为了限制多光谱相机中滤光片与探测器靶面之间存在的光谱混叠区域的大小, 提高像元利用率, 详细设计了滤光片阵列.不同于在轨运行时的状态, 实际地面实验测试时滤光片阵列承受较大的内外压差, 面型发生变化, 可能对多光谱相机成像质量造成不良影响.根据有限元分析方法详细分析了滤光片阵列在这种情况下的变形, 利用Zernike多项式拟合形变面型附加于Zemax中原滤光片阵列面型上, 考察多光谱相机光学系统调制传递函数的变化.结果表明: 在内外压差的作用下, 系统调制传递函数未出现明显变化, 可以忽略滤光片阵列表面变形对多光谱相机光学系统成像质量的影响.

In order to limit the size of aliasing area caused by distance between filter-array and the detector and improve efficiency of pixel utilization, the filter-array was designed. Filter-array which is diferent from itself in-orbit state is withstanded greater differential pressure in the ground testing experiment, the surface of filter-array changed, which may adversely affect the quality of multi-spectral imaging camera. Baesd on Finite element method , the deformation of the filter-array was analyzed which is attached to original surface of filter-array in Zemax by means of Zernike polynomials. The changes of the modulation transfer function of multi-spectral imaging camera was studied. The results show that under pressure difference, The modulation transfer function of system is not changed significantly and the impact of filter-array′s deformationon on imaging quality of optical system can be negligible.