成像光谱仪宽视场离轴三反望远系统的光学设计

摘要

Wide field of view,compact configuration and light mass were study hotspots on the design of imaging systems in space optics.The paper describes the study of the design of off-axis three-mirror anastigmatic telescope systems with wide field of view and large relative aperture of imaging spectrometers,in terms of the four aspects of applied specifications analysis,design thinking,design flow,and design optimization of the off-axis three-mirror anastigmatic telescopes system.An off-axis three-mirror telescope system with 700 mm focal length,f′/4 relative aperture and 20° field angle is worked out.The highest degree is four of the off-axis three-mirror anastigmatic telescope system of the imaging spectrometer.Its spectral range is 0.4～2.5μm,and the module translate function is over 0.87 when Nyquist frequency is at 27.8 lp/mm.%视场宽、结构紧凑、质量轻是空间光学系统设计研究的热点。文章从离轴三反望远系统的应用技术指标分析、设计思想、设计流程及光学系统优化4个方面,研究了成像光谱仪用宽视场、大相对孔径离轴三反消像散望远系统的设计问题,设计出一个光谱范围0.4～2.5μm、焦距f′=700mm、相对孔径f′/4、线视场角20°的离轴三反望远系统,次镜为球面,主镜和三镜非球面最高次数为4次,在Nyquist频率27.8对线/mm处,调制传递函数值均大于0.87。