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The research of delta(CO2)-C-13 by use of wavelet de-noising at 2.008 mu m based on tunable diode laser absorption spectroscopy

文献类型：期刊论文

作者Niu Ming-Sheng1,2; Wang Gui-Shi2
刊名ACTA PHYSICA SINICA
出版日期2017-01-20
卷号66期号:2页码:1-9
关键词Isotope Measurement Novel Multi-pass Cell Wavelet Denoising Measurement Precise
DOI10.7498/aps.66.024202
文献子类Article
英文摘要Development of optical isotope techniques has provided scientists with a set of powerful tools for investigating the sources and sink of atmospheric CO2. Here we describe a continuous, high precision, compact and portable carbon dioxide isotope ratio laser multi-pass cell spectrometer with a tunable distribute feedback laser at 2.008 mu m based on tunable diode laser absorption spectroscopy and, the spectrometer has good temperature and pressure stability. In order to deduce the noise, drift effect and background changes associated with low level signals, a superior signal processing technique of wavelet denoising, which possesses multi-level analytical resolutions both in time and frequency-domains, is introduced. After evaluating the method, evaluation ability and applicabilities of several common wavelet functions are analyzed and tested, the wavelet function of Haar is selected as an optimal wavelet basis function. Based on the analysis of the optimal decomposition level of Haa wavelet function, the VISU function is selected as an optimal wavelet threshold function. The denoising effect and measurement precision are evaluated by use of the VISU threshold function in the measurement process of carbon dioxide stable isotope ratio. The measurement results of carbon dioxide stable isotope ratio before and after suppressing the noises are compared in the same experiment conditions and, the inconsistent reasons of the measured results are theoretically analyzed. This technique allows the measurement of the delta-value for carbon dioxide isotopic ratios with a precision of -12.5% and the measuremnt results show that the wavelet denoising measuring results have higher measurement accuracy, and the measurement precise of carbon dioxide isotope ratio is 7.3 times the original measurement results. The application of the wavelet denoising to the carbon dioxide isotope ratio measurement for the first time proves that the capability of the new near-infrared direct absorption technique to measure isotope ratio can permit high-frequency, near-continuous isotope measurement and obtain the high precision and accurate real-time stable isotope data directly in the field. This technique provides an important tool for studying the resource and sink of green house gases in the future.
WOS关键词ATMOSPHERIC CO2 ; CARBON-DIOXIDE ; ISOTOPE ; METHANE ; CHINA ; RATIO ; WATER ; SPECTROMETRY ; PERFORMANCE
WOS研究方向Physics
语种英语
WOS记录号WOS:000397107800012
资助机构National Natural Science Foundation of China(41405022) ; National Natural Science Foundation of China(41405022) ; National Natural Science Foundation of China(41405022) ; National Natural Science Foundation of China(41405022) ; National Natural Science Foundation of China(41405022) ; National Natural Science Foundation of China(41405022) ; National Natural Science Foundation of China(41405022) ; National Natural Science Foundation of China(41405022) ; Qufu Normal University Fundation, China(20130760) ; Qufu Normal University Fundation, China(20130760) ; Qufu Normal University Fundation, China(20130760) ; Qufu Normal University Fundation, China(20130760) ; Qufu Normal University Fundation, China(20130760) ; Qufu Normal University Fundation, China(20130760) ; Qufu Normal University Fundation, China(20130760) ; Qufu Normal University Fundation, China(20130760) ; National Natural Science Foundation of China(41405022) ; National Natural Science Foundation of China(41405022) ; National Natural Science Foundation of China(41405022) ; National Natural Science Foundation of China(41405022) ; National Natural Science Foundation of China(41405022) ; National Natural Science Foundation of China(41405022) ; National Natural Science Foundation of China(41405022) ; National Natural Science Foundation of China(41405022) ; Qufu Normal University Fundation, China(20130760) ; Qufu Normal University Fundation, China(20130760) ; Qufu Normal University Fundation, China(20130760) ; Qufu Normal University Fundation, China(20130760) ; Qufu Normal University Fundation, China(20130760) ; Qufu Normal University Fundation, China(20130760) ; Qufu Normal University Fundation, China(20130760) ; Qufu Normal University Fundation, China(20130760)
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/31739]  
专题合肥物质科学研究院_中科院安徽光学精密机械研究所
作者单位1.Qufu Normal Univ, Shandong Prov Key Lab Laser Polarizat & Informat, Laser Inst, Qufu 273165, Peoples R China
2.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Lab Atmospher Physicochem, Hefei 230031, Peoples R China
推荐引用方式
GB/T 7714		 Niu Ming-Sheng,Wang Gui-Shi. The research of delta(CO2)-C-13 by use of wavelet de-noising at 2.008 mu m based on tunable diode laser absorption spectroscopy[J]. ACTA PHYSICA SINICA,2017,66(2):1-9.
APA Niu Ming-Sheng,&Wang Gui-Shi.(2017).The research of delta(CO2)-C-13 by use of wavelet de-noising at 2.008 mu m based on tunable diode laser absorption spectroscopy.ACTA PHYSICA SINICA,66(2),1-9.
MLA Niu Ming-Sheng,et al."The research of delta(CO2)-C-13 by use of wavelet de-noising at 2.008 mu m based on tunable diode laser absorption spectroscopy".ACTA PHYSICA SINICA 66.2(2017):1-9.

入库方式： OAI收割

来源：合肥物质科学研究院

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