In this thesis are shown different configurations for a space reflecting telescope realized with the CubeSat standard, whose aim is to observe sun-grazing comets. Firstly it is shown how these near-Sun comets can be observed in the UV spectrum, observing the first line of emission of the Hydrogen that is produced from the ice presents on the surface of these comets. Based on the distances of these comets from the hearth, some parameters for the design of the telescope have been calculated. Then the CubeSat’s background is briefly discussed to understand why the decision to use this technology for the design of the telescope has been taken. The last chapter is dedicated to the structure of the telescope, it is explained the need to use a reflecting telescope. The basic structure and parameters of a telescope are described and the monochromatic aberrations that could affect the images of the telescope are described with the use of the Seidel Sum. The Ritchey-Chrétien configuration of the system is described and the need of an off axis configuration is explained. Then has been made a first order design of the telescope, with the use of paraxial matrices, and then the Spherical and Coma aberrations have been corrected. Two versions of the telescope with slightly different characteristics are proposed. Ultimately, the necessary coating and the filter to reflect the correct wavelength are described.
In questa tesi sono mostrate diverse configurazioni di un telescopio spaziale riflettente che viene realizzato utilizzado lo standard CubeSat, questo telescopio verrà utilizzato per l’osservazione di comete in prossimità del sole. Inizialmente viene mostrato come queste comete possono essere osservate nello spettro dell’ultravioletto, osservando la prima linea di emissione dell’idrogeno che viene prodotto dal ghiaccio presente sulla superficie delle comete. In base alla distanza delle comete dalla terra sono calcolati i parametri principali per il dimensionamento del telescopio. Viene mostrato lo standard CubeSat per spiegare i motivi della decisione di utilizzare questa tecnologia per la realizzazione del telescopio. L’ultimo capitolo viene dedicato alla progettazione del telescopio e viene spiegata la necessità di utilizzare un telescopio in riflessione. La struttura base di un telescopio e i suoi parametri vengono illustrati e vengono descritte attraverso le somme di Seidel le possibili aberrazioni monocromatiche che possono affliggere le immagini del telescopio. Viene descritta la configurazione Ritchey-Chrétien del telescopio e il perché della necessità di utilizzare una configurazione fuori asse del telescopio. Viene poi eseguita un’analisi al primo ordine e viene effettuata la correzione delle aberrazioni sferica e di coma. Vengono proposte due versioni del telescopio con caratteristiche leggermente diverse. Infine, vengono descritti i coating e il filtro necessari per l’osservazione della lunghezza d’onda desiderata.
Reflecting telescope configurations for CubeSat technology
FRANZATO, SILVIA
2023/2024
Abstract
In this thesis are shown different configurations for a space reflecting telescope realized with the CubeSat standard, whose aim is to observe sun-grazing comets. Firstly it is shown how these near-Sun comets can be observed in the UV spectrum, observing the first line of emission of the Hydrogen that is produced from the ice presents on the surface of these comets. Based on the distances of these comets from the hearth, some parameters for the design of the telescope have been calculated. Then the CubeSat’s background is briefly discussed to understand why the decision to use this technology for the design of the telescope has been taken. The last chapter is dedicated to the structure of the telescope, it is explained the need to use a reflecting telescope. The basic structure and parameters of a telescope are described and the monochromatic aberrations that could affect the images of the telescope are described with the use of the Seidel Sum. The Ritchey-Chrétien configuration of the system is described and the need of an off axis configuration is explained. Then has been made a first order design of the telescope, with the use of paraxial matrices, and then the Spherical and Coma aberrations have been corrected. Two versions of the telescope with slightly different characteristics are proposed. Ultimately, the necessary coating and the filter to reflect the correct wavelength are described.File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12608/68813