分析了激光外差探测系统中瞄准镜和望远镜光轴不共轴在实际 应用中的不足；提出了利用分光镜和CCD成像技术进行聚焦和瞄准的方法。 当望远镜发射光束会聚到目标物上的光斑最小时,目标物在CCD上成的图 像最清晰,表明此时为最佳焦距；测量过程中,CCD探测到的视场大小不 同,但观测到的视场中心和发射光斑会聚点的位置始终不变,使用过程 中不需要实时调节,大大提高了系统的易操作性和实用性。最后通过实 验得已验证。

In laser heterodyne detection system, the deficiencies of non-coaxial between telescope and aiming in practical applications are analyzed, and an approach by the use of spectroscope and CCD imaging technology to focus and aim is introduced. When the spot of the telescope launch beams convergent to the target is the smallest, and the image is the clearest on CCD, the focus length is optimal; the sizes of the fields of view detected by CCD are different as the distances of target are different, but the target image and the spot location are always at the center of the field of view. So the real-time adjustment is not needed. It improves the operation and practicality greatly. Experiments are verified at last.