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Proceedings Paper

Piston detection with the classical Ronchi test
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Paper 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.

Paper Details

Date Published: 14 August 2001
PDF: 4 pages
Proc. SPIE 4419, 4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications, (14 August 2001); doi: 10.1117/12.437101
Show Author Affiliations
Javier Salinas-Luna, Instituto Nacional de Astrofisica Optica y Electronica (Mexico)
Esteban Luna-Aguilar, Univ. Nacional Autonoma de Mexico (Mexico)
Luis Salas, Univ. Nacional Autonoma de Mexico (United States)
Alejandro Cornejo-Rodriguez, Instituto Nacional de Astrofisica Optica y Electronica (Mexico)
Victor M. Garcia, Univ. Nacional Autonoma de Mexico (United States)


Published in SPIE Proceedings Vol. 4419:
4th Iberoamerican Meeting on Optics and 7th Latin American Meeting on Optics, Lasers, and Their Applications

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