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Measurements of Nighttime Nitrate Radical Concentrations in the Atmosphere by Long-Path Differential Optical Absorption Spectroscopy 被引量:8
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作者 李素文 刘文清 +3 位作者 谢品华 李昂 秦敏 窦科 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2007年第5期875-880,共6页
The long-path differential optical absorption spectroscopy (LP-DOAS) technique was developed to mea- sure nighttime atmospheric nitrate radical (NO3) concentrations. An optimized retrieval method, resulting in a s... The long-path differential optical absorption spectroscopy (LP-DOAS) technique was developed to mea- sure nighttime atmospheric nitrate radical (NO3) concentrations. An optimized retrieval method, resulting in a small residual structure and low detection limits, was developed to retrieve NO3. The time series of the NO3 concentration were collected from 17 to 24 March, 2006, where a nighttime average value of 15.8 ppt was observed. The interfering factors and errors are also discussed. These results indicate that the DOAS technique provides an essential tool for the quantification of NO3 concentration and in the study of its effects upon nighttime chemistry. 展开更多
关键词 nitrate radical long-path differential optical absorption spectroscopy detection limits ERRORS
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Novel infrared differential optical absorption spectroscopy remote sensing system to measure carbon dioxide emission 被引量:1
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作者 Ru-Wen Wang Pin-Hua Xie +1 位作者 Jin Xu Ang Li 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第1期353-359,共7页
A CO_2 infrared remote sensing system based on the algorithm of weighting function modified differential optical absorption spectroscopy(WFM-DOAS) is developed for measuring CO_2 emissions from pollution sources. The ... A CO_2 infrared remote sensing system based on the algorithm of weighting function modified differential optical absorption spectroscopy(WFM-DOAS) is developed for measuring CO_2 emissions from pollution sources. The system is composed of a spectrometer with band from 900 nm to 1700 nm, a telescope with a field of view of 1.12?, a silica optical fiber, an automatic position adjuster, and the data acquisition and processing module. The performance is discussed,including the electronic noise of the charge-coupled device(CCD), the spectral shift, and detection limits. The resolution of the spectrometer is 0.4 nm, the detection limit is 8.5 × 10^(20)molecules·cm^(-2), and the relative retrieval error is < 1.5%.On May 26, 2018, a field experiment was performed to measure CO_2 emissions from the Feng-tai power plant, and a twodimensional distribution of CO_2 from the plume was obtained. The retrieved differential slant column densities(dSCDs)of CO_2 are around 2 × 10^(21) molecules·cm^(-2) in the unpolluted areas, 5.5 × 10^(21)molecules·cm^(-2) in the plume locations most strongly affected by local CO_2 emissions, and the fitting error is less than 2 × 10^(20)molecules·cm^(-2), which proves that the infrared remote sensing system has the characteristics of fast response and high precision, suitable for measuring CO_2 emission from the sources. 展开更多
关键词 weighting function modified differential optical absorption spectroscopy(WFM-DOAS) INFRARED instrument CO2 emission SOURCES
