反激光探测红外双波段光学系统设计

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3~5 m,8~12 m。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。     

Research on Night Vision System Based on Range-Gated Imaging

A design of low-light-level night vision system is described, which can image objects selectively in the specific space. The system can selectively image some objects in specific distances, meanwhile ignore those shelters on the way of observation by combining an intensifying charge coupled device （ICCD） with a near infrared laser assisted in vision, whose operation wavelength matches with the photocathode of the image tube, and adopting the gated mode and adjustable time- delay. A semiconductor laser diode of 100 W in peak power is chosen for illumination. The laser and the image tube operate in 150 ns pulse width and 2 kHz repeat frequency. Some images of different objects at the different distances within 100 m can be obtained clearly, and even behind a grove by using a sampling circuit and a delay control device at 100 W in peak power of semiconductor laser diode, 150 ns in pulse width of laser and image tube, 2 kHz in repeat frequency.