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Proceedings Paper

Performance of the active M1 cell for the 2.1-m telescope of the Observatorio Astronomico Nacional de Mexico
Author(s): Luis Salas; Leonel Gutierrez; Maria H. Pedrayes; Jorge Valdez; Esteban Luna-Aguilar; C. Carrasco; Michael Cesar Carrillo; B. Garcia; Elfego Ruiz Schneider; Salvador Cuevas; Arturo I. Iriarte Valverde; A. Cordero; Oswaldo N. Harris; Fernando Quiros-Pacheco; Erika Sohn; Luis Artemio Martinez
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Paper Abstract

Optical testing of the 2.1-m telescope in San Pedro Martir, Observatorio Astronomico Nacional de Mexico, by the methods of wavefront curvature sensing and bi-Ronchi analysis, has shown that the telescope suffered of large amounts of astigmatism. We identified these as due to improper primary mirror support and developed an active control system to correct for it. The number and position of the actuators were decided in accordance to the flexural modes that needed to be corrected, resulting in a system of 18 pressure controlled pneumatic actuators, with an outer loop that verifies the load at three hard points. A PID algorithm and matrix inversion are fundamental parts of this outer loop, that guarantees that the M1 mirror is tilted as a rigid body to maintain it properly aligned. The successful performance of the system to correct low order aberrations is reported.

Paper Details

Date Published: 25 August 1998
PDF: 4 pages
Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); doi: 10.1117/12.319237
Show Author Affiliations
Luis Salas, Univ. Nacional Autonoma de Mexico (United States)
Leonel Gutierrez, Univ. Nacional Autonoma de Mexico (Mexico)
Maria H. Pedrayes, Univ. Nacional Autonoma de Mexico (Mexico)
Jorge Valdez, Univ. Nacional Autonoma de Mexico (Mexico)
Esteban Luna-Aguilar, Univ. Nacional Autonoma de Mexico (Mexico)
C. Carrasco, Univ. Autonoma de Baja California (United States)
Michael Cesar Carrillo, Univ. Autonoma de Baja California (United States)
B. Garcia, Univ. Autonoma Nacional de Mexico (United States)
Elfego Ruiz Schneider, Univ. Autonoma Nacional de Mexico (Mexico)
Salvador Cuevas, Univ. Autonoma Nacional de Mexico (Mexico)
Arturo I. Iriarte Valverde, Univ. Autonoma Nacional de Mexico (Mexico)
A. Cordero, Benemerita Univ. Autonoma de Puebla (United States)
Oswaldo N. Harris, Univ. Autonoma Nacional de Mexico (United States)
Fernando Quiros-Pacheco, Univ. Autonoma Nacional de Mexico (Mexico)
Erika Sohn, Univ. Autonoma Nacional de Mexico (Mexico)
Luis Artemio Martinez, Univ. Autonoma Nacional de Mexico (Mexico)


Published in SPIE Proceedings Vol. 3352:
Advanced Technology Optical/IR Telescopes VI
Larry M. Stepp, Editor(s)

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