25 August 1998 Performance of the active M1 cell for the 2.1-m telescope of the Observatorio Astronomico Nacional de Mexico
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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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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, "Performance of the active M1 cell for the 2.1-m telescope of the Observatorio Astronomico Nacional de Mexico", Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); doi: 10.1117/12.319237; https://doi.org/10.1117/12.319237
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