Optics and Precision Engineering, Volume. 19, Issue 4, 728(2011)
RC telescope alignment based on out-of-focus stellar image
In order to realize the alignment of large aperture telescopes, the RC telescope alignment techniques were investigated based on the image processing and analysis of out-of-focus stellar images. Firstly, the relationship between the disalignment comas due to decentered or tilted errors and the centers of contour circle was analyzed according to transversal aberration. The decrease of ellipse eccentricity with the increase of major axis length caused by residual astigmatism were investigated after removing the coma. Then, the dependence of spherical aberration caused by longitudinal errors on the least circle radius of defocused stellar image was analyzed. Finally, the analysis above was verified by the emulation of Zemax modeling and how to use the out-of-focus stellar image to guide the alignment process and how to process the image were discussed. Experimental results indicate that both the lateral and longitudinal errors are well consistent with the theoretically analyzed results. The precision errors of coma and astigmatism adjusted respectively by tilt and eccentricity are both less than 5%.
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SUN Jing-wei, CHEN Tao, WANG Jian-li, ZHANG Jin-kai. RC telescope alignment based on out-of-focus stellar image[J]. Optics and Precision Engineering, 2011, 19(4): 728
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Received: Apr. 20, 2010
Accepted: --
Published Online: Jun. 14, 2011
The Author Email: Jing-wei SUN (blizzardmaple@163.com)