Evaluation Of Tropospheric Water Vapor Profiling Using Eye Safe Infrared Differential Absorption Lidar

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Evaluation of Tropospheric Water Vapor Profiling Using Eye-safe, Infrared Differential Absorption Lidar

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Author :
Publisher :
ISBN 13 :
Total Pages : 62 pages
Book Rating : 4.:/5 (683 download)

Book Synopsis Evaluation of Tropospheric Water Vapor Profiling Using Eye-safe, Infrared Differential Absorption Lidar by :

Download or read book Evaluation of Tropospheric Water Vapor Profiling Using Eye-safe, Infrared Differential Absorption Lidar written by and published by . This book was released on 1996 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuous, high quality profiles of water vapor, free of systematic bias, and of moderate temporal and spatial resolution are fundamental to the success of the ARM CART program. In addition, these should be acquired over long periods at low operational and maintenance cost. The development and verification of realistic climate model parameterizations for clouds and net radiation balance, and the correction of other CART site sensor observations for interferences due to the presence of water vapor are critically dependent on water vapor profile measurements. To date, application of profiles have been limited by vertical resolution and uniqueness and high operating cost, or diminished daytime performance, lack of eye-safety, and high maintenance cost. Recent developments in infrared laser and detector technology make possible compact IR differential absorption lidar (DIAL) systems at eye-safe wavelengths. In the studies reported here, we develop DIAL system performance models and examine the potential of solving some of the shortcomings of previous methods using parameters representative of current technologies. These simulations are also applied to determine the strengths and weaknesses unique to the DIAL method for this application.

Feasibility of Tropospheric Water Vapor Profiling Using Infrared Heterodyne Differential Absorption Lidar

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Publisher :
ISBN 13 :
Total Pages : 61 pages
Book Rating : 4.:/5 (683 download)

Book Synopsis Feasibility of Tropospheric Water Vapor Profiling Using Infrared Heterodyne Differential Absorption Lidar by :

Download or read book Feasibility of Tropospheric Water Vapor Profiling Using Infrared Heterodyne Differential Absorption Lidar written by and published by . This book was released on 1995 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuous, high quality profiles of water vapor, free of systematic bias, and of moderate temporal and spatial resolution, acquired over long periods at low operational and maintenance cost, are fundamental to the success of the ARM CART program. The development and verification of realistic climate model parameterizations for clouds and net radiation balance, and the correction of other CART site sensor observations for interferences due to the presence of water vapor are critically dependent on water vapor profile measurements. Application of profiles acquired with current techniques, have, to date, been limited by vertical resolution and uniqueness of solution [e.g. high resolution infrared (IR) Fourier transform radiometry], poor spatial and temporal coverage and high operating cost (e.g. radiosondes), or diminished daytime performance, lack of eye-safety, and high maintenance cost (e.g. Raman lidar). Recent developments in infrared laser and detector technology make possible compact IR differential absorption lidar (DIAL) systems at eye-safe wavelengths. In the study reported here, we develop DIAL system performance models and examine the potential of to solve some of the shortcomings of previous methods using parameterizations representative of current technologies. These models are also applied to diagnose and evaluate other strengths and weaknesses unique to the DIAL method for this application. This work is to continue in the direction of evaluating yet smaller and lower-cost laser diode-based systems for routine monitoring of the lower altitudes using photon counting detection methods. We regard the present report as interim in nature and will update and extend it as a final report at the end of the term of the contract.

Springer Handbook of Atmospheric Measurements

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Author : Thomas Foken
Publisher : Springer Nature
ISBN 13 : 3030521710
Total Pages : 1761 pages
Book Rating : 4.0/5 (35 download)

