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Proceedings Paper

Measurement of telescope aberrations using phase-diversity method
Author(s): Qiang Li; Sheng Liao; Mangzuo Shen
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Paper Abstract

Atmospheric turbulence and telescope aberrations all contribute to image degradation with ground-based telescopes. For measuring telescope aberrations resulted from atmospheric turbulence, we have developed a method based on phase-diversity technique. The phase-diversity technique is a novel method for reconstructing the object and the distribution of wavefront in pupil plane. Using phase-diversity method, we can independently reconstruct many instantaneous wavefront from pairs of simultaneously recorded focused and defocused images. After that, by averaging these reconstructed wavefront, the telescope aberrations are separated from dynamic wavefront induced by turbulence. The simulation of estimation of telescope aberration using phase-diversity method is conducted. The results show the phase-diversity technique can estimate the telescope aberrations effectively and root-mean-square error is about 0.08 wavelengths.

Paper Details

Date Published: 21 November 2007
PDF: 8 pages
Proc. SPIE 6721, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 67210A (21 November 2007); doi: 10.1117/12.782700
Show Author Affiliations
Qiang Li, Institute of Optics and Electronics (China)
Sheng Liao, Institute of Optics and Electronics (China)
Mangzuo Shen, Institute of Optics and Electronics (China)


Published in SPIE Proceedings Vol. 6721:
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes

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