Blackbody simulator with uniform emissivity

摘要

A blackbody simulator which includes a core having a non- spherical cavity and an aperture to the cavity. A substantial portion of the cavity surface is shaped so that the value of the projected solid angle of the aperture with respect to any point of the cavity surface portion is approximately constant. Simplifications to the cavity surface are achieved by increasing the apex angle. Reductions in the size and weight to the cavity may also be achieved by reducing the ratio of the cavity depth to the aperture diameter.