA-ICOS is reliable for detecting the atmospheric trace gases. The limitation of the developed OA-ICOS and the further steps towards the improvement in precision and accuracy are also presented.

Keywords:

作者及机构信息

1.
中国科学院安徽光学精密机械研究所, 大气成分与光学重点实验室, 合肥 230031;

2.
中国科学院大学, 北京 100049

通信作者: 曹振松, zscao@aiofm.ac.cn

基金项目: 国家自然科学基金青年科学基金(批准号: 41205021) 资助的课题.

Authors and contacts

1.
Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 220031, China;

2.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: Cao Zhen-Song, zscao@aiofm.ac.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 41205021)

参考文献

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[16]	Tan Z Q, Long X W 2010 Opt. Commun 283 1406
[17]	Fiedler S E, Hese A, Ruth A A 2003 Chem. Phys. Lett. 371 284
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施引文献

[1]	Paul J B, Lapson L An derson J G 2001 Appl. Opt. 40 4904
[2]	Arévalo-Martínez D L, Beyer M, Krumbholz M, Piller I, Kock A, Steinhoff T, Körtzinger A, Bange H W 2013 Ocean Sci. 9 1071
[3]	Glzow W, Rehder G, Schneider B, Deimling J S V, Sadkowiak B 2011 Limnol. Oceanogr. Meth. 9 176
[4]	Arslanov D D, Cristescu S M, Harren F J M 2010 Opt. Lett. 35 3300
[5]	Berman E S F, Fortson S L, Snaith S P, Gupta M, Baer D S, Chery I, Blanc S, Melanson E L, Thomson P J, Speakman J R 2012 Anal. Chem. 84 9768
[6]	Lee L, Park H, Kim T S, Ko K H, Jeong D Y 2012 Nucl. Instrum. Meth. A 678 8
[7]	Duan J, Qin M, Fang W, Ling L Y, Hu R Z, Lu X, Shen L L,Wang D, Xie P H, Liu J G, Liu W Q 2015 Acta Phys. Sin. 64 180701 (in Chinese) [段俊, 秦敏, 方武, 凌六一, 胡仁志, 卢雪, 沈兰兰, 王丹, 谢品华, 刘建国, 刘文清 2015 64 180701]
[8]	Ling L Y, Xie P H, Lin P P, Huang Y R, Qin M, Duan J, Hu R Z, Wu F C 2015 Acta Phys. Sin. 64 130705 (in Chinese) [凌六一, 谢品华, 林攀攀, 黄友锐, 秦敏, 段俊, 胡仁志, 吴丰成 2015 64 130705]
[9]	Pei S X, Gao X M, Cui F P, Huang W, Shao J, Fan H, Zhang W J 2005 Spectrosc Spect. Anal. 25 1908 (in Chinese) [裴世鑫, 高晓明, 崔芬萍, 黄伟, 邵杰, 樊宏, 张为俊 2005 光谱学与光谱分析 25 1908]
[10]	Zhao W X, Gao X M Zhang W J, Huang T 2006 Acta Optica Sin. 26 1260 (in Chinese) [赵卫雄, 高晓明, 张为俊, 黄腾 2006 光学学报 26 1260]
[11]	Jia H Guo X Y Cai T D, Zhao W X, Wang L, Tan T, Zhang W J, Gao X M 2009 Spectrosc Spect. Anal. 29 3173 (in Chinese) [贾慧, 郭晓勇, 蔡廷栋, 赵卫雄, 汪磊, 谈图, 张为俊, 高晓明 2009 光谱学与光谱分析 29 3173]
[12]	Dong M L, Zhao W X, Cheng Y, Hu C J, Gu X J, Zhang W J 2012 Acta Phys. Sin. 61 060702 (in Chinese) [董美丽, 赵卫雄, 程越, 胡长进, 顾学军, 张为俊 2012 61 060702]
[13]	Dong Y, Wang G L, Wang H P, Ni H Q, Chen J H, Gao F Q, Qiao Z T 2014 Chin. Phys. B 23 104209
[14]	Wu Z W, Dong Y T, Zhou W D 2014 Spectrosc Spect. Anal. 34 2081 (in Chinese) [吴志伟, 董燕婷, 周卫东 2014 光谱学与光谱分析 34 2081]
[15]	Chen X, Sui Q M, Miao F, Jia L, Cao Y Q 2012 Opt. Precision Eng. 20 9 (in Chinese) [陈霄, 隋青美, 苗飞, 贾磊, 曹玉强 2012 光学精密工程 20 9]
[16]	Tan Z Q, Long X W 2010 Opt. Commun 283 1406
[17]	Fiedler S E, Hese A, Ruth A A 2003 Chem. Phys. Lett. 371 284
[18]	Bakhirkin Y A, Kosterev A A, Curl R F, Tittel F K, Yarekha D A, Hvozdara L, Giovannini M, Faist J 2006 Appl. Phys. B 82 149
[19]	Wang L, Song G X 1999 J. Xidian Univ. 26 358 (in Chinese) [王玲, 宋国乡 1999 西安电子科技大学学报 26 358]

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