DEVIATIONS FROM INTEGRATING SPHERE THEORY CAUSED BY CENTRALLY LOCATED SAMPLES
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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A review of the assumptions made in the theory of the classical integrating sphere is given. The validity of these assumptions as applied to a modified integrating sphere is discussed in terms of a computer analysis and experimental data. The results of the analysis indicate that a possible error of 15 percent may be introduced into the absolute reflectance determinations. This can occur when the classical theory is applied to a modified integrating sphere using the angular-hemispherical technique. The parameters considered in the analysis are irradiance, sphere radius, sample reflectance, specular component of the sample, angle of incidence, and detector location.
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