Abstract: At present, the space optical remote sensor of china is heading for a large-scale, high-precision development. With that, radiometric calibration device also develops. Systematically, this paper describes the test method that is used to detect the radiance of the large aperture integrating sphere. A testing system is manufactured to test the radiation characteristics of the large aperture integrating sphere, including not only the uniformity, the stability, the cosine characteristics, but also the output uncertainty of the integrating sphere light radiation source calibration system. The diameter of the integrating sphere is 3 000mm, the Opening diameter of the integrating sphere is 1 000mm. Obtained results indicate that the uniformity is 0.11%, the maximum offset of the cosine characteristics is 1.1% at ±20°, and the output uncertainty of this system is 5.94%.

Key words: Integrating sphere, Uniformity, Stability, Cosine, Uncertainty