Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh51a1254s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH51A-1254
Astronomy and Astrophysics
Astrophysics
[7500] Solar Physics, Astrophysics, And Astronomy, [7594] Solar Physics, Astrophysics, And Astronomy / Instruments And Techniques
Scientific paper
The phase diversity method is a useful tool to estimate a wavefront error of a whole optical system from an object through a detector. Generally, in this method, both on-focus and out of focus images are taken simultaneously by splitting a beam just before the final focal plane. From a pair of these two images and known de-focus value, a wavefront error at a pupil which is assumed to be represented a series of the circle polynomials are derived so as to minimize the difference of observed images from the disturbed by the wavefront. In case of the Solar Optical Telescope (SOT), on-focus and out of focus images are taken sequentially by moving a focusing lens. Therefore, the sequence of images may have other aberration than the defocus because of an introduced wavefront error of the moving focusing lens. We describe a modified phase diversity method which can be applied to the SOT. The obtained results, which are useful to improve the image quality, are discussed by comparing the case of standard phase diversity method.
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