Book Synopsis Springer Handbook of Atmospheric Measurements by : Thomas Foken

Download or read book Springer Handbook of Atmospheric Measurements written by Thomas Foken and published by Springer Nature. This book was released on 2021-11-09 with total page 1761 pages. Available in PDF, EPUB and Kindle. Book excerpt: This practical handbook provides a clearly structured, concise and comprehensive account of the huge variety of atmospheric and related measurements relevant to meteorologists and for the purpose of weather forecasting and climate research, but also to the practitioner in the wider field of environmental physics and ecology. The Springer Handbook of Atmospheric Measurements is divided into six parts: The first part offers instructive descriptions of the basics of atmospheric measurements and the multitude of their influencing factors, fundamentals of quality control and standardization, as well as equations and tables of atmospheric, water, and soil quantities. The subsequent parts present classical in-situ measurements as well as remote sensing techniques from both ground-based as well as airborn or satellite-based methods. The next part focusses on complex measurements and methods that integrate different techniques to establish more holistic data. Brief discussions of measurements in soils and water, at plants, in urban and rural environments and for renewable energies demonstrate the potential of such applications. The final part provides an overview of atmospheric and ecological networks. Written by distinguished experts from academia and industry, each of the 64 chapters provides in-depth discussions of the available devices with their specifications, aspects of quality control, maintenance as well as their potential for the future. A large number of thoroughly compiled tables of physical quantities, sensors and system characteristics make this handbook a unique, universal and useful reference for the practitioner and absolutely essential for researchers, students, and technicians.

Water Vapor Profiling Using a Widely Tunable Amplified Diode Laser Differential Absorption Lidar (DIAL).

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Author : Michael Drew Obland
Publisher :
ISBN 13 : 9781109929577
Total Pages : 210 pages
Book Rating : 4.9/5 (295 download)

Book Synopsis Water Vapor Profiling Using a Widely Tunable Amplified Diode Laser Differential Absorption Lidar (DIAL). by : Michael Drew Obland

Download or read book Water Vapor Profiling Using a Widely Tunable Amplified Diode Laser Differential Absorption Lidar (DIAL). written by Michael Drew Obland and published by . This book was released on 2007 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis work involved the design, construction, and testing of a highly-tunable Differential Absorption Lidar (DIAL) instrument utilizing an all-semiconductor transmitter. It was an attempt to take advantage of semiconductor laser technology to obtain range-resolved water vapor profiles with an instrument that is cheaper, smaller, and more robust than existing field instruments. The eventual goal of this project was to demonstrate the feasibility of this DIAL instrument as a candidate for deployment in multi-point networks or satellite arrays to study water vapor flux profiles.

Water Vapor Profiling Using a Compact Widely Tunable Diode Laser Differential Absorption Lidar (DIAL)

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Author : Amin Reza Nehrir
Publisher :
ISBN 13 :
Total Pages : 150 pages
Book Rating : 4.:/5 (31 download)

Book Synopsis Water Vapor Profiling Using a Compact Widely Tunable Diode Laser Differential Absorption Lidar (DIAL) by : Amin Reza Nehrir

Download or read book Water Vapor Profiling Using a Compact Widely Tunable Diode Laser Differential Absorption Lidar (DIAL) written by Amin Reza Nehrir and published by . This book was released on 2008 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric water vapor is an important driver of cloud formation, precipitation, and cloud microphysical structure. Changes in the cloud microphysical structure due to the interaction of aerosols and water vapor can produce more reflective clouds, resulting in more incoming solar radiation being reflected back into space, leading to an overall negative radiative forcing. Water vapor also plays an important role in the atmospheric feedback process that acts to amplify the positive radiative forcing resulting from increasing levels of atmospheric CO2. In the troposphere, where the water vapor greenhouse effect is most important, the situation is harder to quantify. A need exists for tools that allow for high spatial resolution range resolved measurements of water vapor number density up to about 4 km. One approach to obtaining this data within the boundary layer is with the Differential Absorption Lidar (DIAL) that is being developed at Montana State University. A differential absorption lidar (DIAL) instrument for automated profiling of water vapor in the lower troposphere has been designed, tested, and is in routine operation. The laser transmitter for the DIAL instrument uses a widely tunable external cavity diode laser (ECDL) to injection seed two cascaded semiconductor optical amplifiers (SOA) to produce a laser transmitter that accesses the 824-841 nm spectral range. The DIAL receiver utilizes a 28-cm-diameter Schmidt-Cassegrain telescope, an avalanche photodiode (APD) detector, and a narrow band optical filter to collect, discriminate, and measure the scattered light. A technique of correcting for the wavelength-dependent incident angle upon the narrow band optical filter as a function of range has been developed to allow accurate water vapor profiles to be measured down to 225 m above the surface. Data comparisons using the DIAL instrument and co-located radiosonde measurements are presented demonstrating the capabilities of the DIAL instrument.

