异形光斑的高精度光束偏转角度测量

大气湍流通常会造成激光光斑畸变为不规则的异形光斑,针对目前四象限探测器(QD)对空间光通信中不规则光斑偏转角度测量精度不足的问题,提出了一种基于多源信息融合的高精度光束偏转角度测量方法.该方法通过对QD及电荷耦合元件(CCD)的数据信息进行融合分析,在保持QD高分辨率和高响应速度的基础上,提高QD对不规则光斑偏转角的测...

High precision deflection angle measurement of irregular light spot

For the space laser communication, the laser spot is usually distorted by the atmospheric turbulence and becomes the irregular shaped spot. To meet the challenge of insufficient angle measurement accuracy with four-quadrant detector (QD) for irregular light spot, a high precision deflection angle measurement method based on multi-source information fusion was proposed. The proposed method improves the measurement accuracy of the irregular spot deflection angle by integrating the data of QD and the image of charge coupled device (CCD), while maintaining high measurement resolution and high response speed of QD-based measurement method. Compared with the conventional QD algorithm, the results of both simulation and experiment show that, with the fusion algorithm, the root mean square error and the peak-to-peak measurement error are reduced by 55.56% and 42.98%, respectively.