共口径中波/短波偏振红外成像光学系统

Common-Aperture Optical System for MWIR/SWIR Polarization Imager

对中波/短波偏振红外成像光学系统进行了研究,设计了一个新颖的共口径中波/短波偏振红外成像光学系统。该光学系统由全反射式无焦光学系统、分束镜、二级望远系统、偏振组件和红外物镜系统组成,为了约束主反射镜、双面反射镜、分束镜和偏振片的口径,创造性地采用了三次成像光学系统。光波经无焦光学系统后被分束镜分成中波红外波段(3～5μm)和短波红外波段(1～2.5μm),然后分别经两个物镜系统会聚到两个探测器上,实现了双波段共口径成像。给出了光学系统的设计结果,像质良好,满足整机使用要求。

A MWIR/SWIR polarization imaging optical system is presented, and a novel common-aperture optical system for MWIR/SWIR polarization imager is designed. The MWIR optical system is composed by an all-reflective afocal system, a beamsplitter, a secondary telescope, an infrared polarizer, and an infrared objective. For controlling the apertures of the first mirror, the two face reflective mirror, the beamsplitter and the infrared polarizer, a triple imaging optical system is designed. By the beamsplitter the light is divided into the MWIR （3-5 μm） waveband and the SWIR （1 - 2.5μm） waveband, they are converged on two detectors respectively by two objectives, the dual wave-band optical system realized common aperture. The imaging quality is perfect, it can be satisfied to the imager, and the design result is provided.