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首页> 外文会议>2015 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments >Design of four-mirror afocal principal system for wide field multichannel infrared imaging
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Design of four-mirror afocal principal system for wide field multichannel infrared imaging

机译：宽视场多通道红外成像四镜共焦主系统设计

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摘要

The image space scanning system is widely used for multichannel infrared imaging to overcome the absence of large infrared focal plane array. The field of view of afocal system directly influences the time resolution of the image space scanning system. The field of view of afocal system is generally less than 7°. Therefore, it is significant to design larger field of view of afocal system for increasing time resolution. The method of four-mirror afocal system design based on primary aberration is explored. The structural parameters are calculated according to magnification and obscuration ratio of each mirror. The conic parameters are calculated according to primary aberration coefficients. The procedure for calculating initial structural parameters is programmed. Then a four-mirror afocal system is designed with an entrance pupil diameter of 200mm, a field of view of 20°×1°, the operating wave band of 3～12μm, compression ratio of 2.5 times and the distance of exit pupil of 620mm. The results indicate that the maximum root mean square (RMS) wavefront error is less than 0.042λ(λ=7.5μm), the maximum optical path difference(OPD) is less than λ/4(λ=3～12μm). It has high imaging quality and the modulation transfer function (MTF) is approached to the diffraction limit. The method of afocal system design can be widely used for wide field multichannel infrared imaging.
机译：图像空间扫描系统广泛用于多通道红外成像，以克服不存在大型红外焦平面阵列的问题。焦点系统的视野直接影响图像空间扫描系统的时间分辨率。聚焦系统的视野通常小于7°。因此，为提高时间分辨率而设计更大焦距系统的视野非常重要。探索了基于主像差的四镜共焦系统设计方法。结构参数是根据每个反射镜的放大率和遮挡率来计算的。根据主要像差系数计算圆锥参数。程序计算初始结构参数。然后设计了四镜无焦点系统，其入射光瞳直径为200mm，视野为20°×1°，工作波段为3〜12μm，压缩比为2.5倍，出射光瞳距离为620mm 。结果表明，最大均方根波前误差小于0.042λ（λ=7.5μm），最大光程差（OPD）小于λ/ 4（λ= 3〜12μm）。它具有很高的成像质量，并且调制传递函数（MTF）接近衍射极限。共焦系统设计方法可广泛用于广域多通道红外成像。

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