双波段红外光学系统无热化设计

Athermalization Design of Dual-Wavelength Infrared Optical System

介绍了双波段红外光学系统无热化设计的方法,设计了一个双波段无热化红外光学系统。该系统采用二次成像系统构成,利用Ge、ZnS和ZnSe三种材料及引入两个非球面,实现了双波段红外光学系统光学被动无热化设计。系统工作波段为3.7～4.8μm和7.7～10.3μm,结构紧凑,满足100%冷光阑效率要求。像质评定结果表明,光学系统双波段在全温度范围内(-60℃～70℃)像质良好,证明了该方法的正确性与可行性。

The athermalization method for dual-wavelength infrared optical system is introduced. An athermalized dual-wavelength infrared dual-view optical system is designed. The optical system adopts the passive optical athermalization technology and a re-imaging system. A passive optical athermalization design of dual-wavelength infrared optical system is presented by using three common materials Ge, ZnS and ZnSe and two aspherical surfaces. The results show that the optical system working in the 3.7～4.8 μm and 7.7～10.3 μm wavelength bands has a compact structure and can meet the requirement of 100% cold shield efficiency. The imaging performance of dual-wavelength infrared optical system is very well in the temperature range from -60 ℃ to 70 ℃. The correctness and feasibility of the design method are proved.