Proceedings of the Fifth Atmospheric Radiation Measurement (ARM) Science Team Meeting

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Author :
Publisher :
ISBN 13 :
Total Pages : 428 pages
Book Rating : 4.:/5 (318 download)

Book Synopsis Proceedings of the Fifth Atmospheric Radiation Measurement (ARM) Science Team Meeting by :

Download or read book Proceedings of the Fifth Atmospheric Radiation Measurement (ARM) Science Team Meeting written by and published by . This book was released on 1995 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Ultra Narrowband Optical Filters for Water Vapor Differential Absorption Lidar (Dial) Atmospheric Measurements

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Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721034208
Total Pages : 34 pages
Book Rating : 4.0/5 (342 download)

Book Synopsis Ultra Narrowband Optical Filters for Water Vapor Differential Absorption Lidar (Dial) Atmospheric Measurements by : National Aeronautics and Space Administration (NASA)

Download or read book Ultra Narrowband Optical Filters for Water Vapor Differential Absorption Lidar (Dial) Atmospheric Measurements written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-12 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Differential absorption lidar (DIAL) systems are being deployed to make vertical profile measurements of atmospheric water vapor from ground and airborne platforms. One goal of this work is to improve the technology of such DIAL systems that they could be deployed on space-based platforms. Since background radiation reduces system performance, it is important to reduce it. One way to reduce it is to narrow the bandwidth of the optical receiver system. However, since the DIAL technique uses two or more wavelengths, in this case separated by 0.1 nm, a fixed-wavelength narrowband filter that would encompass both wavelengths would be broader than required for each line, approximately 0.02 nm. The approach employed in this project is to use a pair of tunable narrowband reflective fiber Bragg gratings. The Bragg gratings are germanium-doped silica core fiber that is exposed to ultraviolet radiation to produce index-of-refraction changes along the length of the fiber. The gratings can be tuned by stretching. The backscattered laser radiation is transmitted through an optical circulator to the gratings, reflected back to the optical circulator by one of the gratings, and then sent to a photodiode. The filter reflectivities were >90 percent, and the overall system efficiency was 30 percent.Stenholm, Ingrid and DeYoung, Russell J.Langley Research CenterBRAGG GRATINGS; DIFFERENTIAL ABSORPTION LIDAR; NARROWBAND; OPTICAL FILTERS; REFLECTANCE; ATMOSPHERIC MOISTURE; BACKSCATTERING; DOPED CRYSTALS

Scientific and Technical Aerospace Reports

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Author :
Publisher :
ISBN 13 :
Total Pages : 312 pages
Book Rating : 4.:/5 (3 download)

Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Shallow Clouds, Water Vapor, Circulation, and Climate Sensitivity

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Author : Robert Pincus
Publisher : Springer
ISBN 13 : 3319772732
Total Pages : 396 pages
Book Rating : 4.3/5 (197 download)

Book Synopsis Shallow Clouds, Water Vapor, Circulation, and Climate Sensitivity by : Robert Pincus

Download or read book Shallow Clouds, Water Vapor, Circulation, and Climate Sensitivity written by Robert Pincus and published by Springer. This book was released on 2018-05-29 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents a series of overview articles arising from a workshop exploring the links among shallow clouds, water vapor, circulation, and climate sensitivity. It provides a state-of-the art synthesis of understanding about the coupling of clouds and water vapor to the large-scale circulation. The emphasis is on two phenomena, namely the self-aggregation of deep convection and interactions between low clouds and the large-scale environment, with direct links to the sensitivity of climate to radiative perturbations. Each subject is approached using simulations, observations, and synthesizing theory; particular attention is paid to opportunities offered by new remote-sensing technologies, some still prospective. The collection provides a thorough grounding in topics representing one of the World Climate Research Program’s Grand Challenges. Previously published in Surveys in Geophysics, Volume 38, Issue 6, 2017 The aritcles “Observing Convective Aggregation”, “An Observational View of Relationships Between Moisture Aggregation, Cloud, and Radiative Heating Profiles”, “Implications of Warm Rain in Shallow Cumulus and Congestus Clouds for Large-Scale Circulations”, “A Survey of Precipitation-Induced Atmospheric Cold Pools over Oceans and Their Interactions with the Larger-Scale Environment”, “Low-Cloud Feedbacks from Cloud-Controlling Factors: A Review”, “Mechanisms and Model Diversity of Trade-Wind Shallow Cumulus Cloud Feedbacks: A Review”, “Structure and Dynamical Influence of Water Vapor in the Lower Tropical Troposphere”, “Emerging Technologies and Synergies for Airborne and Space-Based Measurements of Water Vapor Profiles”, “Observational Constraints on Cloud Feedbacks: The Role of Active Satellite Sensors”, and “EUREC4A: A Field Campaign to Elucidate the Couplings Between Clouds, Convection and Circulation” are available as open access articles under a CC BY 4.0 license at link.springer.com.

