Geometric method to measure astigmatism aberration at astronomical telescopes

Details Geometric method to measure astigmatism aberration at astronomical telescopes Geometric method to measure astigmatism aberration at astronomical telescopes

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apopt..46.3439l&link_type=abstract

Applied Optics IP, vol. 46, Issue 17, pp.3439-3443

Physics

Optics

Aberrations (Global), Telescopes, Collimation

Scientific paper

A simple geometrical method to measure the aberration of astigmatism present in the wavefront that emerges from a telescope is presented. The method is based on the analysis of the external contour of the image of a slightly defocused star. An expression elliptical edge is obtained, which links the rms value of Z22 to the geometric parameters of the ellipse. This expression is tested as a function of introduced defocus and astigmatism aberration in telescopes of the San Pedro Martir Observatory. It is shown that the method gives comparable results to wavefront tests, being capable of measuring astigmatism values of ≈60 nm and larger without the need for auxiliary optics.

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