低纬子午环度盘偏斜问题

Deflection of the Graduator in the LLMC

本文叙述了度盘偏斜现象及其对读数显微镜Reticon比例尺测定值的影响 ,分析了产生度盘偏斜的原因和修正方法 ,文章讨论了是否需要对比例尺加上与天顶距有关的修正项问题 ,结论是只要把度盘偏心控制在 5μm以内 ,就不必加改正。

The phenomenon of the divided circle deflection in the LLMC is narrated in this paper.The effect of the deflection on the measured values of the scales with the Reticon in the reading microscope systems is described.The reasons that make the circle deflection are analyzed,and a modification method is presented.It is discussed that whether or not the scales need to be added for a correction term related to zenith.it is concluded that the term need not to be added if the off-center of the circle is controlled within 5μm.