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Topical Meeting on Spectroscopy in Support of Atmospheric Measurements最新文献

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Diode Laser Heterodyne Spectroscopy of Sulfur Dioxide 二氧化硫的二极管激光外差光谱
Topical Meeting on Spectroscopy in Support of Atmospheric Measurements Pub Date : 1900-01-01 DOI: 10.1364/sam.1980.wp4
J. Sattler, T. Worchesky, W. J. Lafferty
{"title":"Diode Laser Heterodyne Spectroscopy of Sulfur Dioxide","authors":"J. Sattler, T. Worchesky, W. J. Lafferty","doi":"10.1364/sam.1980.wp4","DOIUrl":"https://doi.org/10.1364/sam.1980.wp4","url":null,"abstract":"The use of a HgCdTe photomixer well beyond its 1.2 GHz bandwidth in conjunction with a tunable diode laser has permitted the rapid, precise and accurate frequency measurement of many Doppler-limited infrared. (IR) absorptions lying within ±9 GHz of a CO2 laser emission. With care, IR line centers may be determined to within ±3 MHz. A schematic of the apparatus appears in Fig. 1.","PeriodicalId":199214,"journal":{"name":"Topical Meeting on Spectroscopy in Support of Atmospheric Measurements","volume":"250 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115647452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Photoabsorption in the Schumann-Runge Bands and Continuum of O2 舒曼-龙格带的光吸收和O2的连续谱
Topical Meeting on Spectroscopy in Support of Atmospheric Measurements Pub Date : 1900-01-01 DOI: 10.1364/sam.1980.wp21
A. J. Blake, D. G. McCoy, H. Gies, S. Gibson
{"title":"Photoabsorption in the Schumann-Runge Bands and Continuum of O2","authors":"A. J. Blake, D. G. McCoy, H. Gies, S. Gibson","doi":"10.1364/sam.1980.wp21","DOIUrl":"https://doi.org/10.1364/sam.1980.wp21","url":null,"abstract":"Extensive laboratory measurements of photoabsorption in the Schumann-Runge bands and continuum of molecular oxygen have been made using The University of Adelaide six-metre vacuum ultraviolet monochromator. These measurements have shown for the first time rotational dependence in the band oscillator strengths and have provided comprehensive information about linewidths which is essential to an understanding of predissociation in the band system. The technique used to extract these values from the experimental data will be outlined, together with the results.","PeriodicalId":199214,"journal":{"name":"Topical Meeting on Spectroscopy in Support of Atmospheric Measurements","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127481675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spectroscopic Issues Related to Trace Gas Measurements in the Stratosphere Using the FM-Modulated Tunable Diode Laser Absorption Spectrometer 使用fm调制可调谐二极管激光吸收光谱仪测量平流层中痕量气体的光谱问题
Topical Meeting on Spectroscopy in Support of Atmospheric Measurements Pub Date : 1900-01-01 DOI: 10.1364/sam.1980.tup5
S. Poultney, A. Pires, D. Chen
{"title":"Spectroscopic Issues Related to Trace Gas Measurements in the Stratosphere Using the FM-Modulated Tunable Diode Laser Absorption Spectrometer","authors":"S. Poultney, A. Pires, D. Chen","doi":"10.1364/sam.1980.tup5","DOIUrl":"https://doi.org/10.1364/sam.1980.tup5","url":null,"abstract":"The fm-modulated tunable diode laser absorption spectrometer has been shown to be capable of detecting fractional absorptions of 1 part in 105 for NO under stratospheric conditions.1 This capability implies that trace species concentrations as low as 108 molecules/ cm3 can be detected at 32 Km in conjunction with absorption path lengths of 100m. The filtering properties of the fm/2nd harmonic detection tech nique which make these measurements possible2 also distort the IR signature being detected and make calibration of the measurement necessary. Calibration of fractional absorption is most generally accomplished through the use of calibration cells containing a known amount of gas under known, constant conditions. The trace gases being studied in the stratosphere are subject to a wide range of pressure and temperature conditions. The interplay of distortion, variation of ambient conditions, and calibration technique make interpretation of detected signatures complex. This interpretation can be made more certain by selecting appropriate lines when possible, by recording the ambient conditions of each measurement, and by drawing upon a high resolution spectroscopic data base for each species being studied.","PeriodicalId":199214,"journal":{"name":"Topical Meeting on Spectroscopy in Support of Atmospheric Measurements","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133904120","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Aerosol Sources of Some Types of Glacier Hydrocarbons 几种冰川碳氢化合物的气溶胶来源
