星载紫外全景成像仪光学系统设计

Optical system design of space-based UV panoramic imager

采用全景环形透镜和中继透镜组组合的结构型式设计了一个中心波长360 nm，带宽10 nm，视场360＆#176;＆#215;（70.9＆#176;～73.3＆#176;），焦距5 mm，相对孔径1：3.3的紫外全景成像仪光学系统。针对该光学系统视场大的特点，重点研究了提高其像面照度均匀性的方法。利用CODE V和ZEMAX光学设计软件进行了优化设计和设计结果分析，结果表明：点列图弥散斑半径的RMS值小于1/2像元，弥散斑80%的能量集中在一个像元内，光学传递函数＆gt;0.72@38.5 lp/mm，f-θ畸变控制在0.4%以内，像面照度均匀性达到91%，设计结果满足指标要求，并且体积小，特别适合在空间大气探测等领域应用，也证明了提出的紫外全景成像仪光学设计方法是可行的，可在其他波段推广应用，对全景成像仪的设计具有指导意义。

An optical system of UV limb panoramic imager was designed by using panoramic annular lens （PAL） and relay lens, the central wavelength was 360 nm, the waveband was 10 nm, the field of view was 360＆#176; ＆#215;（70.9＆#176;~73.3＆#176; ）, the focal length was 5 mm, and the relative aperture was 1：3.3. The method of improving the uniformity of image illumination was studied against the large field of view of the optical system. Optimization and analyzsis were performed using CODE V and ZEMAX software. The design result shows that the RMS radius of disc of confusion of spot diagram is less than half of the pixel, 80% of energy is enclosed in a pixel, the MTF is ＆gt;0.72@38.5 lp/mm, the f-θ!distortion is less than 0.4%, the uniformity of image illumination is 91%. The design results satisfy the requirement of the specifications, the volume is small, and suitable to application in space atmosphere sounding. It indicates that the optical design method of UV panoramic imager is feasible, and the design method can be used in other wavebands, it is instructional for designing the panoramic imager.