Wavefront reconstruction and piston measurement using Ronchi test

Dayana H. Penalver; Fermin Granados-Agustin; David L. Romero-Antequera

doi:10.1117/12.896988

21 September 2011 Wavefront reconstruction and piston measurement using Ronchi test

Dayana H. Penalver, Fermin Granados-Agustin, David L. Romero-Antequera

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Proceedings Volume 8169, Optical Fabrication, Testing, and Metrology IV; 81690A (2011) https://doi.org/10.1117/12.896988
Event: SPIE Optical Systems Design, 2011, Marseille, France

Abstract

Ronchi test represents an economical alternative, with ease implementation and uncertainties in the order of wavelength, to measure the piston between the elements of a segmented mirror. The current trend of using non monolithic surfaces as imaging systems in telescopes or adaptive optical systems in medical devices, open the field for the development of new wavefront sensors that would retrieve information allowing an optimal disposition of the segments to form an image with minimum of optical aberration. This paper uses the Ronchi test to reconstruct the wavefront, and measure the piston between two adjacent mirrors. Based on a geometrical relation, we have developed a computer software that determine the distance between the mirrors and the light source using a nonlinear optimization algorithm. In order to achieve this goal, it is necessary to perform a several stages processing to the input images. Finally, the wavefront reconstruction is carried out using a combined nonlinear optimization and least square algorithm.

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Dayana H. Penalver, Fermin Granados-Agustin, and David L. Romero-Antequera "Wavefront reconstruction and piston measurement using Ronchi test", Proc. SPIE 8169, Optical Fabrication, Testing, and Metrology IV, 81690A (21 September 2011); https://doi.org/10.1117/12.896988

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KEYWORDS

Ronchi rulings

Wavefronts

Image filtering

Wavefront reconstruction

Mirrors

Image segmentation

Linear filtering

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