Effect of Ceramic Spectral Emissivity Variations on the Computed Luminous Emissivity of the NBS Standard of Light, Volume 13 |
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aperture Aperture-Base Viewfactor apparent luminous emissivity apparent spectral emissivity Approximate Fractional Error average thermal emissivity base and wall base and wall-zone ceramic composing ceramic spectral emissivity ceramic with wavelength composing the sighttube conical base Crova wave Crova wavelength defined mathematically definitions of symbols effect of ceramic emissiv flat base freezing point include the effect inside the sighttube j-th Zone list of terminology luminous deficiencies mathematical analysis section modified nearest-neighbor approximation National Bureau NBS 1970 configuration NBS 1970 design neglects variations normalized base normalized temperature drops paper Photopic Vision Planck blackbody spectral point of platinum power balance equations radiation balance equations Sanders-NRC computer program Sanders-NRC program sighttube ceramic Simplified flow chart sivity spectral deficiencies spectral emissivity variations spectral radiation balance standard of light terminology for definitions thermal conductivity ture Drop values variations with wavelength wall zone wall-zone 1 temperature wavelength see fig zero-order approximations Zonal Spectral Radiation