引入扩径准直思路, 将集中平行测试的光谱轴线收入一口径恰好的自准直平行光管内, 宽距离的离散光轴或结构由特殊设计的扩径导引臂引入准直系统中测试, 扩径导引臂部分可绕自准直平行光管转动和径向移动, 便于取不同位置的目标, 其导出光轴与平行光管本身光轴的平行精度直接影响系统的测试精度。给出了扩径导引臂的多种导出方案, 以及高精度的自校正方案, 从而使问题大为简化, 且不失精度。实践分析, 导引臂精度优于0.01 mrad。

This paper introduces the extend caliber and collimate method, which receive the centralized axis to a appropriate caliber in collimator on many spectra. The discrete axes which are far from the center are guided to the collimator by the special design arm, extend arm can rotate and slide along the auto-collimator so that different position targets could be required. The parallel precisions between the extended axis and the original axis of collimator affect the testing precision of the which system. The extended arm programs and high precision auto-erecting are given, which not only make the problem easy, but also ensure the precision. In practice the accuracy is better than 0.01 mrad.