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  • INSTRUMENTATION AND PHOTOGRAPHY  (2)
  • 1980-1984  (2)
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  • 1
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    Active cavity radiometer (1981)
    In:  CASI
    Details
    Publication Date: 2006-06-04
    Description: The active cavity radiometer (ACR) experiment on the Spacelab 1 mission to measure the total solar irradiance is discussed. Short and long term variations in the total solar output of optical energy are studied. Solar total irradiance observation provides information on the solar cycle and other long term trends in solar output that are of climatological significance as well as short term solar physics phenomena. The interaction of solar radiation with the Earth's atmosphere, oceans, and land masses provides the primary driving forces for the formation of weather systems and the determination of climate. Astrophysical measurements determine the total energy flux. The principal role of the ACR observations support extended solar irradiance experiments on free flying satellites. Solar irradiance measurements are important in the establishment of the radiation scale at the solar total flux level in the international system of units (SI).
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Marshall Space Flight Center Spacelab Mission 1 Expt. Descriptions; 4 p
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Active cavity radiometer type V (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper deals with a new type of cavity sensor geometry used in the most recent of a series of solar flux pyrheliometers, known as the active cavity radiometer (ACR). The new Type V sensor design incorporates a modification of its predecessor, the ACR IV sensor. This modification decreases the uncertainty within which cavity absorptance can be predicted by more than a factor of 10.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 19; Oct. 1
    Format: text
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    NASA TECHNICAL REPORTS
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