The classical Ronchi test for piston detection

Javier Salinas; Esteban Luna-Aguilar; Luis Salas; Alejandro Cornejo; I. Cruz Torres; Victor M. Garcia

doi:10.1117/12.458682

4 February 2003 Classical Ronchi test for piston detection

Javier Salinas, Esteban Luna-Aguilar, Luis Salas, Alejandro Cornejo, I. Cruz Torres, Victor M. Garcia

Proceedings Volume 4837, Large Ground-based Telescopes; (2003) https://doi.org/10.1117/12.458682
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

We propose a method for piston errors detection in a segmented surface by means of the classical ronchi test. This consists in comparing the ronchigram fringes frequency of a reference and piston segment. The comparison is developed for the correlation method of the intensity vs pixels curves of the reference and piston segment. The presence of the piston term in a ronchigram is assured experimentally for the shack interferometer, it is by observing the coincidence rings centered type fizeau in each segment. The proposed method is applied to a segmented spherical surface with a two segment mirrors, and resolutions of piston ⩾63 ηm are experimentally obtained.

Citation Download Citation

Javier Salinas, Esteban Luna-Aguilar, Luis Salas, Alejandro Cornejo, I. Cruz Torres, and Victor M. Garcia "Classical Ronchi test for piston detection", Proc. SPIE 4837, Large Ground-based Telescopes, (4 February 2003); https://doi.org/10.1117/12.458682

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