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Simultaneous Monitoring of Nitrogen Dioxide and Aerosol Concentrations with Dual Path Differential Optical Absorption Spectroscopy 被引量:1
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作者 Hayato Saito Yutaro Goto +9 位作者 Yusaku Mabuchi Ilham Alimuddin Gerry Bagtasa Naohiro Manago Hitoshi Irie Ippei Harada Toshihiko Ishibashi Kazunori Yashiro Shumpei Kameyama Hiroaki Kuze 《Open Journal of Air Pollution》 2014年第1期20-32,共13页
Differential optical absorption spectroscopy (DOAS) is a useful technique for measuring nitrogen dioxide (NO2) and aerosol, the most important species in urban environmental pollution. This paper reports on the result... Differential optical absorption spectroscopy (DOAS) is a useful technique for measuring nitrogen dioxide (NO2) and aerosol, the most important species in urban environmental pollution. This paper reports on the results of our dual path DOAS measurements recently conducted in Chiba City, Japan, using xenon flashlights equipped on tall constructions as aviation obstruction lights. Because of the proximity of the southern DOAS path to an industrial area, it is found that the level of air pollution generally increases with the dominance of westerly winds, from the plausible source area to the observation light path. This situation is consistent with the result of wind lidar measurement covering a sector of ±28? with the observation range of approximately 2.8 km. In spite of the fact that the two DOAS paths, having path lengths of 5.5 and 3.5 km each, are located in separated regions of Chiba City, the observed temporal behavior was similar for both nitrogen dioxide and aerosol, though the southern path tends to exhibit slightly higher pollution levels than the northern counterpart. Additionally it is confirmed that size information of aerosol particles can be derived from the DOAS data through the analysis of the wavelength dependence of the aerosol optical thickness, which shows fairly good correlation with the mass ratio between PM2.5 and suspended particulate matter (SPM) obtained from the in-situ sampling station measurement. Thus, the DOAS approach can also be utilized for obtaining information on PM2.5 that is considered to be more harmful to human health than SPM. 展开更多
关键词 differential optical absorption spectroscopy (DOAS) WIND Lidar Urban Air POLLUTION Nitrogen Dioxide AEROSOL PM2.5 SPM
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Measurements of NO_2 mixing ratios with topographic target light scattering-differential optical absorption spectroscopy system and comparisons to point monitoring technique
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作者 王杨 李昂 +6 位作者 谢品华 曾议 王瑞斌 陈浩 裴显 刘建国 刘文清 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第11期285-290,共6页
