基于被动无热化技术的红外双波段系统

The infrared dual-band optical system based on passive athermalization

由于双色探测器技术逐步成熟，因此设计一种易于实现工程化、结构简单及可靠性高的红外双波段光学系统就显得日益迫切。在分析现有红外光学材料、加工能力和镀膜技术等条件的情况下，通过应用光学被动无热化技术，宽波段消色差理论，设计出了一种简单、紧凑、可靠的红外双波段光学系统。系统通过Znse，ZnS和Ge三种普通红外光学材料的运用实现了在-45℃～＋71℃范围内的被动无热化全折射红外双波段光学系统设计。在16 lp／mm时，全温度范围内系统调制传递函数接近衍射极限，畸变小于5％，并且焦移量控制在微米量级，满足高精度红外双波段光学系统的技术要求。

As the IR dual-color detector technique develops fast, it has found applications in new generation of thermal imagers,with the IR dual band optical system being the critical part. In this paper,based on the existing IR material characteristics and IR wideband optical design are analyzed, and design of total refractive IR dual spectral optical system is proposed,in which ZnS,ZnSe,Ge are used as optical material. It is shown that modulation transfer function（MTF）approach the diffraction limit of 16 lp/mm, and in the range of the temperature the MTF hardly descend,which meet the demands of high precise infrared system.