Alignment of two paraboloid off-axis sections by measuring the sagitta

Fermin S. Granados-Agustin; Maria Elizabeth Percino-Zacarias; Sergio Vazquez y Montiel; Alejandro Cornejo-Rodriguez

doi:10.1117/12.513194

26 February 2004 Alignment of two paraboloid off-axis sections by measuring the sagitta

Fermin S. Granados-Agustin, Maria Elizabeth Percino-Zacarias, Sergio Vazquez y Montiel, Alejandro Cornejo-Rodriguez

Author Affiliations +

Proceedings Volume 5252, Optical Fabrication, Testing, and Metrology; (2004) https://doi.org/10.1117/12.513194
Event: Optical Systems Design, 2003, St. Etienne, France

Abstract

The primary reflective surface of the Large Millimeter Telescope (LMT), it will be formed by a set of trapezoidal panels. Each panel has a paraboloid off-axis form and it is constructed with carbon fiber. The paraboloid off-axis surfaces is obtained copying by contact to a mold with the required form. One proposal in order to manufacture each mold, is made it of graphitizing steel fused. And after that, it lathing with a numerical control machine for obtain the paraboid off-axis section. But due to the dimensions of the sections, 5x3 meters for the biggest section; the mold of steel will be formed by two small segments. In consequence, it is necessary in the first place, alignment these segments in order to obtain a mold with a surface approximately continuous, with a minimum precision of 5mm. In this work we present a method in order to alignment these two molds' segments, as well as, the results of alignment obtained for the prototype mold.

Citation Download Citation

Fermin S. Granados-Agustin, Maria Elizabeth Percino-Zacarias, Sergio Vazquez y Montiel, and Alejandro Cornejo-Rodriguez "Alignment of two paraboloid off-axis sections by measuring the sagitta", Proc. SPIE 5252, Optical Fabrication, Testing, and Metrology, (26 February 2004); https://doi.org/10.1117/12.513194

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