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  • Meteorology and Climatology; Earth Resources and Remote Sensing  (2)
  • 1970-1974  (2)
  • 1
    Publication Date: 2019-07-13
    Description: A special GaAs lidar using fiber coupled diode lasers was constructed for the purpose of measuring the extinction coefficient distribution within a large atmospheric volume at a rate compatible with atmospheric kinematics. The technique is based on taking backscatter signature ratios over spatial increments after the returns are normalized by pulse integration. Essential aspects of the lidar design are beam pulse power, repetition rate, detection system dynamic range and decay linearity. It was necessary to preclude the possibility of eye hazard under any operating conditions, including directly viewing the emitting aperture at close distance with a night-adapted eye. The electronic signal processing and control circuits were built to allow versatile operations. Extinction coefficient measurements were made in fog and clouds using a low-power laboratory version of the lidar, demonstrating feasibility. Data are presented showing range squared corrected backscatter profiles converted to extinction coefficient profiles, temporal signal fluctuations, and solar induced background noise. These results aided in the design of the lidar which is described. Functional tests of this lidar and the implications relevant to the design of a prototype model are discussed. This work was jointly sponsored by Sperry Rand Corporation under its Independent Research and Development program; the Air Force Avionics Laboratory, Wright Field, Dayton, Ohio; and the Naval Ammunition Depot, Crane, Indiana.
    Keywords: Meteorology and Climatology; Earth Resources and Remote Sensing
    Type: Conference on Laser Radar Studies of the Atmosphere; Jun 04, 1973 - Jun 06, 1973; Williamsburg, VA; United States|Fifth Conference on Laser Radar Studies of the Atmosphere, June 4-6, 1973, Hilton Inn, Williamsburg, Virginia: Conference Abstracts; 4
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  • 2
    Publication Date: 2019-07-19
    Description: The concept to place electric power generating stations on the oceans off the coast of the United States has instilled new efforts in research for improved understanding of the diffusion properties of the atmosphere in the ocean-air interface. The Atomic Energy Commission has instigated a program by the Meteorology Group at Brookhaven National Laboratory to investigate the low level, on-shore wind systems that dominate many of the coastal regions. Analytical techniques and specialized instrumentation from previous studies at Brookhaven are being used in this new program. The Brookhaven Lidar system is used to measure some of the physical properties of the oil-fog plume originating from a portable smoke generator on a boat off the coast. The oil-fog plume is used as a tracer which can be observed, photographed and measured to determine the diffusive power of the atmosphere associated with the ocean-air interface and the discontinuities found in the ocean-land boundary. This paper will describe the program rather briefly and the oil-fog scattering measurements that have been made with the Lidar system.
    Keywords: Meteorology and Climatology; Earth Resources and Remote Sensing
    Type: Fifth Conference on Laser Radar Studies of the Atmosphere, June 4-6, 1973, Hilton Inn, Williamsburg, Virginia: Conference Abstracts; 78
    Format: application/pdf
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