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21 September 2011 Wavefront reconstruction and piston measurement using Ronchi test
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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.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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