Topical Meeting on Spectroscopy in Support of Atmospheric Measurements Pub Date : 1900-01-01 DOI: 10.1364/sam.1980.tup15
H. Wilson, R. Scuderi
{"title":"Aerosol Sources of Some Types of Glacier Hydrocarbons","authors":"H. Wilson, R. Scuderi","doi":"10.1364/sam.1980.tup15","DOIUrl":"https://doi.org/10.1364/sam.1980.tup15","url":null,"abstract":"Recent analyses of ice and snow have shown that there are traces of hydrocarbons in many glaciers in the North Cascade mountains of Washington. (Scuderi, 1980). The organic compounds collect slowly throughout the year on topical snow, but they reach their maximal concentrations of about 200-500 ng liter-1 on late summer ablation surfaces. In fresh winter snow, however, their concentrations fall well below 100 ng liter-1. Snowfields adjacent to vegetated areas are often abnormally rich in hydrocarbons, typically 3-5 mg liter-1, probably as as a result of the accumulation of plant vapors and debris. Films that collect on the surfaces during the summer are buried by winter snows and become permanent stratigraphic features in the glaciers.","PeriodicalId":199214,"journal":{"name":"Topical Meeting on Spectroscopy in Support of Atmospheric Measurements","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134026292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spectrometers and Passive Interferometers 光谱仪和无源干涉仪
Topical Meeting on Spectroscopy in Support of Atmospheric Measurements Pub Date : 1900-01-01 DOI: 10.1364/sam.1980.mb2
D. Murcray
{"title":"Spectrometers and Passive Interferometers","authors":"D. Murcray","doi":"10.1364/sam.1980.mb2","DOIUrl":"https://doi.org/10.1364/sam.1980.mb2","url":null,"abstract":"Spectroscopic instrumentation for atmospheric research has improved dramatically in the last two decades, closely following the development of similar laboratory instrumentation. In some cases the constraints imposed by the field environment have delayed the use of the instrumentation for atmospheric measurements while in other cases the need for the atmospheric data has resulted in the field use of the instrumentation prior to its laboratory use.","PeriodicalId":199214,"journal":{"name":"Topical Meeting on Spectroscopy in Support of Atmospheric Measurements","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122324020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Transform Spectroscopy 变换光谱学
Topical Meeting on Spectroscopy in Support of Atmospheric Measurements Pub Date : 1900-01-01 DOI: 10.1364/sam.1980.mb3
B. Farmer
{"title":"Transform Spectroscopy","authors":"B. Farmer","doi":"10.1364/sam.1980.mb3","DOIUrl":"https://doi.org/10.1364/sam.1980.mb3","url":null,"abstract":"Summary not available.","PeriodicalId":199214,"journal":{"name":"Topical Meeting on Spectroscopy in Support of Atmospheric Measurements","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129409147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Atmospheric Temperature Determination from High Resolution Laser Absorption Measurements 用高分辨率激光吸收测量法测定大气温度
Topical Meeting on Spectroscopy in Support of Atmospheric Measurements Pub Date : 1900-01-01 DOI: 10.1364/sam.1980.tup20
C. Korb, J. Kalshoven, G. Schwemmer, M. Dombrowski
{"title":"Atmospheric Temperature Determination from High Resolution Laser Absorption Measurements","authors":"C. Korb, J. Kalshoven, G. Schwemmer, M. Dombrowski","doi":"10.1364/sam.1980.tup20","DOIUrl":"https://doi.org/10.1364/sam.1980.tup20","url":null,"abstract":"Remote measurements of atmospheric temperature have been demonstrated using a high resolution two-frequency laser technique. In addition, a new technique for measuring the temperature dependence of collision broadened line widths is described. Temperature is one of the most important atmospheric state variables needed for weather forecasting and modeling. Remote measurements of temperature with current satellite passive sensors is limited to accuracies of the order of 2.5K with vertical resolution on the order of 5-10 km. This limits the applicability of this data, particularly m the lower atmosphere. Simulations have shown that the use of high resolution pulsed lasers in a range resolved mode (LIDAR) could lead to significant improvements in both accuracy, 1K, and vertical resolution, 2 km, respectively.(1)","PeriodicalId":199214,"journal":{"name":"Topical Meeting on Spectroscopy in Support of Atmospheric Measurements","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132711664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Absorption Cross-Section of Ozone as Function of Temperature 臭氧随温度变化的吸收截面
