摘要
根据地面光学天体测量发展的需要和低纬子午环课题目标的要求，叙述了该仪器的总体设计要求和提出这些要求的理由，强调指出了如何高精度地测定仪器的制造误差、安装误差和重力变形、热变形的影响，以及如何消除测量仪器误差的各设备的零点偏差及其漂移的影响，以便保持仪器观测系统的长期稳定性。
In general the design of the LLMC should make its observation suitable for its new observational principle and for the eliminations of the deformations from both gravity and heating.The instrument should be able to observe a star alternatively in the meridian and the prime vertial directions so that the azimuth error and the instant latitude can be absolutely determined.In practice,it can be rotated around its horizontal axis like a transit instrument during observation,therefore,the absolute determinations for some errors can change into the relative determination.It needs an autocollimative plane mirror in the tube.The plane mirror together with the primary and secondary mirrors form an autocollimative system to measure in real time the change of the optical axis.The change contains the flexure of the tube,the displace and rotation between the primary and secondary mirrors. An axis collimationer is required to measure the irregularity of the privots and the heat deformations between two privots.At last,a new method is needed to measure the level error in place of a traditional vial.
出处
《天文研究与技术》
CSCD
1997年第S1期11-15,共5页
Astronomical Research & Technology
