天体测量技术及应用研究组知识库

多功能天文经纬仪是云南天文台新近研制的一种基于通用CCD观测的天体测量望远镜。在这台新型望远镜中,用两个模拟相机分别测量仪器的水平差和高度轴的准直差。当望远镜工作时,望远镜控制系统发出两路触发信号,一路控制数字相机,另一路控制两个模拟相机。两个采集卡分别安装在不同的工作站上,工作在外触发模式。介绍了望远镜的转轴观测模式,主要包含转轴前和转轴后两个观测阶段,采集图像的时刻和数量是由外触发信号控制的。介绍了硬件结构图。说明了软件编写的流程和实现方法,并且对系统中涉及的主要程序算法进行了较为详细的说明。图像采集软件的编写采用VC++和Sapera LT。给出了采集系统软件的工作界面及图像采集系统采集的图像,并对数字相机拍摄的恒星像进行了简单的分析。

A new telescope for astrometry,the YNAO Multi-Function Astronomical Theodolite,has been built in the Yunnan Observatory: Its main imaging device is a digital CCD camera without cooling. Two analog CCD cameras are used to measure telescope pointing errors in the azimuth and altitude directions, respectively. In using the telescope two sets of triggering signals are generated from the telescope control system,for controlling the digital camera and the analog-camera pair, respectively. The two image acquisition cards are separately installed in two workstations and can be operated in an external triggering mode. We describe the telescope operation mode which involves using rotation of the telescope. The observation mode can be described as two sets of exposures, which are before and after the telescope rotation, respectively. The start moments and amounts of exposures are set by external signals. The paper shows the block diagram of the entire image acquisition system and the flowchart of the software of using the system. The paper also gives the details of main programming methods of the software based on the VC + + and Sapera LT. As a demonstration of the effectiveness of the system,we provide a screenshot of the user interface of the software,some images acquired by the cameras, and an analysis of a stellar image recorded by the digital camera.