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利用大气湍流对光束的扩展、背投成像原理和卡塞格林望远系统,提出了一种适用于大气激光通信捕获、对准和跟踪系统的光束对准检测方法,并对其进行理论分析和实验验证。该方法利用光斑形状和光斑形心位置综合解算光束的横向偏移量和轴向偏转量,解决了一般方法无法分辨出光斑在接收焦平面的移动是由于光束横向偏移还是轴向偏转引起的问题,以及光束横向偏移量无法被精确检测的问题。实验结果表明,该方法可有效地对光束对准状态进行检测,最终实现分辨率为2.2μrad的角度偏转量和分辨率为0.25mm的横向偏移的检测。
Based on the propagation of atmospheric turbulence, the principle of rear projection imaging and the Cassegrain telescopic system, a beam alignment detection method suitable for acquisition, alignment and tracking of atmospheric laser communication is proposed and analyzed theoretically. Experimental verification. The method solves the problem that the general method can not tell whether the movement of the light spot in the receiving focal plane is caused by the lateral shift of the light beam or axial deflection by using the shape of the light spot and the position of the centroid of the light spot to comprehensively calculate the lateral offset and the axial offset of the light beam And the problem that the beam lateral offset can not be accurately detected. Experimental results show that the proposed method can effectively detect the beam alignment and finally achieve the angular deflection of 2.2μrad and the lateral offset of 0.25mm.