A topographic target light scattering-differential optical absorption spectroscopy ('IbTaL-DOA~) system is de- veloped for measuring average concentrations along a known optical path and studying surface-near distr... A topographic target light scattering-differential optical absorption spectroscopy ('IbTaL-DOA~) system is de- veloped for measuring average concentrations along a known optical path and studying surface-near distributions of atmospheric trace gases. The telescope of the ToTaL-DOAS system points to targets which are located at known dis- tances from the measurement device and illuminated by sunlight. Average concentrations with high spatial resolution can be retrieved by receiving sunlight reflected from the targets, A filed measurement of NO2 concentration is performed with the ToTaL-DOAS system in Shijiazhuang in the autumn of 2011. The measurement data are compared with con- centrations measured by the point monitoring technique at the same site. The results show that the ToTaL-DOAS system is sensitive to the variation of NO2 concentrations along the optical path. 展开更多
关键词 atmospheric optics target light scattering-differential optical absorption spectroscopy(ToTaL-DOAS) atmospheric trace gas averaging mixing ratio
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Observation of tropospheric NO_2 by airborne multi-axis differential optical absorption spectroscopy in the Pearl River Delta region,south China
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作者 徐晋 谢品华 +7 位作者 司福祺 李昂 吴丰成 王杨 刘建国 刘文清 Andreas Hartl Chan Ka Lok 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第9期247-251,共5页
An airborne multi-axis differential optical absorption spectroscopic (AMAX-DOAS) instrument was developed and applied to measure tropospheric NO2 in the Pearl River Delta region in the south of China. By combining t... An airborne multi-axis differential optical absorption spectroscopic (AMAX-DOAS) instrument was developed and applied to measure tropospheric NO2 in the Pearl River Delta region in the south of China. By combining the measurements in nadir and zenith directions and analyzing the UV and visible spectral region using the DOAS method, information about tropospheric NO2 vertical columns was obtained. Strong tropospheric NO2 signals were detected when flying over heavilly polluted regions and point sources like plants. The AMAX-DOAS results were compared with ground-based MAX-DOAS observations in the southwest of Zhuhai city using the same parameters for radiative transport calculations. The difference in vertical column data between the two instruments is about 8%. Our data were also compared with those from OMI and fair agreement was obtained with a correlation coefficient R of 0.61. The difference between the two instruments can be attributed to the different spatial resolution and the temporal mismatch during the measurements. 展开更多
关键词 air pollution tropospheric NO2 airborne multi-axis differential optical absorption spectroscopy vertical column
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Intercomparison of NO_x, SO_2, O_3, and Aromatic Hydrocarbons Measured by a Commercial DOAS System and Traditional Point Monitoring Techniques 被引量:19
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作者 谢品华 刘文清 +3 位作者 付强 王瑞斌 刘建国 魏庆农 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2004年第2期211-219,共9页
