Abstract Integrated blackbody emissivity is one of the key uncertainty components of its effective spectral radiance. The measurement principle and experimental system of the laser integral sphere reflectometry were established. The normal spectral emissivity of the integrated cavity blackbodys were experimentally studied at 633nm, the experimental results showed that the effective emissivity of the integrated blackbody was higher than 0.998, and the deviation from the model Carlo simulation result was within 0.04%. The agreement was good within the measurement uncertainty, which validated that the laser integral sphere reflectometry is feasible to estimate the normal spectral emissivity of the integrated cavity blackbody.
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2019, Vol. 40 
