成像光谱仪工程权衡优化设计的光学结构

对应用需求、卫星可提供资源和技术能力等方面进行综合工程技术权衡,提出了总体优化的光学结构设计方案。设计了在0.4~2.5 μm工作,焦距为800 mm,焦比为4.5,视场为1.43°的非球面三反射镜望远镜和棱镜色散非球面准直-成像光学结构的新型成像光谱仪,其调制传递函数(MTF)达到0.44~0.62,光谱分辨率为3~23 nm,仪器的总重量约为70 kg。在焦平面器件性能和信噪比等技术指标相同的情况下,如果用光栅或干涉式傅里叶变换光谱仪,则需要FN在3以下,仪器的总重量将＞100 kg。取得了成像光谱仪分辨率高、积分时间短,焦平面器件接受的辐射能量弱等参数条件下的权衡优化设计。

Tradeoff optimization design of optical configuration on imaging spectrometer

Using the tradeoff optimization of the application requirement and the available technology, an optimized optical system was introduced to design a new type of imaging spectrometer consisting of a three -mirror-off-axis anastigmat (TMA), a dispersive prism and an asphere mirror collimating and imaging system. This kind of imaging spectrometer works over the spectral region of 0.4~2.5 μm and the focal length is 800 mm, FN=4.5, FOV=1.43°,the MTF can reach 0.44~0.62, spectrum resolution is about 3~23 nm, and the total mass is about 70 kg. While the FN must be within 3 and the total mass will reach 100 kg if uses the type of imaging spectrometer of grating or interference Fourier transform spectrometer at the condition of the same properties of focal plane elements and SNR. It is showed that the system has an optimum configuration in high resolutions of ground and spectrum,short integral time and low accepted radiant energy, it can be used in selecting the optical configuration especially.