A field-based Intercomparison study of a commercial Differential Optical Absorption Spectroscopy (DOAS) instrument (OPSIS AB, Sweden) and different point-sample monitoring techniques (PM, based on an air monitoring st... A field-based Intercomparison study of a commercial Differential Optical Absorption Spectroscopy (DOAS) instrument (OPSIS AB, Sweden) and different point-sample monitoring techniques (PM, based on an air monitoring station, an air monitoring vehicle, and various chemical methods) was conducted in Beijing from October 1999 to January 2000. The mixing ratios of six trace gases including NO, NO2, SO2, O3, benzene, and toluene were monitored continuously during the four months. A good agreement between the DOAS and PM data was found for NO2 and SO2. However, the concentrations of benzene, toluene, and NO obtained by DOAS were significantly lower than those measured by the point monitors. The ozone levels monitored by the DOAS were generally higher than those measured by point monitors. These results may be attributed to a strong vertical gradient of the NO-O3-NO2 system and of the aromatics at the measurement site. Since the exact data evaluation algorithm is not revealed by the manufacturer of the DOAS system, the error in the DOAS analysis can also not be excluded. 展开更多
关键词 differential optical absorption spectroscopy urban air pollution intercomparison remote-sensing technique
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Effect of Water Vapor Absorption on Measurements of Atmospheric Nitrate Radical by LP-DOAS 被引量:3
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作者 Su-wen Li Wen-qing Liu +3 位作者 Pin-hua Xie Yi-jun Yang De-bao Chen Zheng Li 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 北大核心 2008年第5期433-437,共5页
During the measurement of atmospheric nitrate radical by long-path differential optical absorption spectroscopy, water vapor strong absorption could affect the measurement of nitrate radical and detection limits of sy... During the measurement of atmospheric nitrate radical by long-path differential optical absorption spectroscopy, water vapor strong absorption could affect the measurement of nitrate radical and detection limits of system. Under the tropospheric condition, the optical density of water vapor absorption is non-linearly dependent on column density. An effective method was developed to eliminate the effect of water vapor absorption. Reference spectra of water vapor based on the daytime atmospheric absorption spectra, when fitted together with change of cross section with water vapor column densities, gave a more accurate fitting of water vapor absorptions, thus its effect on the measurements of nitrate radical could be restricted to a minimum and detection limits of system reached 3.6 ppt. The modified method was applied during an intensive field campaign in the Pearl River Delta, China. The NO3 concentration in polluted air masses varied from 3.6 ppt to 82.5 ppt with an average level of 23.6±1.8 ppt. 展开更多
关键词 Nitrate radical Water vapor absorption long-path differential optical absorption spectroscopy Detection limit
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Effect of Atmospheric Interfering Absorption on Measurement of BTX by DOAS 被引量:1
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作者 Fu-min Peng Pin-hua Xie +3 位作者 Hai-yang Li Ying-hua Zhang Jun-de Wang Wen-qing Liu 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 北大核心 2008年第3期202-210,共9页
