SPECTRAL EFFECTIVE EMISSIVITIES OF NONISOTHERMAL CAVITIES CALCULATED BY THE MONTE-CARLO METHOD

An algorithm based on the Monte Carl method is described that permits the precise calculation of radiant emission characteristics of nonisot hermal blackbody cavities for use as standard sources in radiometry, p hotometry, and radiation thermometry. The algorithm is realized for co nvex axisymmetric specular-diffuse cavities formed by three conical su rfaces. The numerical experiments provide estimates of normal effectiv e emissivities of cylindrical blackbody cavities with flat or conical bottoms for various axisymmetric temperature distributions on the cavi ty walls.