基于五棱镜的大型平行光管焦面监测技术及误差修正方法

大型平行光管在进行空间环境模拟实验中由于受到温度、气压大幅改变的影响，离焦现象较为严重，为了解决该状态下平行光管离焦量检测难度较大、检测精度不高等问题，提出了一种针对大口径长焦距平行光管焦面位置检测的新方法，可以对平行光管的离焦量进行实时的监测。分析了由五棱镜引入的主要系统误差，并使用更新基准数据的方法将其修正。在口径为700 mm 焦距为18 m 的平行光管上进行了实验，结果表明该系统检焦精度在150 m 以内，满足实验室对大型平行光管焦面位置精度小于200 m 的指标要求。

Monitoring technique of focal plane position for large scale collimator based on pentaprisms and its error compensation method

The large collimator defocus phenomenon becomes more serious due to the substantial change in temperature and atmospheric pressure during the simulation experiments of space environment. In order to solve this problems that there is an increasing difficulty and a bad accuracy when detecting the defocus of collimator, a new method was proposed to detect the focal plane position and monitor the defocus amount in real time for large diameter long focal length collimator. The major systematic errors which induced by the pentaprism were analyzed, and they were corrected by using the method of updating the reference data. Experiments which have been performed on the collimator of 700 mm aperture and 18 m focal length showed that the detection accuracy of focal plane position can be reached 150 m, and it fully met the requirements of optical test in laboratory that position accuracy of focal plane should be less than 200 m for large collimator.