基于成像光谱仪的Sagnac干涉仪的优化设计

为了满足仪器的轻量化设计要求，研究了成像光谱仪系统中Sagnac干涉仪的优化设计方法,讨论仪器轻量化设计中干涉仪尺寸与系统前置望远镜倍率的制约关系,通过将Sagnac干涉仪展开为平板玻璃的方法对干涉仪的结构和光路进行分析，根据几何关系推导出Sagnac干涉仪几何尺寸与入射干涉仪的光束孔径和视场角的关系表达式,通过该关系式可以求出干涉仪的尺寸极值和对应的系统前置望远镜倍率大小。以某短波红外光谱仪为例，运用推导出的关系式，计算并给出了优化设计结果。

Optimal design for Sagnac interferometer of imaging spectrometer

The optimal design of Sagnac interferometer was studied to meet the lightweight design requirements of imaging spectrometer. The relationship between Sagnac and the magnification of system's front telescope was discussed. The interferometer's structure and optical paths were analyzed by unfolding it to flat glass. The experiential formula of the geometry dimensions of Sagnac that was changed with the field angle and the aperture of incident light was given. The optimal geometry dimension of Sagnac and the corresponding magnification of system's front telescope could be calculated by the formula, which was called the optimal design. The optimal design result of a short wave spectrometer was calculated as an example using the formula.