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Author: Ellis D. Harris Publisher: ISBN: Category : Lasers Languages : en Pages : 208
Book Description
Theoretical studies have been conducted to determine the feasibility of employing optical radar techniques for the remote measurement of atmospheric meteorological parameters. These studies show the feasibility of laser radar measurements of atmospheric density, wind velocity, and concentration of water vapor and other variable constituents. Methods of temperature measurement have been identified and are feasible with a foreseeable improvement in the state of the art. An experiment is proposed to characterize atmospheric aerosol size distribution by means of polychromatic laser illumination. (Author).
Author: Ellis D. Harris Publisher: ISBN: Category : Lasers Languages : en Pages : 208
Book Description
Theoretical studies have been conducted to determine the feasibility of employing optical radar techniques for the remote measurement of atmospheric meteorological parameters. These studies show the feasibility of laser radar measurements of atmospheric density, wind velocity, and concentration of water vapor and other variable constituents. Methods of temperature measurement have been identified and are feasible with a foreseeable improvement in the state of the art. An experiment is proposed to characterize atmospheric aerosol size distribution by means of polychromatic laser illumination. (Author).
Author: National Research Council Publisher: National Academies Press ISBN: 0309302196 Category : Technology & Engineering Languages : en Pages : 321
Book Description
In today's world, the range of technologies with the potential to threaten the security of U.S. military forces is extremely broad. These include developments in explosive materials, sensors, control systems, robotics, satellite systems, and computing power, to name just a few. Such technologies have not only enhanced the capabilities of U.S. military forces, but also offer enhanced offensive capabilities to potential adversaries - either directly through the development of more sophisticated weapons, or more indirectly through opportunities for interrupting the function of defensive U.S. military systems. Passive and active electro-optical (EO) sensing technologies are prime examples. Laser Radar considers the potential of active EO technologies to create surprise; i.e., systems that use a source of visible or infrared light to interrogate a target in combination with sensitive detectors and processors to analyze the returned light. The addition of an interrogating light source to the system adds rich new phenomenologies that enable new capabilities to be explored. This report evaluates the fundamental, physical limits to active EO sensor technologies with potential military utility; identifies key technologies that may help overcome the impediments within a 5-10 year timeframe; considers the pros and cons of implementing each existing or emerging technology; and evaluates the potential uses of active EO sensing technologies, including 3D mapping and multi-discriminate laser radar technologies.
Author: National Research Council Publisher: National Academies Press ISBN: 0309084660 Category : Science Languages : en Pages : 181
Book Description
Weather radar is a vital instrument for observing the atmosphere to help provide weather forecasts and issue weather warnings to the public. The current Next Generation Weather Radar (NEXRAD) system provides Doppler radar coverage to most regions of the United States (NRC, 1995). This network was designed in the mid 1980s and deployed in the 1990s as part of the National Weather Service (NWS) modernization (NRC, 1999). Since the initial design phase of the NEXRAD program, considerable advances have been made in radar technologies and in the use of weather radar for monitoring and prediction. The development of new technologies provides the motivation for appraising the status of the current weather radar system and identifying the most promising approaches for the development of its eventual replacement. The charge to the committee was to determine the state of knowledge regarding ground-based weather surveillance radar technology and identify the most promising approaches for the design of the replacement for the present Doppler Weather Radar. This report presents a first look at potential approaches for future upgrades to or replacements of the current weather radar system. The need, and schedule, for replacing the current system has not been established, but the committee used the briefings and deliberations to assess how the current system satisfies the current and emerging needs of the operational and research communities and identified potential system upgrades for providing improved weather forecasts and warnings. The time scale for any total replacement of the system (20- to 30-year time horizon) precluded detailed investigation of the designs and cost structures associated with any new weather radar system. The committee instead noted technologies that could provide improvements over the capabilities of the evolving NEXRAD system and recommends more detailed investigation and evaluation of several of these technologies. In the course of its deliberations, the committee developed a sense that the processes by which the eventual replacement radar system is developed and deployed could be as significant as the specific technologies adopted. Consequently, some of the committee's recommendations deal with such procedural issues.
Author: Frédéric Fabry Publisher: Cambridge University Press ISBN: 1107070465 Category : Science Languages : en Pages : 277
Book Description
This practical full-color textbook introduces the fundamental physics behind radar measurements and their meteorological interpretation. A valuable resource for students, it includes problem sets, case studies, and supplementary electronic material. With a focus on operational and research applications, it is also a useful reference for researchers and professional meteorologists.
