Emitted and Reflected Radiance Calibration of two Large Area Cavity Blackbodies Using the NIST TXR

The emissivity and radiance of two Large Area Cavity Blackbodies (LABBs) were calibrated using the NIST Thermal Transfer Radiometer (TXR) in a thermal vacuum chamber with a warm ambient background at Ball Aerospace and Technologies Corporation. In addition to calibrating these quantities for a single viewing configuration, the radiance and emissivity were measured with the TXR as a function of linear position from the center of the cavity and angular position relative to the normal to the cavity plane. These results and supported modeling will be presented.