Differential Absorption Lidar Measurements of Atmospheric Water Vapor Using a Pseudonise Code Modulated AIGaAs Laser

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Author : Jonathan Andrew Reily Rall
Publisher :
ISBN 13 :
Total Pages : 290 pages
Book Rating : 4.:/5 (33 download)

Book Synopsis Differential Absorption Lidar Measurements of Atmospheric Water Vapor Using a Pseudonise Code Modulated AIGaAs Laser by : Jonathan Andrew Reily Rall

Download or read book Differential Absorption Lidar Measurements of Atmospheric Water Vapor Using a Pseudonise Code Modulated AIGaAs Laser written by Jonathan Andrew Reily Rall and published by . This book was released on 1993 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Instrument Development for Atmospheric Research and Monitoring

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Author : Jens Bösenberg
Publisher : Springer Science & Business Media
ISBN 13 : 3662034050
Total Pages : 420 pages
Book Rating : 4.6/5 (62 download)

Book Synopsis Instrument Development for Atmospheric Research and Monitoring by : Jens Bösenberg

Download or read book Instrument Development for Atmospheric Research and Monitoring written by Jens Bösenberg and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Jens Bosenberg Max-Planck-Institut fur Meteorologie, Bundesstr. 55, D-20146 Hamburg, Germany TESLAS, which stands for Tropospheric Environmental Studies by Laser Sounding, was formed in November 1987 as a subproject of EUROTRAC to enhance the measurement capabilities for vertical profiling of ozone in the troposphere by means of laser remote sensing. For studies of several atmospheric processes related to the formation and redistribution of photo-oxidants there was a clear need for measuring extended time series with appropriate vertical and temporal resolution. These could not be obtained by conventional in situ techniques, at least not with affordable effort, so remote sensing appeared to be the best way to obtain the required information. At the beginning of the subproject, some Differential Absorption Lidar (DIAL) systems for measuring the vertical distribution of ozone already existed, but their use was restricted to very few laboratories and very few measurement campaigns, since the instruments were highly complex, rather unreliable, and required extensive efforts for maintenance and operation by skilled scientists. In addition, the accuracy of these measurements under a variety of meteorological conditions was not really well established. The main tasks within TESLAS therefore were to develop fully the DIAL-methodology for remote sensing of tropospheric ozone, and to develop instruments which are accurate, reliable, easy to operate, and suitable for field deployment or airborne operation.

Design of Advanced Atmospheric Water Vapor Differential Absorption Lidar (Dial) Detection System

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Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781723825002
Total Pages : 44 pages
Book Rating : 4.8/5 (25 download)

Book Synopsis Design of Advanced Atmospheric Water Vapor Differential Absorption Lidar (Dial) Detection System by : National Aeronautics and Space Adm Nasa