It was reported on the elimination of interfering absorption of BTX. the absorption of O2 includes different absorption bands, which change differently when the partial pressure of oxygen is varied. These cause the no... It was reported on the elimination of interfering absorption of BTX. the absorption of O2 includes different absorption bands, which change differently when the partial pressure of oxygen is varied. These cause the nonlinear absorption of O2 and the observed band shape to vary with the column density of O2. The absorption ratios of molecular absorption in each of the Herzberg bands and dimer absorptions, as well as the contribution to the correction error of molecular absorption, are studied based on the characteristic of these absorption bands. The optimized way to eliminate the interfering absorption is obtained in the end and the effectiveness of using interpolation proposed by Volkamer et al. to remove O2 absorption is proved again. As to O2 and SO2, the effect of the thermal effect of characteristic spectra on the elimination error of their absorption is studied. Solutions to these problems are discussed and demonstrated together with methods to optimize the interpolation of spectra. As a sample application, differential optical absorption spectroscopy (DOAS) measurements of BTX are carried out. Results show a low detection limit and the good correlation with point instruments are achieved. All these prove the feasibility of using spectral interpolation to improve the accuracy of DOAS measurements of aromatic hydrocarbons for practical purposes. 展开更多
关键词 differential optical absorption spectroscopy BTX Herzberg band O2 dimer
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基于MAX-DOAS观测的鹤山地区对流层甲醛廓线反演研究
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作者 钱园园 罗宇涵 +7 位作者 周海金 窦科 常振 杨太平 奚亮 汤付颖 徐自强 司福祺 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2024年第6期1781-1788,共8页
甲醛(HCHO)是大气中一种十分重要的痕量气体,它不仅与人类健康和环境密切相关,还在对流层光化学反应中扮演着极其重要的角色。近年来,我国珠三角地区的秋季对流层臭氧及甲醛污染问题较为严重,而对流层甲醛也是分析边界层臭氧形成机理的... 甲醛(HCHO)是大气中一种十分重要的痕量气体,它不仅与人类健康和环境密切相关,还在对流层光化学反应中扮演着极其重要的角色。近年来,我国珠三角地区的秋季对流层臭氧及甲醛污染问题较为严重,而对流层甲醛也是分析边界层臭氧形成机理的关键性指标之一,因此,在珠三角地区开展甲醛观测实验具有十分重要的意义。利用多轴差分吸收光谱技术(MAX-DOAS)反演了鹤山超级站2019年9月20日至10月3日期间的氧气二聚体(O_(4))与HCHO的差分斜柱浓度(DSCD),使用几何近似法得到了甲醛的大气质量因子(AMF),进而获得了对流层甲醛的垂直柱浓度(VCD)。结果显示,观测期间的对流层甲醛VCD在4.99×10^(13)~6.48×10^(16)molec·cm^(-2)之间波动,平均值为2.18×10^(16)molec·cm^(-2)。将MAX-DOAS反演的对流层甲醛VCD与TROPOMI结果进行了对比,结果表明,MAX-DOAS与TROPOMI结果近乎一致,相关性系数R为0.80,但9月25日与28日的TROPOMI结果偏低了约25%,这可能是由于观测方式不同所导致的。此外,该研究还基于反演的O_(4)与甲醛DSCD,使用基于最优估计算法的海德堡大学廓线反演算法(HEIPRO)反演了观测期间的对流层气溶胶及甲醛廓线,结果表明,甲醛污染主要集中在近地面0~800 m内,观测期间的甲醛污染主要来源于当地的工业及机动车尾气排放。将MAX-DOAS技术反演的近地面甲醛结果与2,4-二硝基苯肼色谱技术测量结果进行了对比,结果表明,两种技术的近地面甲醛结果的一致性较高,均观测到了9月27至29日的近地面甲醛高值(峰值达到了14.31μg·m^(-3)),且相关性系数R为0.88,斜率为0.98,验证了MAX-DOAS技术反演的近地面甲醛结果的可靠性。MAX-DOAS技术可实现对流层甲醛VCD的实时监测,可作为验证星载观测结果的一种重要手段,结合最优估计算法,MAX-DOAS技术还可以实现对流层甲醛廓线的反演。 展开更多
关键词 多轴差分吸收光谱技术 对流层甲醛 最优估计算法 鹤山 卫星校验
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多通池内光程实时校正技术用于甲烷浓度测量的方法研究
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作者 季益敏 谈图 +2 位作者 高晓明 刘锟 王贵师 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2024年第11期3029-3036,共8页
