为满足现代复合光电系统多光轴一致性的在线检测需求, 提出一种基于光学自动瞄准和惯性测量的大间距多光轴夹角测量方法。利用惯性传感器提供一个准确且可移动的基准坐标系, 瞄准被测光轴并测量其在基准坐标系中的单位向量坐标, 再由向量坐标计算光轴夹角, 以此检测光轴一致性。构建了测量系统的原理样机, 并采用蒙特卡罗法对其测量不确定度进行评定。对复合光电系统中激光测距机与红外热像仪的光轴一致性进行实际检测, 实验结果表明, 激光发射轴与瞄准轴的一致性测量误差为24.4″, 红外热像仪光轴与瞄准轴的一致性测量误差为27.0″。采用移动测量的方式, 扩大了测量范围、提高了测量效率, 为野外环境下大间距多光轴一致性在线检测提供了一种有效的手段。

In order to satisfy the on-line detection of multi-optical axis parallelism for modern integrated photoelectric systems, a method of large distance multi-optical axis parallelism detection based on optical aiming and inertial measurement is proposed. An accurate and movable reference coordinate system is established by an inertial sensor. The measured optical axes can be aimed and their vector coordinates in reference coordinate system can be measured by the measurement system. The angle between the measured optical axes can be calculated by their vector coordinates and then the parallelism of measured axes can be detected by their angle at the same time. A prototype of the measurement system is built and its measurement uncertainty is evaluated by the Monte Carlo method. The proposed method is experimentally verified through an actual test between laser rangefinder and infrared thermal imager. The test results show that the measurement error of the parallelism between sighting axis and laser emitting axis can reach 24.4″ and the measurement error of the parallelism between sighting axis and infrared axis can reach 27.0″. The proposed method expands measurement range and improves measurement efficiency by movable measurement. Therefore, it provides a method for large distance multi-optical axis parallelism on-line detection in the wild.