"猫眼"探测光学环路的功率密度计算

激光对光电传感器主动侦察是基于光学系统存在的"猫眼"效应.对包括"猫眼"镜头的回波功率和CCD光敏面照度的整个环路进行了推导.分析结果表明:CCD光敏面上的照度随发射激光束散角、照射距离的增大而降低,随大气能见度的提高而增大.同时,探测器探测面的离焦也对CCD光敏面的照度产生较大的影响,离焦量越大,接收到的光照度越小.

Power Density Calculation of "Cat's Eye" Detection Optical Loop

The principle of the active laser surveillance is based on the "cat's eye" effect of optical system. The returned power of the "cat's eye" lens and the illuminance in the CCD photosensitive plane are derived. The analyzed results show that the illuminance in the CCD photosensitive plane decreases with the increase of the laser divergence angle and the illuminated distance, but increases with the atmospheric visibility. At the same time, the focus-out of the detector affects the illumination in the CCD photosensitive plane, too. The illuminance decreases with the increase of the focus-out value.