Phasing a segmented mirror using the subapertures method

Fausto Escobar-Romero; Fermin-Solomon Granados-Agustin; Alejandro Cornejo-Rodriguez

doi:10.1117/12.611869

14 February 2005 Phasing a segmented mirror using the subapertures method

Fausto Escobar-Romero, Fermin-Solomon Granados-Agustin, Alejandro Cornejo-Rodriguez

Proceedings Volume 5776, Eighth International Symposium on Laser Metrology; (2005) https://doi.org/10.1117/12.611869
Event: Eighth International Conference on Laser Metrology, 2005, Merida, Mexico

Abstract

At the present time, some astronomical telescopes exist with segmented primary mirrors, as those located in Mauna Kea, Hawai. The Keck telescopes are a classical example. With the purpose of collecting light of weak stellar objects, it is necessary to control the segments of the primary mirror of the telescope, so that whole mirror works as a monolithic mirror. In this paper, it is proposed the subapertures method for the alignment of the segments of the primary mirror. The subapertures method finds tilt, tip, and pistons effects or longitudinal displacements as the defocus error; all of them are necessary to achieve the fitting of a series of measurements. It is shown the experimental results for a parabolic mirror divided in two segments using the proposed method; for this case, the particular equations were developed as well as the necessary software for the alignment of the two parts. The experimental results were obtained in a controlled situation in the laboratory. The alignment process is achieved in a short time, and furthermore is an interactive process.

Citation Download Citation

Fausto Escobar-Romero, Fermin-Solomon Granados-Agustin, and Alejandro Cornejo-Rodriguez "Phasing a segmented mirror using the subapertures method", Proc. SPIE 5776, Eighth International Symposium on Laser Metrology, (14 February 2005); https://doi.org/10.1117/12.611869

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