Computer Science
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spie.7281e...4z&link_type=abstract
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes. Edited by
Computer Science
Scientific paper
A novel approach of co-phasing segmented mirrors using a Dispersed Rayleigh Interferometer (DRI) which is used for measuring the optical path difference between two parallel beams is proposed. Basic principle of DRI is introduced and configuration of co-phasing segmented primary mirrors for a Cassegrain telescope is presented. A fringe processing method called Two-Dimension Fringe Analyzing (TDFA) is proposed to analyze Dispersed Rayleigh Interference Pattern (DRIP) automatically. A bread board including a co-phasing error generator and a DRI is established to demonstration the approach proposed. Preliminary results using the DRI established show that, measurement range reaches 200 μm, repeatability is better than 2nm in whole range under condition of S/N=20 and can be accepted when S/N>8, and measurement error standard deviation in 1 μm range is 5.8nm (S/N=20). All of the data imply that DRI is a wide-range and high-accuracy method for co-phasing of segmented mirror, and can be used in the orbit for its compact configuration and no movement element.
Cao Genrui
Wang Shanshan
Zhu Qiudong
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