可见光/红外双波段大视场共口径齐焦光学系统

Visible/Infrared Dual-Band Large Field Shared-Aperture and Parfocal Optical System

针对双波段系统光路转换速度慢、不同波段目标信息存在差异的问题，文中结合可见光和长波红外两个波段的特点，设计了可见光/长波红外大视场共口径齐焦光学系统．采用共口径方式同时接收可见光/长波红外两个波段的目标信息，通过齐焦设计提高不同波段目标信息的一致性．研究结果表明：可见光工作波段为0．38～0．76μm ，长波红外工作波段为7．9～9．7μm ，两个波段视场为70＆#176;，焦距为6．1 mm ．可见光传函值在空间频率100 lp/mm处在0．4以上，长波红外传函值在空间频率20 lp/mm处接近0．4，在-40～60℃的温度范围进行消热差．

Aiming at the situation that ,the optical path conversion is slow and the target information of two bands is different ,considering the characteristics of visible light and LWIR ,an optical system of visible /infrared dual-band large field shared-aperture and parfocal is designed .The system can simultaneously receive visible /LWIR two bands target information by sharing aperture ,and enhance the target information consistency of different bands by parfocality design .The results show ：Visible wave is 0 .38~0 .76 μm ,LWIR wave is 7 .9 ~9 .7 μm ,field of the two bands is 70 ＆#176; ,and focal length is 6 .1 mm . The M TF value is above 0 .4 for visible light at the spatial frequency of 100 lp/mm ,the M TF value is close to 0 .4 for LWIR at the spatial frequency of 20 lp/mm ,and athermalization is achieved in the temperature scope of - 40 ~ ＋ 60 ℃ .