Calibration on the Spectral Radiance of Integral Sphere

摘要

We have to make the integral sphere source trace to the standard lamp, when we calibrate the imaging spectrometer. But the standard lamp need to be calibrated by the blackbody firstly. In this paper, we have the integral sphere source trace to the blackbody directly, using the exclusive spectral response of a spectrometer. During the experiments, two spectral responses of thernspectrometer (200nm ~ 1100nm) within 700nm ~ 900nm are obtained separately by measuring thernspectral radiances of the blackbody at 1000℃ and the integral sphere source at some colorrntemperature. We get the equivalent color temperature of the integral sphere source, making use of the consistency of the two spectral responses in theory. After that, we can compute the spectral radiance at the exit of integral sphere by Plank formula. So we not only complete the calibration of the integral sphere source, but also have the integral sphere source trace to the blackbody simultaneously. From the result analysis,we think this method is exact enough for the calibration about the spectral radiation of the integral sphere source.