Active primary mirror support for the 21-m telescope at the San Pedro Mártir Observatory

Salas, Luis; Gutiérrez, L.; Pedrayes, María H.; Váldez, Jorge; Carrasco, C.; Carrillo, Michael Cesar; Orozco, Benjamín Valera; García, B.; Luna, Esther Martínez; Baraza, Elena; Cuevas, Salvador; Iriarte, A.; Cordero, A.; Harris, O.; Salinas-Quiroz, Fernando; Sohn, Erika; Martínez, L. A.

doi:10.1364/ao.36.003708

Cited by 19 publications

(6 citation statements)

References 7 publications

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“…The primary mirror of 2.1m telescope en SPM has an active Support System (SS) which allows small deformations of it [1]. The SS contents of 18 air bags B 1 , B 2…….. B 18 with controlled air pressures and 3 control points B 19 , B 20 , B 21 .…”

Section: Introductionmentioning

confidence: 99%

Low-cost active optics for 2.1 m at San Pedro Martir: computer simulations

2004

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The support system of the primary mirror of 2.1m telescope at SPM allows correction of some optical aberrations. A low cost Active Optics System (AOS) can be developed based on this property of the support system. Within the preliminary development of this system, computer simulations were being performed. The general propose of simulations was to find the optimal scheme for the wavefront control of the primary mirror. This paper presents results for the wavefront sensor of the AOS proposed for the 2.1m telescope at San Pedro Martir.

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Section: Introductionmentioning

confidence: 99%

Low-cost active optics for 2.1 m at San Pedro Martir: computer simulations

2004

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“…However, large values of astigmatism remain. This is due to the primary mirror, as shown by Salas et al (1997), and was corrected with an active M1 cell. With these corrections in the primary cell, the astigmatism aberration was diminished until 80% of the encircled energy was contained in a 0Љ .6 diameter when a star was imaged by the telescope in the near-infrared.…”

Section: Devices and Experimental Resultsmentioning

confidence: 99%

An Innovative Method for the Alignment of Astronomical Telescopes

Luna¹,

Zazueta²,

Gutiérrez³

2001

PUBL ASTRON SOC PAC

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An algorithm is presented that accomplishes the optical alignment of Cassegrain and Ritchey-Chre ´tien astronomical telescopes. The algorithm does an iterative comparison and minimization of the error between the ideal pattern of the transverse aberration, TA, and the actual or measured pattern of the TA of the telescope. The TA is obtained with a Hartmann mask placed on the base plate of the telescope and is detected by a CCD camera near the focal plane.

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“…Here, we suggest that they could be used as active optical correction devices, reducing the error budget requirements of the primary mirror of a telescope and its active support structure. Active correction of the optical aberrations induced by the primary mirror and support structure already exists on modern telescopes (Wilson et al 1991;Salas et al 1997), but the correction is done by an active support, not using a deformable mirror. One could also correct aberrations introduced by the telescope auxiliary optics.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Liquid Deformable Mirrors for Astronomical Applications: Active Correction of Optical Aberrations From Lower-Grade Optics and Support System

Borra

2012

ApJS

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Deformable mirrors are increasingly used in astronomy. However, they still are limited in stroke for active correction of high amplitude optical aberrations.Magnetic Liquid deformable mirrors (MLDMs) are a new technology that has advantages of high-amplitude deformations and low costs. In this paper we demonstrate extremely high strokes and inter-actuator strokes achievable by MLDMs which can be used in astronomical instrumentation. In particular, we consider the use of such a mirror to suggest an interesting application for the next generation of large telescopes. We present a prototype 91-actuator deformable mirror made of a magnetic liquid (ferrofluid). This mirror uses a technique that linearizes the response of such mirrors by superimposing a large and uniform magnetic field to the magnetic field produced by an array of small coils. We discuss experimental results that illustrate the performance of MLDMs. A most interesting application of MLDMs comes from the fact they could be used to correct the aberrations of large and lower optical quality primary mirrors held by simple support systems. We estimate basic parameters of the needed MLDMs, obtaining reasonable values.

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Active primary mirror support for the 21-m telescope at the San Pedro Mártir Observatory

Abstract: We have designed and installed a new set of actuators for the suspension of the primary mirror of the 2.1-m telescope at San Pedro Mártir. This active optics system has allowed us to correct low-order aberrations identified by several wave-front analysis techniques.

Cited by 19 publications

References 7 publications

Low-cost active optics for 2.1 m at San Pedro Martir: computer simulations

Low-cost active optics for 2.1 m at San Pedro Martir: computer simulations

An Innovative Method for the Alignment of Astronomical Telescopes

Magnetic Liquid Deformable Mirrors for Astronomical Applications: Active Correction of Optical Aberrations From Lower-Grade Optics and Support System

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