Performance of the VST secondary mirror support system

Schipani, P.; D’Orsi, Sergio; Fierro, Davide; Marty, Laurent; Perrotta, Francesco; Arcidiacono, Carmelo

doi:10.1117/12.856606

Cited by 12 publications

(8 citation statements)

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“…The repeated positioning accuracy of the parallel platform studied in this paper is more excellent overall than that of the parallel platform in [23,24]. The important indices for the platform indicate the rationality and the effectiveness of the platform design.…”

Section: Summary Of Platform Performance Indicatorsmentioning

confidence: 79%

“…These practical applications include: motion simulators [17,18], parallel machine tools [19,20], a 6-DOF micro vibration simulator [21], and a space optical load isolation system [22]. Most telescope secondary mirror or third mirror adjustment systems use parallel mechanisms, including the Visible and Infrared Survey Telescope for Astronomy (VISTA) secondary mirror system [23], and the Very Large Telescope Survey Telescope (VST) secondary mirror system [24]. In recent years, parallel mechanisms have also increasingly been used in surgical procedures, including spinal surgery [25] and ophthalmic surgery [26].…”

Section: Introductionmentioning

confidence: 99%

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Kinematic Analysis and Performance Test of a 6-DOF Parallel Platform with Dense Ball Shafting as a Revolute Joint

Han

Zhang

et al. 2021

Applied Sciences

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To meet the special requirements of the third mirror adjustment system for an optical telescope, a 6-P-RR-R-RR parallel platform using offset RR-joints is designed with high precision, a large load-to-size ratio and high stiffness. In order to improve the adjustment accuracy and the stiffness of the whole mechanism, each rotating joint in the subchain is designed as a zero-gap bead shaft system. When compared with a traditional Hooke joint, the offset RR joint has certain characteristics, including large carrying capacity and easy processing and adjustment, that effectively reduce the risk of interference with the joint during rotation and increase the working space of the entire machine. Because of the additional variables introduced by the offset joints, the kinematics problem becomes much more complicated. Regarding the P-RRRRR series subchain, the kinematics model is established using the Denavit–Hartenberg parameter method and then solved by the numerical iteration method. The stiffness of the parallel platform is analyzed and tested, including static and fundamental frequency. Motion performance testing of the parallel platform is performed.

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Section: Summary Of Platform Performance Indicatorsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Kinematic Analysis and Performance Test of a 6-DOF Parallel Platform with Dense Ball Shafting as a Revolute Joint

Han

Zhang

et al. 2021

Applied Sciences

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“…The camera provides an alternative curvature wavefront sensor and a guiding system based on four additional CCDs at the outer edge of the mosaic. Further details on VST subsystems are discussed in [18][19][20][21][22][23][24][25][26].…”

Section: Telescope Overviewmentioning

confidence: 99%

Removing static aberrations from the active optics system of a wide-field telescope

et al. 2012

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The wavefront sensor in active and adaptive telescopes is usually not in the optical path toward the scientific detector. It may generate additional wavefront aberrations, which have to be separated from the errors due to the telescope optics. The aberrations that are not rotationally symmetric can be disentangled from the telescope aberrations by a series of measurements taken in the center of the field, with the wavefront sensor at different orientation angles with respect to the focal plane. This method has been applied at the VLT Survey Telescope on the ESO Paranal observatory.

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“…Further details on the telescope subsystems are discussed in Ref. 13 for the image quality error budget, [14][15][16][17][18][19] for the primary mirror support and safety system, [20][21][22][23] for the secondary mirror support system, 24,25 for the control simulations, [26][27][28] for the preliminary activities on axes control, 29,30 for the adapter-rotator and the atmospheric dispersion corrector, 31 and for the alignment.…”

Section: Overview Of the Telescopementioning

confidence: 99%

The tracking control system of the VLT Survey Telescope

Schipani

Arcidiacono

Argomedo

et al. 2012

Review of Scientific Instruments

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The VLT survey telescope is the latest telescope installed at European Southern Observatory's Paranal observatory that is considered one of the best sites for optical astronomy for the excellent seeing conditions. The exceptional quality of the site imposes tight requirements for the telescope tracking system that shall perform very well to fully exploit the extreme sharpness of the Chilean sky. We describe the specific solutions adopted for pointing, servo and guiding systems and the results obtained during the commissioning of the telescope. The hardware implementation relies on industry components and the control solutions privilege both the performance and the future maintainability of the system.

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Performance of the VST secondary mirror support system

Cited by 12 publications

References 0 publications

Kinematic Analysis and Performance Test of a 6-DOF Parallel Platform with Dense Ball Shafting as a Revolute Joint

Kinematic Analysis and Performance Test of a 6-DOF Parallel Platform with Dense Ball Shafting as a Revolute Joint

Removing static aberrations from the active optics system of a wide-field telescope

The tracking control system of the VLT Survey Telescope

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