Study on the accuracy of an IR standard radiation source

This paper gives a theory formula about the accuracy of IR standard radiation source, i.e., blackbody cavity, and details an experiment. The experiment shows that the greater the temperature difference of the blackbody cavity the worse the accuracy of the blackbody cavity is. The experiment results correspond with the theory formula. So, if the temperature distribution of a blackbody cavity is measured, the accuracy of a blackbody cavity can be made certain by the theory formula.