Topical Meeting on Spectroscopy in Support of Atmospheric Measurements Pub Date : 1900-01-01 DOI: 10.1364/sam.1980.wp15
A. Bass, R. Paur
{"title":"Absorption Cross-Section of Ozone as Function of Temperature","authors":"A. Bass, R. Paur","doi":"10.1364/sam.1980.wp15","DOIUrl":"https://doi.org/10.1364/sam.1980.wp15","url":null,"abstract":"Observations of ozone concentrations in the earth's upper atmosphere are made by using surface-based Dobson spectrophotometers or instruments carried by balloons and orbiting satellites. Analysis of data from these observations requires knowledge of the absorption cross-sections of ozone for the wavelength at which the measurements are made, and for the temperature of the medium in which the ozone is observed. Discrepencies that have been reported among results from these different experiments have called into question the accuracy of the previously reported1 cross-section values.","PeriodicalId":199214,"journal":{"name":"Topical Meeting on Spectroscopy in Support of Atmospheric Measurements","volume":"271 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134005509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A 400-MHz Bandwidth Autocorrelation Spectrum Analyzer 400-MHz带宽自相关频谱分析仪
Topical Meeting on Spectroscopy in Support of Atmospheric Measurements Pub Date : 1900-01-01 DOI: 10.1364/sam.1980.wp25
P. Ekstrom
{"title":"A 400-MHz Bandwidth Autocorrelation Spectrum Analyzer","authors":"P. Ekstrom","doi":"10.1364/sam.1980.wp25","DOIUrl":"https://doi.org/10.1364/sam.1980.wp25","url":null,"abstract":"Autocorrelation spectral analysis has demonstrated excellent stability, flexibility, and noise floor levels in radio astronomy applications, largely due to its predominantly digital signal processing. Extending this approach to the wide bandwidths required in millimeter-wave stratospheric remote sensing requires advances in fast digital signal processing techniques. To reach a target bandwidth of 400 MHz requires an 800-MHz digitizer sample rate and processing throughput. We have produced in quantity the required delay-multiply-count digital building block (or node) operable above 400 MHz We have demonstrated logic of the speed required for the 800-MHz digitizer and the distributor which divides the data into multiple slower streams for processing by the node cascades, but have not yet completed these faster portions. The completed instrument will offer 2% spectral resolution to 400 MHz total instantaneous bandwidth, and 1% resolution for all total bandwidths below 200 MHz. Observation time penalty due to the 3-level signal representation used is 57%.","PeriodicalId":199214,"journal":{"name":"Topical Meeting on Spectroscopy in Support of Atmospheric Measurements","volume":"82 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123240568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Water Vapor Absorption Parameters For Selected Lines, 715-732nm And 932-961nm(1) 选定谱线715-732nm和932-961nm的水蒸气吸收参数(1)
Topical Meeting on Spectroscopy in Support of Atmospheric Measurements Pub Date : 1900-01-01 DOI: 10.1364/sam.1980.wp20
G. Schwemmer, B. Gentry, T. Wilkerson, L. Giver
{"title":"Water Vapor Absorption Parameters For Selected Lines, 715-732nm And 932-961nm(1)","authors":"G. Schwemmer, B. Gentry, T. Wilkerson, L. Giver","doi":"10.1364/sam.1980.wp20","DOIUrl":"https://doi.org/10.1364/sam.1980.wp20","url":null,"abstract":"Absolute absorption measurements were made on 172 selected lines in the near IR spectrum of H2O. Line strengths and N2 pressure broadening coefficients were determined with standard deviations in the range 1-5% for a majority of the lines. Self-broadening coefficients and pressure shifts were also measured for several lines. The line selection criteria were based on the requirements for remotely measuring atmospheric humidity profiles with narrow-band, tunable, pulsed lasers by means of light detection and ranging (lidar).","PeriodicalId":199214,"journal":{"name":"Topical Meeting on Spectroscopy in Support of Atmospheric Measurements","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116252985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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