双视场/双色红外消热差光学系统设计

Design of Cual-FOV Athermal Optical System for Infrared Dual-color

双色红外光学系统能够同时获取长波红外与中波红外的波段信息,有利于目标的搜索和识别.本文针对红外热像仪的需求,对双视场/双色红外光学系统进行了设计.实现了4.4～5.4μm/7.8～8.8μm双波段同时清晰成像,在F#为2.68情况下,通过切换变倍组完成9°×6.75°/3°×2.25°双视场转换.通过红外材料与光焦度的合理分配实现了折射式被动消热差设计.设计结果表明,系统在-40℃～+60℃工作温度下,像面稳定、像质优良,能够满足红外热像仪的使用需求.

Dual-color infrared optical systems can obtain LWIR and MWIR information simultaneously,which would be good for the target tracking and recognition.As to the needs of the infrared thermography,dual FOV /dual color infrared optical system is designed with simplified optical configuration.Dual color(4.4~5.4 μm/7.8~8.8 μm) clear imaging is achieved,and double view switch(9°×6.75°/3°×2.25°) can be completed by switching variable group when F# is constant(2.68).Through rational distributions of IR material and focal power,the optical passive athermal design achieves.The results indicate that when the systems works on-40℃~60℃,the image plane is stable and the image quality is excellent,which can meet the using requirement of infrared thermographs.