甲烷(CH4)是目前重要的清洁能源之一——天然气的主要成分,然而其具有易燃易爆的特性,因此监测大气和重要场所的CH4浓度有重要意义。激光吸收光谱技术由于其灵敏度高、检测速度快、选择性好和免接触等优势,在气体测量等领域获得广泛应... 甲烷(CH4)是目前重要的清洁能源之一——天然气的主要成分,然而其具有易燃易爆的特性,因此监测大气和重要场所的CH4浓度有重要意义。激光吸收光谱技术由于其灵敏度高、检测速度快、选择性好和免接触等优势,在气体测量等领域获得广泛应用。为了获得更高的测量精度,通常使用光学多通池(MPCs)增加吸收光程(OPL)。对吸收光程的实时准确标定具有重要意义,得到光程的准确值结合其他参数等可通过朗伯-比尔(Lambert-Beer)定律直接反演出待测气体浓度而避免传统方法中标准气体定标这一复杂步骤。由于前人采用调频连续波(FMCW)和光学频域反射计(OFDR)法等具有结构较为复杂和运算量大等缺陷,提出了一种基于调幅连续波(AMCW)技术的多通池内光程测量方法,具有结构简单和测量速度快等优势,并将其与激光吸收光谱技术结合实现光程和CH4吸收谱的同时测量。主要通过光纤合束器将测光程的中心波长为650 nm的激光和测吸收谱的中心波长为1654 nm的分布式反馈(DFB)激光器发出的激光同时耦合进物理基长为12 cm的多通池内,在出射端分别测量测光程激光振幅调制的相位和测吸收谱激光的光强以同时获得光程和吸收谱信息。测量使用体积分数为297×10-6的CH4标准气体和CH4在6057.1 cm-1附近的吸收谱线。首先对实验所使用的DFB激光器进行工作电流与输出波数的标定,可将吸收谱的横坐标从点数变换为波数。然后调节光线耦合进多通池的入射角度,测量了4组不同光程与吸收谱数据,多通池内光程和吸收峰值分别为1.606 m和0.0212、3.326 m和0.0445、5.050 m和0.0678与6.762 m和0.0899。将所测光程与通过反射次数估算的光程进行线性拟合,相关系数r≈1;将所测光程与吸收峰值进行线性拟合,两者具有良好的线性关系,r≈0.99987。以上数据验证了AMCW技术用于多通池内光程实时测量的可行性与准确性,为激光吸收光谱技术中光程的确定和浓度的测量提供了一种新方法和思路。 展开更多
关键词 甲烷 激光吸收光谱技术 调幅连续波 光程 红外光谱 线性拟合
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差分吸收光谱技术中吸收截面的测量 被引量:15
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作者 吴桢 虞启琏 +1 位作者 张帆 姚建铨 《仪器仪表学报》 EI CAS CSCD 北大核心 2004年第4期470-472,共3页
描述了影响差分吸收光谱技术 (DOAS)精度的主要因素——吸收截面的测量原理以及自己设计的测量装置 ,并用此装置测量了 SO2 、NO2 和 O3的吸收截面。根据测量结果分析了应用
关键词 术中 测量结果分析 影响 NO2 并用 描述 装置 差分吸收光谱 SO2 DOAS
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差分光学吸收光谱(DOAS)技术在烟气SO_2监测中的应用 被引量:49
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作者 谢品华 刘文清 +3 位作者 郑朝晖 魏庆农 王亚萍 刘建国 《光子学报》 EI CAS CSCD 2000年第3期271-271,共1页
本文将差分光学吸收光谱 (Differential Optical Absorption Spectroscopy,DOAS)技术中的浓度反演方法运用到烟气 SO2 监测中 .利用 SO2 分子在 3 0 0 nm附近具有强吸收的特性 ,测量出烟气 SO2 的吸收光谱 ,用 DOAS方法反演出 SO2 分子... 本文将差分光学吸收光谱 (Differential Optical Absorption Spectroscopy,DOAS)技术中的浓度反演方法运用到烟气 SO2 监测中 .利用 SO2 分子在 3 0 0 nm附近具有强吸收的特性 ,测量出烟气 SO2 的吸收光谱 ,用 DOAS方法反演出 SO2 分子的浓度 ,消除了烟气中烟尘、水汽和其它成分的影响 ,使在线实时测量成为可能 ,在实验室内对几种 SO2 分子浓度样气进行了测量和浓度反演 . 展开更多
关键词 差分光学吸收光谱 监测 大气 烟气 二氧化硫
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基于二极管阵列PDA的紫外可见差分吸收光谱(DOAS)系统的研究 被引量:38
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作者 秦敏 谢品华 +8 位作者 刘建国 刘文清 方武 陆钒 李昂 陆亦怀 魏庆农 窦科 张为俊 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2005年第9期1463-1467,共5页
介绍了一种自行研制的长程差分光学吸收光谱(DOAS)系统,该系统采用光电二极管阵列(PDA)作为光谱检测器,代替结构较为复杂的光电倍增管(PMT)加扫描圆盘的SD检测器,并对该系统检测器的偏置、暗电流、噪声、线性以及光谱仪的分辨率、光谱... 介绍了一种自行研制的长程差分光学吸收光谱(DOAS)系统,该系统采用光电二极管阵列(PDA)作为光谱检测器,代替结构较为复杂的光电倍增管(PMT)加扫描圆盘的SD检测器,并对该系统检测器的偏置、暗电流、噪声、线性以及光谱仪的分辨率、光谱范围等性能进行了测试,同时对SO2,NO2等大气污染物进行了外场的测定,确定出相应光程下该系统测量SO2,NO2的最低检测限。 展开更多
关键词 光电二极管阵列(PDA) 差分光学吸收光谱(DOAS) 系统
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被动差分吸收光谱法测量区域内污染气体排放通量的方法研究 被引量:19
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作者 李昂 谢品华 +2 位作者 刘文清 刘建国 窦科 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2009年第1期28-32,共5页
研究了一种基于被动差分吸收光谱技术(differential optical absorption spectroscopy,DOAS)测量区域(如工业区,城市)内SO2等大气污染气体排放通量的光学遥测方法。采用安装在汽车上的被动DOAS系统围绕区域进行扫描测量,通过被动DOAS光... 研究了一种基于被动差分吸收光谱技术(differential optical absorption spectroscopy,DOAS)测量区域(如工业区,城市)内SO2等大气污染气体排放通量的光学遥测方法。采用安装在汽车上的被动DOAS系统围绕区域进行扫描测量,通过被动DOAS光谱处理方法对系统采集的天顶太阳散射光谱进行处理获取污染气体柱密度,再结合测量时段的气象(风场)信息获得该区域内污染气体对外的净排放通量。文章着重描述了获得污染气体柱密度的差分吸收光谱方法以及区域内污染气体净排放通量的计算方法,并构建了车载被动DOAS系统对北京市五环路以内区域的SO2和NO2排放进行外场测量,测得了该区域内SO2和NO2净排放通量分别为1.13×104和9.3×103kg.h-1。实验结果表明这种基于被动DOAS的光学遥测方法能够用于区域内污染气体排放通量的快速测量。 展开更多
关键词 被动差分吸收光谱法 污染源 排放通量
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差分吸收光谱法监测NO_2浓度技术研究 被引量:14
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作者 蔡小舒 李树荣 +1 位作者 付敬业 赵志军 《工程热物理学报》 EI CAS CSCD 北大核心 2003年第2期351-353,共3页
差分吸收光谱(DOAS)是利用气体分子对光谱具有特殊吸收这一特性来测量气体浓度的一种测量技术.本文介绍了DOAS法的基本测量原理,分析了DOAS的数据处理方法,并用DOAS法进行了不同情况时NO2气体浓度测量的实验研究。
关键词 差分吸收光谱法 二氧化氮 排放 在线监测 大气污染 气体浓度
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Temperature Dependence of Atmospheric NO3 Loss Frequency 被引量:3
