摘要
光电系统广泛存在着所谓的"猫眼效应",针对"猫眼"目标的反射特性,建立了正负离焦时"猫眼"目标回波发散角数学模型,采用几何光学方法对正入射条件下具有"猫眼效应"光学系统的回波发散角进行了推导,总结出离焦条件下"猫眼"目标的回波功率计算公式,分析了各因素对"猫眼"目标回波功率的影响,并对理论分析的结果进行了验证。结果表明:"猫眼"目标的回波功率受发射激光参数、大气透过率、"猫眼"目标光学系统参数等诸多因素影响,其中压缩激光发散角、提高发射功率能够显著增强回波功率,增加大气能见度和"猫眼"目标反射面反射率同样增加回波功率,而离焦量的增大则会引起回波功率的衰减。
＂Cat-eye effect＂ exists in most of the electro-optical system widely. In order to analyze this reflective characteristic of the ＂cat-eye＂ target, the mathematic model of divergent angle for reflected wave of ＂cat-eye＂ target had been built when the defocus was positive and negative. The divergent angle of ＂cat-eye effect＂ system was derived by using the method of geometrical optics when the incidence angle was zero. The computation formula of reflected wave power of ＂cat-eye＂ target had been derived in the condition of defous. The various influence factors for the reflected wave power were analyzed. The conclusion was drawn by the analysis software, and verified. The results show that reflected wave power of ＂cat-eye＂ target is influenced by many factors such as the parameters of laser, atmospheric transmittivity, optical system parameters of ＂cat eye target＂. The reflected power will be increased evidently by reducing the divergent angle and enhancing the emitting power, likewise, by increasing atmospheric visibility and reflectivity of the reflecting plane of target, while power of the reflected wave will attenuate with the increasing of the defocus value.
出处
《红外与激光工程》
EI
CSCD
北大核心
2009年第3期420-423,共4页
Infrared and Laser Engineering
关键词
“猫眼”效应
回波发散角
回波功率
离焦量
Cat-eye effect
Reflected wave divergent angle
Reflected wave power
Defocusing distance
