An Automatic System for Determining Solar Absorptance and Thermal Emittance of Surfaces from Spectral Normal Reflectance Measurements
National Aeronautics and Space Administration, 1965 - Analog-to-digital converters - 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 coating computer to calculate data recording system data reduction determining the solar difference is centered digital data recording electronic computer electronic digitizing equipment EMITTANCE OF SURFACES energy flux normalized entrance slit hemispherical reflectance measure hohlraum incremental encoder integrating sphere lamp display Langley Research Center least count Littrow mirror magnesium oxide reference Manual Automatic difference MEASUREMENTS By Louis monochromatic monochromator near-infrared nonambiguous encoder NORMAL REFLECTANCE MEASUREMENTS off-axis parabola oxide reference standard photocells Photoelectric cell polychromatic illumination potentiometers programer punched cards radiation Readout slits recorded reflectance values reference beam reflectance data registers 1000 counts rotating mirror mechanism Samplo port scan shaft position SPECTRAL NORMAL REFLECTANCE spectral reflectance spectropho storage units SURFACES FROM SPECTRAL SYSTEM FOR DETERMINING tance and thermal test sample thermal emittance spectrophotometer tometer ultraviolet wavelength increment wavelength range