Piston detection with the classical Ronchi test

Javier Salinas-Luna; Esteban Luna-Aguilar; Luis Salas; Alejandro Cornejo-Rodriguez; Victor M. Garcia

doi:10.1117/12.437101

14 August 2001 Piston detection with the classical Ronchi test

Javier Salinas-Luna, Esteban Luna-Aguilar, Luis Salas, Alejandro Cornejo-Rodriguez, Victor M. Garcia

Proceedings Volume 4419, 4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications; (2001) https://doi.org/10.1117/12.437101
Event: IV Iberoamerican Meeting of Optics and the VII Latin American Meeting of Optics, Lasers and Their Applications, 2001, Tandil, Argentina

Abstract

We propose one method for the phase alignment of segmented mirrors with piston errors. For this, we use the classical Ronchi test to observe fringes around of curvature center, after we take some lines on the Ronchi image for each segment mirror and obtain its intensity vs. pixels, to do the correlation and approximate the amount of pixels or piston displacement for the phase misalignment. Additionally, we get parabolic fit to find resolutions of sub-pixels. At the same time, we use the Shack Interferometer to observe behavior rings centered for this two segment mirrors to compare with the fringes produced with Ronchi test and to achieve resolutions of piston >= 24 (eta) m.

Citation Download Citation

Javier Salinas-Luna, Esteban Luna-Aguilar, Luis Salas, Alejandro Cornejo-Rodriguez, and Victor M. Garcia "Piston detection with the classical Ronchi test", Proc. SPIE 4419, 4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications, (14 August 2001); https://doi.org/10.1117/12.437101

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