在微光ICCD参数校准装置中，为了获得分辨力、信噪比、最低照度及像面均匀性等参数测试中光源输出不同光照度，需要大动态范围积分球微弱光均匀光源。通过对传统的光源结构以及存在的局限性进行分析，根据微光ICCD综合参数测试中对光源照度的不同要求，设计了弱光均匀漫射光源系统。光源系统采用双积分球模式，利用楔形渐变光阑及可变孔径光阑实现在色温恒定下照度的连续变化，形成不同照度范围的均匀漫射光源，对微光ICCD参数校准装置的弱光均匀漫射光源照度输出范围及均匀性进行了测量，得到该光源的出射光照度范围为(10-7～103)lx，出射光照度均匀性优于98%，光源满足微光ICCD性能参数测试的要求。

In low-light-level(LLL) image-intensified charge coulped device (ICCD) parameters measurement, in order to obtain the testing parameters such as the resolution, the signal-to-noise ratio, the minimum intensity of illumination and the image plane uniformity, the integral ball weak diffuse light system with wide dynamic range is required. Through analyzing the structure and limitation of the traditional light source, and according to the different requirements for the light intensity of illumination in LLL ICCD synthetic parameter tests, a wide dynamic range diffuse light system was designed. The light source system utilized the double-integral ball mode, and through using the wedge gradient variable aperture diaphragm and implementation, the continuous changing of illumination under the constant color temperature was realized, and the uniform diffuse light source with different intensities of illumination ranges was formated. Furthermore,the weak light illumination output range and uniformity of LLL ICCD parameter calibrating device were measured. Results show that the emergent light illumination range of the light source is 10-7lx～103 lx,the emergent light uniformity is 98%, the light source is suitable for measuring the LLL ICCD performance parameters.