Author: Richard I. Ely Publisher: ISBN: Category : Languages : en Pages : 34
Book Description
A study was conducted to determine the feasibility of a meteorological system using a lidar (laser radar) for the remote and rapid measurement of atmospheric parameters. In particular, the feasibility of measuring air density and wind velocity was investigated. It was determined that air density could be measured best by physically measuring the air temperature profile and calculating the density from it. A coaxial laser Doppler system was chosen to measure the two parameters. The broadening of the Rayleigh line determined air temperature and the shift from laser frequency of the particulate scattered line determined wind velocity. The system to be built used a 10-inch, f/13 Schmidt Cassegrain telescope, a single-frequency dye laser, and a tuneable Fabry-Perot interferometer. Single-frequency operation of the dye laser was not achieved so the system was not field tested. The ability of a spherical Fabry-Perot interferometer to measure Doppler shifts was tested in the laboratory. Frequency shifts as low as 1.5 MHz could be detected by an interferometer which had a bandwidth of only 20 MHz. The gains of several flashlamp pumped dyes were measured at 632.8nm. A mixture of 0.00008 M Rhodamine B and 0.00002 M Rhodamine 6G in ethyl alcohol had a gain of 0.34 dB per cm. (Author).
Author: Robert M. Rauber Publisher: John Wiley & Sons ISBN: 1118432657 Category : Science Languages : en Pages : 491
Book Description
A comprehensive introduction to the current technology and application of radar in meteorology and atmospheric sciences Written by leading experts in the field, Radar Meteorology, A first Course offers an introduction to meteorological radar systems and applications, with emphasis on observation and interpretation of physical processes in clouds and weather systems. This comprehensive introduction to the subject offers an overview of the quantities essential to radar meteorology including the radar reflectivity factor, and Doppler, dual-polarization, and multi-wavelength radar variables. The authors highlight wind retrieval from single and multiple Doppler radars, precipitation estimation and hydrometeorological applications, with chapters dedicated to interpretation of radar data from warm season mid-latitude severe weather, winter storms, tropical cyclones and more. In addition, Radar Meteorology highlights research applications of this burgeoning technology, exploring dynamic applications such as space-borne and ground-based vertically pointing radar systems, and cloud, airborne and mobile radars. As meteorological radars are increasingly used professionally for weather observation, forecasting and warning, this much-needed text: Presents an introduction to the technical aspects and current application of radar as used in the meteorology and atmospheric sciences Contains full-colour illustrations that enhance the understanding of the material presented Examines the wide-range of meteorological applications of radar Includes problems at the end of each chapter as a helpful review of the contents Provides full instructor support with all illustrations and answers to problems available via the book’s instructor website. Radar Meteorology offers a much-needed introductory text to the study of radar as applied to meteorology. The text was designed for a one semester course based on the authors' own course in Radar Meteorology at the University of Illinois at Urbana-Champaign.
Author: Michael J. Kavaya Publisher: ISBN: Category : Coherent radar Languages : en Pages : 336
Book Description
The 10th conference on coherent laser radar technology and applications is the latest in a series beginning in 1980, which provides a forum for exchange of information on recent events, current status, and future directions of coherent laser radar (or lidar or lader) technology and applications. This conference emphasizes the latest advancements in the coherent laser radar field, including theory, modeling, components, systems, instrumentation, measurements, calibration, data processing techniques, operational uses, and comparisons with other remote sensing technologies.
Author: Franklin S. Harris Publisher: ISBN: Category : Atmosphere Languages : en Pages : 140
Book Description
A bibliography of 1460 references of the applications of lasers to atmospheric sciences. The subjects covered include: aerosols; clouds; the distribution and motion of atmospheric natural and man-made constituents; winds; temperature; turbulence; scintillation; elastic, Raman and resonance scattering; fluorescence; absorption and transmission; the application of the Doppler effect and visibility. Instrumentation, in particular lidar, is included, also data handling, and interpretation of the data for meteorological processes.
Author: Ellis D. Harris
Author: Ellis D. Harris
Author: National Research Council
Author: National Research Council
Author: 
Author: Frédéric Fabry
Author: Richard I. Ely
Author: Robert M. Rauber
Author: Michael J. Kavaya
Author: 
Author: Franklin S. Harris