Optical Telescopes Light Concentration Test,

Astronomy is a science of actual measuring. Its all findings and investigations can not be done without the instrument of astronomical observation:telescope and receiving device on the terminal.With the continuous progress on the astronomy.higher and higher standard are being brung forward for the light collecting capability and imaging quality of telescope .The stronger the light collecting capability of telescope.the darker and the farther celestial body could be detected. Similarly,the higher the acuteness of telescope,the clearer astronomical image and the more information about the celestial body could be received so as to offer comprehensive and definitive data for further study.Hence, the check and measurement of the concentration ratio of the telescope with the determinate caliber is the important aspect of the quality detection of telescope all the while.Perfect optical system dose not be inhibited by physical conditions and every object point has ideal point image.However,for the actual optical system,its point image become a speckle because of diffraction of light and aberration.Accordingly, as the major targets weighing the quality of the telescope,its luminous energy concentration degree directly influence the quality of the image of the celestial body. So many kinds of technique about the optical quality testing of telescope have came forth. Hartmann screen test is one of the most classical among them and it has become one of the main testing method on several large-scale telescopes in the world because of some strongpoints suchas briefness, visuality and easy handlment.The image through the350mm telescope of the Yunnan observatory has aberration in general, subsequently,the relative position of the primary mirrior has err when blooming and reinstalling .There is no quantitative quality index for this err all along.In this paper,the auther calculate and describe the...