远场光束扩展对光斑瞄准偏差影响的实验

在远场大气环境下的激光瞄准过程中,大气湍流效应会造成光束的漂移和扩展,从而影响激光器的瞄准精度。本文基于修正的VonKarman湍流谱和部分相干光在湍流大气中的传输理论,设计了高斯光波经过大气湍流后的光场模拟软件,并在一定气象条件下,通过一种激光光轴瞄准偏差测试系统进行外场实验。该测试系统光束直径≤9mm,接收部分为120mm大口径光学镜头。研究了3km范围内强湍流条件下光束的传输特性;结合实验数据,分析了在湍流大气中远场光传播时波束扩展对激光瞄准精度的影响。基于文中研究结果设计的瞄准偏差补偿方案可提高系统在大气能见度10km范围内的瞄准精度。在激光传输距离3km,斜程仰角为0~45°时,激光光斑偏移计算误差≤0.1mrad。

Experimental Study on Effect of Beam Spreading of Far-field on Aiming Deviation

In the laser aiming process at far-field atmosphere,the atmospheric turbulent will result in beam spreading and wandering and the pointing accuracy of a laser is dropped seriously. Based on the modified Von Karman turbulence spectrum and the theory of partially coherent beam propagating, a light field simulation software of Gaussian beam propagating though atmospheric turbulence was developed, and the transmission characteristics of beam propagating through far-field strong atmospheric turbulence were inves...