共孔径光路光轴相对误差在线标定方法研究

Online Calibration Method of Relative Error of Optical Axis in Co-Aperture Optical System

导光式共孔径光电成像系统具有转动负载小、多波段共孔径,可实现静密封等特点,目前被广泛应用于多种平台的光电设备。但其相对于转塔式光电设备而言存在像旋问题。转塔式光电设备的光轴相对误差在不同方位、俯仰角度时保持不变,故可直接通过给跟踪视轴一个固定的拉偏量,以保证各视轴的统一。导光式共孔径光电设备由于像旋的存在,其光轴相对误差在不同方位、俯仰角度时并不一致。以导光式共孔径光电跟踪设备的典型光路为研究对象,分析了由于像旋导致的光轴相对误差变化规律,给出了补偿公式并进行了实验验证,将导光式共孔径光路的光轴相对误差由约192″(RMS)补偿到约15″(RMS)。结果表明本文推导的近似公式可有效补偿导光式共孔径光路的光轴相对误差。

The light-guiding co-aperture optoelectronic imaging system has the characteristics of small rotating load,multiband co-aperture,and can achieve static sealing.At present,it is widely used in optoelectronic devices on multiple platforms.However,compared with the turret type optoelectronic equipment,there is a problem of image rotation.The relative error of the optical axis of the turret-type optoelectronic equipment remains unchanged at different azimuths and pitch angles,so a fixed amount of deflection can be directly given to the tracking viewing axis to ensure the unity of each viewing axis.Due to the existence of image rotation,the relative error of the optical axis of the light-guiding co-aperture optoelectronic device is not consistent at different azimuths and elevation angles.The typical optical path of the light-guided co-aperture optoelectronic tracking device is taken as the analysis object in this paper.The change law of the relative error of the optical axis caused by the image rotation is analyzed in details.The compensation formula is given,and the experimental verification is carried out.The results show that the approximate formula derived in this paper can effectively compensate the relative error of the optical axis of the light-guided co-aperture optical path.