Experimental verification of dispersed fringe sensing as a segment phasing technique using the Keck telescope

被引:69
作者
Shi, F
Chanan, G
Ohara, C
Troy, M
Redding, DC
机构
[1] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[2] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
关键词
D O I
10.1364/AO.43.004474
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Dispersed fringe sensing (DFS) is an efficient and robust method for coarse phasing of segmented primary mirrors (from one quarter of a wavelength to as much as the depth of focus of a single segment, typically several tens of microns). Unlike phasing techniques currently used for ground-based segmented telescopes, DFS does not require the use of edge sensors in order to sense changes in the relative heights of adjacent segments; this makes it particularly well suited for phasing of space-borne segmented telescopes, such as the James Webb Space Telescope. We validate DFS by using it to measure the piston errors of the segments of one of the Keck telescopes. The results agree with those of the Shack-Hartmann-based phasing scheme currently in use at Keck to within 2% over a range of initial piston errors of +/-16 mum. (C) 2004 Optical Society of America
引用
收藏
页码:4474 / 4481
页数:8
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