Study of a Stellar Interferometer for Astrometry

1.迈克尔逊恒星干涉仪的研制一台迈克尔逊恒星干涉仪在OF PZT观测室中由两个独立的耦合望远镜组成。望远镜的尺寸为：主镜直径D=250 mm，主镜焦距f_1=750 mm，副镜焦距f_2=-7.5 mm。座架是德国式的赤道座架。这两个望远镜是沿南北方向装备的。基线长度为3米。2.恒星干涉仪的孔径迈克尔逊恒星干涉仪的孔径大小对条纹可见度不敏感，假设两个孔径相隔很长的距离。SIT电视摄像机的图像检测和处理对SIT电视摄像机的灵敏度进行了测试，发现当干涉仪的恒星图像约为1 mm时，可以探测到4个磁盒恒星。利用微型计算机和录像机对SIT电视摄像机拍摄的恒星图像和月球图像进行处理。实验望远镜系统的调整和望远镜恒星图像的叠加是通过观测明亮的恒星来进行的，如天鹅座、天鹅座、星座和星座。和木星。本文对波束合成器和延迟补偿器的介绍以及图像处理软件的开发进行了研究。

1. Construction of a Michelson stellar interferometerA Michelson stellar interferometer is constructed in the olf PZT observation room with two independent coude telescopes. Dimensions of the telescopes are as follows: the diameter of the primary mirror D=250mm, the focal length of the primary mirror f_1=750mm, the focal length of the secondary mirror f_2=-7.5mm. The mounting is an equatorial of German type. The two telescope are equipped along the north-south direction. The baseline length is 3m. 2. Aperture diameter of the stellar interferometerSizes of the aperture of a Michelson stellar interferometer are found to be insensitive on fringe visibility, provided that two apertures are separated for a long distance.3. Image detection and process with SIT TV cameraSensitivity of SIT TV camera was tested and it was found that 4 mag stars can be detected when the star image is about 1mm for the interferometer. Stellar images and Moon images taken by SIT TV camera are processed with the aid of a microcomputer and VTR.4. ExperimentsAdjustments of the telescope system and superpositions of stellar images of the coude telescopes were carried out by observing bright stars, such as <alpha>Cyg., <slpha>Aur. and Jupiter. Introduction of the beam combiner and the delay compensator, development of image processing software are studied in this work.