Approximate Calculating Methods for Cavity Effective Emissivity of Temperature Homogeneous Blackbody

The developments of the establishment and evaluation of blackbody radiation sources in the world,such as different kinds of blackbody radiation sources,calculation methods and models for cavity effective emissivity are described briefly.The calculation formulas for temperature homogeneous cavity effective emissivity are derived by means of integration,and the approximate calculation formulas furtherly derived from these can be taken as the basis for estimation of the cavity effective emissivity of blackbody.