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作者 李素文 谢晶华 +2 位作者 陈得宝 姜恩华 汪徐德 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2011年第2期145-149,I0003,共6页
A new indicator with temperature dependence of the NO3 loss frequency, was developed to study the contribution of NO3 to the oxidation of monoterpenes and NOx removal in the atmosphere. The new indicator arises from t... A new indicator with temperature dependence of the NO3 loss frequency, was developed to study the contribution of NO3 to the oxidation of monoterpenes and NOx removal in the atmosphere. The new indicator arises from the temperature dependence of kinetic constant. The new indicator was applied to data of observation based on differential optical absorption spectroscopy system on the outskirts of Hefei, China. According to the findings, the contribution of monoterpenes to the loss of NO3 was 70%-80%. 展开更多
关键词 NO3 differential optical absorption spectroscopy INDICATOR Loss frequency Oxidation capacity
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差分吸收光谱方法反演大气环境单环芳香烃有机物 被引量:23
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作者 谢品华 付强 +5 位作者 刘建国 刘文清 秦敏 李昂 刘世胜 魏庆农 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2006年第9期1584-1588,共5页
差分吸收光谱技术(differential optical absorption spectroscopy,DOAS)是利用气体分子在紫外-可见光谱范围的特征吸收来测量其浓度含量,如SO2,NO2,O3等。由于大气环境中的芳香烃有机物含量较低,并且其在紫外的特征吸收光谱与O2和O3分... 差分吸收光谱技术(differential optical absorption spectroscopy,DOAS)是利用气体分子在紫外-可见光谱范围的特征吸收来测量其浓度含量,如SO2,NO2,O3等。由于大气环境中的芳香烃有机物含量较低,并且其在紫外的特征吸收光谱与O2和O3分子的吸收谱相互重叠,交叉干扰,使得对芳香烃有机物的测量比较困难。文章利用自制的差分吸收光谱系统,采用与实际测量光程接近、经过插值的氧气分子吸收柱密度作为氧气分子吸收的参考光谱,通过最小二乘拟合去除其干扰,另外采用不同温度下的O3吸收截面作为参考光谱修正O3的温度效应,测量了大气环境中的苯、甲苯、二甲苯和苯酚,表明差分吸收光谱方法能满足大气环境中单环芳香烃的测量。 展开更多
关键词 差分吸收光谱(DOAS) 单环芳香烃 大气环境
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太阳光谱方法测量成都地区大气二氧化氮浓度 被引量:12
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作者 左浩毅 高洁 +2 位作者 程娟 郑玉臣 杨经国 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2006年第7期1356-1359,共4页
文章报道的是用太阳光谱方法测量成都地区NO2浓度的实验研究,使用CCD光学多道分析器采集成都市区和西岭雪山的太阳光谱,以大气上界太阳光谱为参考,对五个分立光谱段以最小二乘法进行数据拟合,应用差分吸收原理解谱,获得了成都市区和西... 文章报道的是用太阳光谱方法测量成都地区NO2浓度的实验研究,使用CCD光学多道分析器采集成都市区和西岭雪山的太阳光谱,以大气上界太阳光谱为参考,对五个分立光谱段以最小二乘法进行数据拟合,应用差分吸收原理解谱,获得了成都市区和西岭雪山NO2浓度。成都市区NO2浓度(垂直柱体密度)在3.1×1016至5.8×1016(molecule.cm-2)之间,西岭雪山的NO2浓度在0.7×1016至1.0×1016(mole-cule.cm-2)之间。随大气温度的上升,NO2浓度有上升趋势。 展开更多
关键词 大气污染 太阳光谱 N02浓度 差分吸收
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被动多轴DOAS技术污染气体垂直柱浓度反演方法研究 被引量:15
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作者 付强 刘文清 +2 位作者 司福祺 张英华 谢品华 《光子学报》 EI CAS CSCD 北大核心 2009年第5期1216-1220,共5页
介绍了基于太阳散射光的多轴被动差分吸收光谱技术与系统及其在大气污染气体垂直柱浓度监测中的应用.实验中利用夫琅和费光谱作为参考光谱,同时将Ring光谱作为一种吸收结构参与拟合去除太阳光谱中的夫琅和费结构和Ring效应对测量结果的... 介绍了基于太阳散射光的多轴被动差分吸收光谱技术与系统及其在大气污染气体垂直柱浓度监测中的应用.实验中利用夫琅和费光谱作为参考光谱,同时将Ring光谱作为一种吸收结构参与拟合去除太阳光谱中的夫琅和费结构和Ring效应对测量结果的影响,并结合辐射传输模型将污染气体斜柱浓度转换为垂直柱浓度,通过"好运北京"奥运限车期间与OMI卫星的对比实验一致得出限车期间NO2有约20%的下降,证实了本方法的可行性. 展开更多
关键词 被动差分吸收光谱技术 多轴 垂直柱浓度 Ring效应
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长光程差分吸收光谱法 被引量:6
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作者 吴桢 虞启琏 +1 位作者 张帆 姚建铨 《环境科学与技术》 CAS CSCD 2003年第1期48-49,共2页
长光程差分吸收光谱法是一种实时、在线监测方法 ,可同时对多种气体进行连续监测。使用这种方法获得的数据经计算机处理后 ,可分析出大气中各种污染物的含量。介绍了这种方法的基本原理、仪器结构及它的应用。
关键词 长光程 差分吸收光谱法 光谱仪
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