Download or read book Design of Advanced Atmospheric Water Vapor Differential Absorption Lidar (Dial) Detection System written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-19 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The measurement of atmospheric water vapor is very important for understanding the Earth's climate and water cycle. The lidar atmospheric sensing experiment (LASE) is an instrument designed and operated by the Langley Research Center for high precision water vapor measurements. The design details of a new water vapor lidar detection system that improves the measurement sensitivity of the LASE instrument by a factor of 10 are discussed. The new system consists of an advanced, very low noise, avalanche photodiode (APD) and a state-of-the-art signal processing circuit. The new low-power system is also compact and lightweight so that it would be suitable for space flight and unpiloted atmospheric vehicles (UAV) applications. The whole system is contained on one small printed circuit board (9 x 15 sq cm). The detection system is mounted at the focal plane of a lidar receiver telescope, and the digital output is read by a personal computer with a digital data acquisition card.Refaat, Tamer F. and Luck, William S., Jr. and DeYoung, Russell J.Langley Research CenterATMOSPHERIC MOISTURE; WATER VAPOR; DESIGN ANALYSIS; DIFFERENTIAL ABSORPTION LIDAR; DETECTION; AVALANCHES; SENSITIVITY; LOW NOISE; PHOTODIODES; SIGNAL PROCESSING; PRINTED CIRCUITS; LOW WEIGHT; SIGNAL TO NOISE RATIOS; ATMOSPHERIC SOUNDING

Atmospheric Water Vapour Differential Absorption Measurements with an Infra-red Sounder

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Author : P. W. Baker
Publisher :
ISBN 13 : 9780642878007
Total Pages : 52 pages
Book Rating : 4.8/5 (78 download)

Book Synopsis Atmospheric Water Vapour Differential Absorption Measurements with an Infra-red Sounder by : P. W. Baker

Download or read book Atmospheric Water Vapour Differential Absorption Measurements with an Infra-red Sounder written by P. W. Baker and published by . This book was released on 1982 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The atmospheric differential absorption by water vapour between tow CO2 laser transmission lines has been measured up to heights of 1.5 km with a groundbased sounder system. Water vapour profiles, some containing distinct layers, have been estimated from long and short pulse soundings, and compared with radiosonde measurements. Strongly scattering aerosol layers, often associated with temperature inversions, cause severe distortion of the long pulse differential absorption profiles, indicating the necessity of using a short pulse technique. This technique shows potential usefulness for the remote measurement of radio refractive index layers in the atmosphere. (Author).

Differential Absorption Lidar Measurements of Atmospheric Water Vapor Using a Pseudonoise Code Modulated AlGaAs Laser

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Author :
Publisher :
ISBN 13 :
Total Pages : 164 pages
Book Rating : 4.:/5 (317 download)

Book Synopsis Differential Absorption Lidar Measurements of Atmospheric Water Vapor Using a Pseudonoise Code Modulated AlGaAs Laser by :

Download or read book Differential Absorption Lidar Measurements of Atmospheric Water Vapor Using a Pseudonoise Code Modulated AlGaAs Laser written by and published by . This book was released on 1994 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Differential Absorption Lidar Measurements of Atmospheric Water Vapor Using a Pseudonoise Code Modulated AIGaAs Laser

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Author : Jonathan A.R. Rall
Publisher :
ISBN 13 :
Total Pages : 145 pages
Book Rating : 4.:/5 (111 download)

Book Synopsis Differential Absorption Lidar Measurements of Atmospheric Water Vapor Using a Pseudonoise Code Modulated AIGaAs Laser by : Jonathan A.R. Rall

Download or read book Differential Absorption Lidar Measurements of Atmospheric Water Vapor Using a Pseudonoise Code Modulated AIGaAs Laser written by Jonathan A.R. Rall and published by . This book was released on 1994 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Differential Absorption Lidar System for High Resolution Water Vapor Measurements in the Troposphere

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Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (474 download)

Book Synopsis A Differential Absorption Lidar System for High Resolution Water Vapor Measurements in the Troposphere by :

Download or read book A Differential Absorption Lidar System for High Resolution Water Vapor Measurements in the Troposphere written by and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Ultra Narrownad Optical Filters for Water Vapor Differential Absorption Lidar (DIAL) Atmospheric Measurements

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Author : Ingrid Stenholm
Publisher :
ISBN 13 :
Total Pages : 25 pages
Book Rating : 4.:/5 (11 download)

Book Synopsis Ultra Narrownad Optical Filters for Water Vapor Differential Absorption Lidar (DIAL) Atmospheric Measurements by : Ingrid Stenholm

Download or read book Ultra Narrownad Optical Filters for Water Vapor Differential Absorption Lidar (DIAL) Atmospheric Measurements written by Ingrid Stenholm and published by . This book was released on 2001 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: