Phase diversity wavefront sensing and image restoration applied to high-resolution solar observations

Details Phase diversity wavefront sensing and image restoration applied to high-resolution solar observations Phase diversity wavefront sensing and image restoration applied to high-resolution solar observations

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996phdt........94l&link_type=abstract

Ph.D. Thesis, Stockholm University, (1996)

Astronomy and Astrophysics

Astronomy

10

Scientific paper

An implementation of a phase-diverse speckle imaging (PDS) technique for reducing the effects of aberrations in solar images is described. Such aberrations usually occur in the Earth's atmosphere and in telescopes. PDS is a post-processing technique for measuring such aberrations and for deblurring the images. The code has been extensively tested. Realistic simulations indicate that the systematic errors are small. The wavefront and object estimates calculated from real solar data, collected with the Swedish Vacuum Solar Telescope (SVST), are spatially and temporally consistent with expectations for anisoplanatism and the assumption of no evolution of the solar features on the time scale of a few seconds. Implementation invariance is demonstrated by comparison of the output with that of a separately developed implementation. External reference for the wavefront determination is provided by comparison with theoretical predictions of temporal variation of the telescopic aberrations at the SVST. High-quality image restorations can be made with much less data than is needed by the more established method of speckle interferometry. The usefulness of the technique for astronomical purposes is demonstrated by the successful restoration and analysis of a 29"x29" 70-minute time sequence of solar granulation and bright points. The resolution in the restored data is sufficient to allow the evolution and motion of bright points to be followed in detail.

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