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  • SPACECRAFT INSTRUMENTATION  (3)
  • GEOPHYSICS  (1)
  • 1985-1989  (4)
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  • 1
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    Characteristics of the earth radiation budget experiment solar monitors (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The earth radiation budget experiment solar monitors, active cavity pyrheliometers, have been developed to measure every two weeks the total optical solar irradiance from the earth radiation budget satellite (ERBS) and the National Oceanic and Atmospheric Administration NOAA-9 spacecraft platforms. In the unfiltered 0.2-50-micron wavelength broadband region, the monitors were used to obtain 1365 W/sq m as the mean value for the solar irradiance, with measurement precisions and accuracies approaching 0.1 and 0.2 percent, respectively. The design and characteristics of the solar monitors are presented along with the data reduction model. For the October 1984 through July 1985 period, the resulting ERBS and NOAA-9 solar irradiance values are intercompared.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Applied Optics (ISSN 0003-6935); 26; 3090-309
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Comparison of the measured and predicted response of the Earth Radiation Budget Experiment active cavity radiometer during solar observations (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The Earth Radiation Budget Experiment consists of an array of radiometric instruments placed in earth orbit by the National Aeronautics and Space Administration to monitor the longwave and visible components of the earth's radiation budget. Presented is a dynamic electrothermal model of the active cavity radiometer used to measure the earth's total radiative exitance. Radiative exchange is modeled using the Monte Carlo method and transient conduction is treated using the finite element method. Also included is the feedback circuit which controls electrical substitution heating of the cavity. The model is shown to accurately predict the dynamic response of the instrument during solar calibration.
    Keywords: GEOPHYSICS
    Type: Applied Optics (ISSN 0003-6935); 28; 1327-133
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    An improved electrothermal model for the ERBE nonscanning radiometer - Comparison of predicted and measured behavior during solar observations (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The improved Earth Radiation Budget Experiment nonscanning-channels electrothermal model presented is used to model two types of solar observations: those obtained through the solar port during solar calibration, and and those obtained during the satellite pitch-over maneuver, in which the sun is observed by the radiometer while it is in earth-viewing configuration. Thermal noise has been separately studied to evaluate its contribution to the radiative energy absorbed by the active cavity. It is found that the scattering of the collimated solar radiation contributes an average of 0.071 mW during solar calibration.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Optical Radiation Measurements II; Mar 27, 1989 - Mar 28, 1989; Orlando, FL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Characterizations of the Earth Radiation Budget Experiment (ERBE) scanning radiometers (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: NASA's Earth Radiation Budget Experiment employs the Earth Radiation Budget Satellite and the NOAA 9 and 10 spacecraft to obtain absolute measurements of incoming solar radiation, shortwave earth-reflected solar radiation, and longwave earth-emitted radiation, using both scanning and nonscanning radiometers. Each of the three remote-sensing spacecraft carry narrow FOV scanning radiometers whose detection sensors are thermistor bolometers. Attention is presently given to the calibration models and methods employed in characterizing the scanning radiometers' output signals; the design features of the scanners and flight calibration systems are presented.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Optical Radiation Measurements II; Mar 27, 1989 - Mar 28, 1989; Orlando, FL; United States
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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