反激光探测红外双波段光学系统设计

Design of infrared dual band optical system based on anti-laser detection

针对激光主动探测技术对光电设备的威胁,提出了通过光敏面倾斜设计来改变激光回波偏转角,从而提升系统反激光主动探测性能的方法。设计了一款光敏面倾斜为5°的中/长波双波段反激光探测光学系统,利用自由曲面校正了光敏面倾斜引入的像差。所设计的系统工作波段为3~5μm,8~12μm。视场角为±2.4°,F数为2。设计结果表明,在奈奎斯特频率17 lp/mm处,两个波段传递函数均高于0.38,满足红外系统对成像质量的要求。通过反追光迹分析得出系统的被探测距离得到有效降低。

Aiming at the threat of laser active detection technology to electro-optical devices, a method using photosensitive surface inclined design to reduce the laser echo energy was proposed, so as to improve the system performance of anti-laser detection. A middle and long wave dual band infrared anti-laser detection optical system was designed whose photosensitive surface inclined 5°. The aberration of the photosensitive surface was corrected by using the free-form surface. The designed system operating band was 3-5 μm, 8-12 μm. The field angle was ±2.4°, the number of F was 2. This result shows that the transmission function of the two bands is higher than 0.38 at the frequency of 17 lp/mm of Nyquist, which satisfies the requirement of imaging quality of infrared system. Then, through the anti-chase track analysis, the detection distance of the system is effectively reduced.