Measurement and Calibration of Optical Axis Changes for Multi-function Astronomical Theodolite

ZHANG Zhen-jun; WANG Jian-cheng; CHENG Xiang-ming; ZHANG Yi-gong; MAO Wei

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Measurement and Calibration of Optical Axis Changes for Multi-function Astronomical Theodolite

更新时间：2020-08-13

- Measurement and Calibration of Optical Axis Changes for Multi-function Astronomical Theodolite
- Optics and Precision Engineering Vol. 27, Issue 11, Pages: 2321-2329(2019)
- 作者机构：
  
  1. 中国科学院大学北京,100039
  2. 中国科学院云南天文台,云南昆明,650216
  3. 中国科学院天体结构与演化重点实验室,云南昆明,650216
- 作者简介：
- 基金信息：
- DOI：
  CLC： P127.2;P127.3;TH752
- Received：12 April 2019，
  
  Revised：30 May 2019，
  
  Published Online：15 November 2019，
  
  Published：15 November 2019
- 稿件说明：
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张桢君王建成程向明张益恭冒蔚,. 多功能天文经纬镜光轴指向变化实测与修正[J]. 光学精密工程, 2019,27(11): 2321-2329

ZHANG Zhen-jun, WANG Jian-cheng, CHENG Xiang-ming etc. Measurement and Calibration of Optical Axis Changes for Multi-function Astronomical Theodolite[J]. Editorial Office of Optics and Precision Engineering, 2019,27(11): 2321-2329
张桢君王建成程向明张益恭冒蔚,. 多功能天文经纬镜光轴指向变化实测与修正[J]. 光学精密工程, 2019,27(11): 2321-2329 DOI：

ZHANG Zhen-jun, WANG Jian-cheng, CHENG Xiang-ming etc. Measurement and Calibration of Optical Axis Changes for Multi-function Astronomical Theodolite[J]. Editorial Office of Optics and Precision Engineering, 2019,27(11): 2321-2329 DOI：

摘要

光轴指向变化是地面天体测量误差最大来源之一，对光轴指向变化做准确测量和修正是获取高精度天体测量数据的必要前提。针对云台天文台多功能天文经纬仪高精度时纬测量工作的需求，分析和测定了光轴指向变化对时纬测量的影响。方法：首先，介绍了多功能天文经纬仪实时测定光轴指向变化的原理和方法。然后对望远镜光轴指向变化进行了实时测定和分析。结果：实验结果表明由于镜筒受重力的影响，相较于测时结果而言，光轴指向变化对测纬结果的影响更大。在天顶距为55度时，最大可以达到2.5"。经过光轴指向变化修正后，测纬精度由1.37"提高到了0.36"，测时精度由0.033s提高到了0.023s。。结论：通过对光轴指向变化的实时测定结果进行分析可以看出时纬测量精度有了显著改善，基本可以满足高精度天体测量需求。

Abstract

Objective: Telescopic optical axis change (OAC) is the biggest source of systematic error of astrometry. Real-time determination and calibration of OAC are the foundation of obtaining high-quality astrometric data. Determination and analysis the influence of OAC on time and latitude measurements should be done to meet the requirement of high-quality astrometric results. Method: First

the influences of OAC on time and latitude measurements are analyzed. The method of determining OAC for Multi-function Astronomical Theodolite is introduced. Then we determine the OAC in real time and analyze the results. Result: Experimental results indicate that the influence of OAC on latitude measurement can reach to 2.5" when the zenith distance is 550

and the precision of latitude measurement can reach 0.36" from 1.37" after the calibration of OCA

the precision of time-measuring can reach 0.023s from 0.033s after the calibration of OCA. Conclusion: The precision of latitude and time measurements is significantly improved and can satisfy the requirements of high-quality astrometry after the measurement and calibration of OAC in real time.

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Measurement and calibration of optical axis changes for multi-function astronomical theodolite

Related Author

Zhen-jun ZHANG

Xiang-ming CHENG

Yi-gong ZHANG

Wei MAO

Related Institution

Yunnan Observatories, Chinese Academy of Sciences

University of Chinese Academy of Sciences

Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences

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