An Automatic System for Determining Solar Absorptance and Thermal Emittance of Surfaces from Spectral Normal Reflectance Measurements

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National Aeronautics and Space Administration, 1965 - Analog-to-digital converters - 11 pages
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An automatic system is described for use in determining the solar absorptance and thermal emittance of surfaces from spectral reflectance measurements. The system consists of two spectrophotometers used to make optical reflectance measurements, electronic digitizing equipment to record the data, and a high-speed electronic computer to calculate the desired results. Manual and automatic means of data reduction are compared to determine the reliability and reproducibility of the system. A significant decrease in data reduction time is realized with use of the automatic system.

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