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  • 1
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    Design, development, and field testing of Infrared Heterodyne Radiometer (IHR) for remote profiling of tropospheric and stratospheric species (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The performance of a dual-channel infrared heterodyne radiometer, designed to remotely monitor the concentration and vertical distribution of selected atmospheric species, is described. Ground based solar viewing measurement using the IHR were performed at selected laser transitions for ammonia (NH3 and ozone O3). Flight tests were conducted aboard the Galileo II, NASA Ames CV-990, on the Latitude Survey Mission. Ozone was the selected atmospheric species for the airborne flight measurements because of the scientific interest in this atmospheric species, the availability of in situ monitors, the coordinated ozone measurements, and the availability of ground truth data. The IHS was operated in the solar viewing mode to determine ozone distributions in the stratosphere and in the nadir viewing mode to determine the ozone distribution in the troposphere. Airborne atmospheric propagation measurements also were carried out at selected CO2 laser transitions.
    Keywords: ENVIRONMENT POLLUTION
    Type: NASA-CR-3448 , A610-IV
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Study of the application of advanced technologies to long-range transport aircraft. Volume 2: Research and development requirements (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Investigations were conducted to evaluate the relative benefits attainable through the exploitation of advanced technologies and to identify future research and development efforts required to permit the application of selected technologies to transport aircraft entering commercial operation in 1985. Results show that technology advances, particularly in the areas of composite materials, supercritical aerodynamics, and active control systems, will permit the development of long-range, high-payload commercial transports operating at high-subsonic speeds with direct operating costs lower than those of current aircraft. These advanced transports also achieve lower noise levels and lower engine pollutant emissions than current transports. Research and development efforts, including analytical investigations, laboratory test programs, and flight test programs, are required in essentially all technology areas to achieve the potential technology benefits.
    Keywords: AIRCRAFT
    Type: NASA-CR-112089
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Feasibility study of the transonic biplane concept for transport aircraft application (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Investigations were conducted to evaluate the feasibility of a transonic biplane consisting of a forward-mounted swept-back lower wing, a rear-mounted swept-forward upper wing, and a vertical fin connecting the wings at their tips. This wing arrangement results in significant reductions in induced drag relative to a monoplane designed with the same span, and it allows for a constant-section fuselage shape while closely matching an ideal area distribution curve for M = 0.95 cruise. However, no significant reductions in ramp weight were achieved for the biplane relative to a monoplane with the same mission capability. Flutter analyses of the biplane revealed both symmetric and antisymmetric instabilities that occur well below the required flutter speed. Further studies will be required to determine if acceptable flutter speeds can be achieved through the elimination of the instabilities by passive means or by active controls. Configurations designed for other missions, especially those with lower Mach numbers and lower dynamic pressures, should be examined since the geometries suitable for those design constraints might avoid the weight penalties and flutter instabilities which prevent exploitation of induced drag benefits for the configuration studied.
    Keywords: AIRCRAFT
    Type: NASA-CR-132462 , LG74ER0077
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Parametric analysis of ATT configurations. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper describes the results of a Lockheed parametric analysis of the performance, environmental factors, and economics of an advanced commercial transport envisioned for operation in the post-1985 time period. The design parameters investigated include cruise speeds from Mach 0.85 to Mach 1.0, passenger capacities from 200 to 500, ranges of 2800 to 5500 nautical miles, and noise level criteria. NASA high performance configurations and alternate configurations are operated over domestic and international route structures. Indirect and direct costs and return on investment are determined for approximately 40 candidate aircraft configurations. The candidate configurations are input to an aircraft sizing and performance program which includes a subroutine for noise criteria. Comparisons are made between preferred configurations on the basis of maximum return on investment as a function of payload, range, and design cruise speed.
    Keywords: AIRCRAFT
    Type: AIAA PAPER 72-757 , American Institute of Aeronautics and Astronautics, Aircraft Design, Flight Test, and Operations Meeting; Aug 07, 1972 - Aug 09, 1972; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Infrared heterodyne spectrometer measurements of vertical profile of tropospheric ammonia and ozone (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Remote sensing of the concentration and vertical distribution of atmospheric gases has been carried out using a dual CO2 laser multichannel infrared heterodyne spectrometer (IHS). The high specificity and nearly quantum-noise-limited sensitivity of the IHS provide the capability of scanning individual signature lines of selected atmospheric constituents in the 9 to 11 micron region. A comprehensive investigation of the spectral overlap between CO2 laser local oscillator transitions and selected atmospheric constituents was performed; measurements of the atmospheric absorption of solar radiation from the ground were carried out at selected laser transitions for ammonia and ozone.
    Keywords: ENVIRONMENT POLLUTION
    Type: AIAA PAPER 77-73 , Aerospace Sciences Meeting; Jan 24, 1977 - Jan 26, 1977; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
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