大角度斜入射情况下的猫眼效应激光反射特性

基于角谱衍射理论,采用2维离散傅里叶变换和将双衍射孔径进行投影合并的方法,推导了斜入射情况下猫眼效应反射光的衍射传输过程,通过数值计算分析了入射角和衍射距离对衍射光场分布的影响规律,并实验验证了入射角的影响规律。结果表明,这种方法能够准确描述大角度入射时的反射光衍射光场分布,入射角对其衍射光场分布模式的影响相当于增大了衍射距离。依据入射角与衍射光场分布模式之间的对应关系,可对猫眼目标进行参数识别研究。

Laser reflection characteristics of cat-eye effect under large angle oblique incidence

Based on the theory of angular spectrum diffraction, the diffraction transmission of the cat-eye effect reflected light under oblique incidence is derived by two-dimensional discrete Fourier transform and projection combination of the two diffraction apertures. Through numerical computation, the variation laws of the diffraction field distribution with the incidence angle and diffraction distance are given. Then an experiment is conducted to validate the law affected by the incidence angle. The results show that the method used in this paper can exactly describe the diffraction field distribution of the cat-eye reflected light under large angle oblique incidence, and the effect of incidence angle increase on the diffraction mode of the light field can be equivalent to the effect of diffrac