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  • 1
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    Severe storms measurement system real time data processing and displays (1980)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: The objectives of the system are to provide the system operator with real time system performance check and to provide data recording of all SSMS data. Meteorologists are provided with real time indication of meteorological data measurements including aid for directing flight profiles in real time and aid for directing SSMS operations. A day-to-day feedback is provided to meteorologists, system operators, and flight crews for flight planning on subsequent flight tests days.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA. Marshall Space Flight Center First Sci. Working Group Meeting of Airborne Doppler Lidar Wind Velocity Meas. Program; 15 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Coherent focal volume mapping of a CW CO2 Doppler lidar (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: In this paper, the coherent response to a 100-micron diam spinning wire is determined as a function of its position within the focal volume of a 10.6-micron coherent Doppler lidar, and SNR contours are generated, both transverse to and along the system line of sight. Application of the contours to single-particle scattering is discussed.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Applied Optics (ISSN 0003-6935); 23; 730-733
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Laser Doppler technology applied to atmospheric environmental operating problems (1976)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Carbon dioxide laser Doppler ground wind data were very favorably compared with data from standard anemometers. As a result of these measurements, two breadboard systems were developed for taking research data: a continuous wave velocimeter and a pulsed Doppler system. The scanning continuous wave laser Doppler velocimeter developed for detecting, tracking and measuring aircraft wake vortices was successfully tested at an airport where it located vortices to an accuracy of 3 meters at a range of 150 meters. The airborne pulsed laser Doppler system was developed to detect and measure clear air turbulence (CAT). This system was tested aboard an aircraft, but jet stream CAT was not encountered. However, low altitude turbulence in cumulus clouds near a mountain range was detected by the system and encountered by the aircraft at the predicted time.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: Aircraft Safety and Operating Problems; p 287-302
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Development of a laser Doppler system for the detection and monitoring of atmospheric disturbances (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A Scanning Laser Doppler Velocimeter System (SLDVS) capable of detecting and monitoring atmospheric disturbances, including wake vortices of landing aircraft and vertical wind profiles in the atmosphere was developed. The SLDVS is a focused, continuous wave, CO2 system that determines the line-of-sight velocities of particles in the focal volume by measuring the Doppler shift created by these particles. At present, the SLDVS is designed to have a range coverage of approximately 2000 ft with a vertical angle coverage of approximately 60 deg. It is also designed to detect Doppler velocities of up to 200 ft/sec with a velocity resolution of approximately 1.8 ft/sec. A complete velocity spectrum is provided by the SLDVS at each point in space at which it is focused. The overall operation and performance of the system and the description of its individual components and data handling capabilities were given.
    Keywords: LASERS AND MASERS
    Type: NASA-TM-X-64981
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Focused laser Doppler velocimeter (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A system for remotely measuring velocities present in discrete volumes of air is described. A CO2 laser beam is focused by a telescope at such a volume, a focal volume, and within the focusable range, near field, of the telescope. The back scatter, or reflected light, principally from the focal volume, passes back through the telescope and is frequency compared with the original frequency of the laser, and the difference frequency or frequencies represent particle velocities in that focal volume.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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  • 6
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    Systems simulation for an airport trailing vortex warning system (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The approach, development, and limited system studies associated with a system simulation for an Airport Trailing Vortex Warning System are documented. The usefulness is shown of a systems engineering approach to the problem of developing a system, as dictated by aircraft vortices, which will increase air-traffic flow in the takeoff/landing corridors of busy airports while maintaining the required safety factor for each operation. The simulation program has been developed in a modular form which permits new, more sophisticated component models, when they become available and are required, to be incorporated into the program with a minimum of program modifications. This report documents a limited system study that has been performed using this Total System Simulation Model. The resulting preliminary system requirements, conclusions, and recommendations are given.
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: NASA-TM-X-64704
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Development of a laser Doppler system for the detection and monitoring of atmospheric disturbances (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A description is presented of a scanning laser Doppler velocimeter system (SLDVS) which can be used for the determination and the monitoring of the velocity structure of atmospheric disturbances. The described system has been successfully employed to detect and study the velocity structure of aircraft wake vortices. Vertical wind profiles in a single plane in the atmosphere have also been investigated with the SLDVS. Attention is given to system operational aspects, approaches of vortex data collection, and questions of wind profile data collection.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Electro-optical Systems Design Conference and International Laser Exposition; Nov 11, 1975 - Nov 13, 1975; Anaheim, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Aircraft wake vortex velocity measurements using a scanning CO2 laser Doppler velocimeter (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A CO2 laser Doppler velocimeter was employed in the study of pairs of counterrotating vortices trailing aircraft in an airport air space. A laser positioned on an extended runway centerline scans a vertical plane perpendicular to the centerline. Vortex location, measurement of vortex transport, and measurement of the properties of aircraft wake vortex flow fields are achieved via spectral analysis of the data. Highest amplitude in the spectrum, the associated maximum velocity, the highest velocity above the amplitude threshold, and the total number of frequency (velocity) cells above thresholds are studied as parameters in analysis of the vortex-associated flow field. The profile of the radial variation of tangential velocity is studied, and two special problems are examined: location of the vortex center and error introduced by crosswind.
    Keywords: AERODYNAMICS
    Type: Electro-optical Systems Design Conference and International Laser Exposition; Nov 11, 1975 - Nov 13, 1975; Anaheim, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    The remote measurement of tornado-like flows employing a scanning laser Doppler system (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper deals with a scanning laser Doppler velocimeter system employed in a test program for measuring naturally occurring tornado-like phenomena, known as dust devils. A description of the system and the test program is followed by a discussion of the data processing techniques and data analysis. The system uses a stable 15-W CO2 laser with the beam expanded and focused by a 12-inch telescope. Range resolution is obtained by focusing the optical system. The velocity of each volume of air (scanned in a horizontal plane) is determined from spectral analysis of the heterodyne signal. Results derived from the measurement program and data/system analyses are examined.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: Conference on Radar Meteorology; Oct 26, 1976 - Oct 29, 1976; Seattle, WA
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Laser Doppler dust devil measurements (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A scanning laser doppler velocimeter (SLDV) system was used to detect, track, and measure the velocity flow field of naturally occurring tornado-like flows (dust devils) in the atmosphere. A general description of the dust devil phenomenon is given along with a description of the test program, measurement system, and data processing techniques used to collect information on the dust devil flow field. The general meteorological conditions occurring during the test program are also described, and the information collected on two selected dust devils are discussed in detail to show the type of information which can be obtained with a SLDV system. The results from these measurements agree well with those of other investigators and illustrate the potential for the SLDV in future endeavors.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-TN-D-8429 , M-211
    Format: application/pdf
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