光学窗口后向回波能量模型及特性研究

基于光学窗口后向回波的能量特性进行猫眼效应回波探测系统设计,利用Collins公式建立了光学窗口后向回波的能量模型,通过数值计算研究了后向回波能量的空间传输、空间分布、探测系统接收回波能量等特性,利用搭建的实验装置对模型进行了验证. 结果表明,后向回波能量特性与光学系统的焦距、离焦量、孔径以及入射角密切相关,解决了几何光学方法无法分析能量空间分布的问题;随着入射角的增大,回波光束形心相对激光发射中心会存在一定的偏差量;通过实验验证了在光学窗口视场范围内,入射角对于回波能量空间分布几乎没有影响. 

Energy Model of Retro-Reflection Beam Passing Through Optical Window and Echo Properties

Design of detection system for cat-eye effect echo is mainly based on the energy properties of retro-reflection beam passing through optical window. The energy model of retro-reflection beam is set up by using the Collins formula in this research. The beam energy properties, including the spatial propagation, spatial distribution and echo energy received by detection system, were given by numerical computation. Experiments were implemented to verify the effectiveness of the model. The results show that the energy property of the retro-reflection beam is decided by the factors, such as focal length, aperture size, defocusing amount of the optical system and the incidence angle, which can not be analyzed with geometrical optics method. The echo beam center of figure will drift from the laser emission point when the incidence angle is increased. Experiments also show that, when the incidence angel changes within the range of field of view, the spatial distribution of the retro-reflection beam has little variation.