一种空间相机辐射定标用大面积辐射光源的研制

针对目前空间光学遥感器向着大口径、高精度方向发展相应需要大出光面的积分球辐射光源,本文研制了一种大口径空间相机用积分球辐射定标光源,并使用自制的积分球辐射性能测试装置测试了大口径积分球光源的均匀性、余弦特性和稳定性。研制的积分球辐射定标光源内径为3000mm,出光面直径为1 000mm。测试结果表明,积分球的最大幅亮度为240.13 W·m-2·sr-1,辐亮度调节范围为371.5∶1,辐亮度不稳定性为0.04%/h,光源出口面非均匀性为1.7%,辐射定标光源的不确定度为5%。

Research of large aperture integrating sphere used in the radiative calibration for space remote sensor

This paper designs a large aperture in tegrating sphere radiometric source system.The laboratory radiometric calibratio n is an important part during the development of the space optical remote sensor and its effect is to build the response function between input radiance and out put electric signal.This process usually uses an integrting sphere as the radiom etric source.The principle of radiometric calibration follows full aperture,full field of view and end to end.The extended radiometric source is the standard so urce of laboratory radiometric calibration and is required to illuminate the cam era with full aperture and full field of view,so it must have large hatch diamet er and ideal cosine radiation performance.At present,the radiometric calibration device needs a large-scale integrating sphere.Systematically,this paper descri bes the design method and process of a large aperture integrating sphere.We tes t the radiation characteristics of the large aperture integrating sphere,including the uniformity,the stability,the cosine characteristics and the output uncertai nty.The diameter of the integrating sphere is 3000mm and the opening diameter is 1000mm.The test results indicate that t he output uncertainty of this system is 5%.