<div class="csl-bib-body">
<div class="csl-entry">Sinn, A., Prager, P., Schwaer, C., & Schitter, G. (2022). Design and Evaluation of an Active Secondary Mirror Positioning System for a Small Telescope. <i>JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS</i>, <i>8</i>(02). https://doi.org/10.1117/1.jatis.8.2.029007</div>
</div>
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dc.identifier.issn
2329-4124
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/136923
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dc.description.abstract
This publication presents an active compensation system for the position of the secondary mirror of a small Ritchey-Chrétien telescope system. The goal is to maintain the optical imaging quality under varying gravitational and thermal influences, by compensation for the relative position deviations between the primary and secondary mirrors. An extensive analysis concerning the feasibility of such a system for a commercial off-the-shelf small telescope is performed and used as a basis for the design of the precision measurement and positioning system. The developed prototype uses dimensional metrology to capture relative position errors of the secondary mirror. A newly designed actuator with three degrees of freedom for the secondary mirror allows us to compensate for these deviations in a closed-loop control manner and ensures optimal positions of the two mirrors at all times. The support structure design requirements are reduced, allowing the utilization of more lightweight structures, as the artificial stiffness of the compensation system takes care of keeping the telescope mirrors in place. Furthermore, the measurement principle requires no light from the telescope, thus providing 100% of the collected light for the observation. The developed actuation and measurement principles are designed for simple scalability to larger representatives of small telescopes. The implemented setup is evaluated in various poses and temperature influences, successfully demonstrating that the calculated Strehl ratio is kept well above the diffraction limit of 80% for the used telescope system.
en
dc.language.iso
en
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dc.publisher
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
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dc.relation.ispartof
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
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dc.subject
Control and Systems Engineering
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dc.subject
Mechanical Engineering
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dc.subject
Electronic, Optical and Magnetic Materials
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dc.subject
Sensors
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dc.subject
Space and Planetary Science
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dc.subject
Instrumentation
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dc.subject
Actuators
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dc.subject
Mirrors
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dc.subject
Telescopes
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dc.subject
Optical instrument design
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dc.subject
Temperature metrology
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dc.subject
Imaging systems
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dc.subject
Astronomy and Astrophysics
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dc.title
Design and Evaluation of an Active Secondary Mirror Positioning System for a Small Telescope
en
dc.type
Artikel
de
dc.type
Article
en
dc.type.category
Original Research Article
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tuw.container.volume
8
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tuw.container.issue
02
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tuw.journal.peerreviewed
true
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tuw.peerreviewed
true
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tuw.researchTopic.id
I8
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tuw.researchTopic.id
C4
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tuw.researchTopic.name
Sensor Systems
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tuw.researchTopic.name
Mathematical and Algorithmic Foundations
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tuw.researchTopic.value
50
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tuw.researchTopic.value
50
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dcterms.isPartOf.title
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS