轴准直器的参数测定

The Determination of the Parameters of Axial Collimator

叙述了在保证观测高精度的要求下，配置轴准直器的必要性，介绍了轴准直器的测定原理和系统的众多参数，以及在对星过记录时刻修正值中剩下的几个必须测定的参数，并介绍了这些参数的测定方法和测定结果。

It is explained that even if the circularness of the pivot of one meridian circle were controlled within ±0 2μm,there should be an error of ±0 ″04 for the stellar passing hour,and this circularness could not be kept after long wear and tear. The LLMC(Lower Latitude Meridian Circle)relaxes the precision requirements for the pivot.One axial collimator is setted to determine the influence of the circularness of the pivot and the thermal deformation of the forked arms,i.e.,the two perpendicular groups of slits lighted from rear on the focal plane of the collimator form their images on the two pieces of Reticon after reflection on one self-collimation plane mirror in the cavity of the horizontal axis,thus the determination of these errors can be made.At last,the method to determine the scale of Reticon is developed.