An automatic system for determining solar absorptance and thermal emittance of surfaces from spectral normal reflectance measurements
National Aeronautics and Space Administration, 1965 - Computers - 11 pages
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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1.0 percent 85 percent saving absolute reflectance absorptance and thermal automatic system yields black body card punch cesium chopper and rotating computer to calculate data recording system data reduction determining the solar digital data recording electronic computer electronic digitizing equipment EMITTANCE OF SURFACES encoder Solar absorptance energy flux normalized entrance slit hemispherical reflectance measure hohlraum incremental encoder integrating sphere lamp display Langley Research Center least count Littrow mirror Manual Automatic difference MEASUREMENTS By Louis monochromatic monochromator near-infrared nonambiguous encoder NORMAL REFLECTANCE MEASUREMENTS off-axis parabola oxide reference standard photocells Photoelectric cell Phototub polychromatic illumination potentiometers prism programer punched cards radiation Readout slits recorded reflectance values reference 100 percent reference beam reflectance data registers 1000 counts scan Schematic shaft position sodium chloride SPECTRAL NORMAL REFLECTANCE spectral reflectance spectropho storage units SURFACES FROM SPECTRAL SYSTEM FOR DETERMINING Teichman and Harold test sample thermal emittance spectrophotometer tometer ultraviolet wavelength increment wavelength range