EnVisS (Entire Visible Sky) is an all-sky camera designed to fly on Comet Interceptor, the first European Space Agency (ESA) Fast mission. The aim of this mission is to increase our knowledge on comets by encountering and exploring a truly pristine comet or an interstellar object originating at another star. EnVisS’s scientific task is to image, in push-frame mode, the whole comet coma in the visible range. One of the main components of EnVisS is the filter strip assembly (FSA), a key element to be realized, which aims to measure the radiance and the polarization properties of the comet’s coma diffused light. The current design (developed by CNR-IFN and Leonardo SpA) consists of three filter strips glued side by side: one central high transmission broadband (BB) filter and two lateral linear polarization filters. Object of this thesis work is the study and the preliminary characterization of this filter assembly. In the CNR-IFN laboratories in Padua (Italy) different types of polarizing filters have been tested to establish which one has the most fitting properties for EnVisS’s purposes. The analyzed filters are Moxtek visible light polarizer RCV8N2EC and ultra broadband UBB01A, and Polarcor Wide Band polarizer. In addition, the FSA has been simulated with a Finite Element Analysis software Patran-Nastran. The purpose of this analysis is to learn if the optical components of the filter package are prone to structural changes, whenever they are subjected to external loads and to the non-planarity of the mechanical interface between the support structure and the FSA.
EnVisS (Entire Visible Sky) è una telecamera all-sky progettata ad-hoc per la prima missione Fast dell'Agenzia Spaziale Europea (ESA), Comet Interceptor. Lo scopo di questa missione è ampliare la conoscenza sulle comete tramite l'esplorazione e l'incontro ravvicinato di una cometa incontaminata o di un corpo interstellare. L'obiettivo scientifico di EnVisS è quello di mappare e studiare l'intera chioma della cometa nel intervallo di lunghezza d'onda del visibile. Uno dei componenti principali di EnVisS è il filter strip assembly (FSA), che consentirà di misurare la radianza e le proprietà di polarizzazione della luce diffusa della chioma della cometa. L'attuale progetto (sviluppato da CNR-IFN e Leonardo SpA) del FSA consiste in tre strisce filtranti incollate uno accanto all'altra: un filtro centrale a banda larga e ad alta trasmissione (BB) e due filtri laterali per la polarizzazione lineare. Oggetto di questo lavoro di tesi è lo studio e la caratterizzazione preliminare del filter strip assembly. Nei laboratori CNR-IFN di Padova (Italia) sono stati testati diversi tipi di filtri polarizzatori per stabilire quale tra questi ha le proprietà più adatte agli scopi di EnVisS. I filtri polarizzatori analizzati sono: RCV8N2EC, ottimizzati per il visibile, UBB01A (ultra broadband) a larga banda, entrambi prodotti dalla ditta Moxtek, e Wide Band prodotto da Polarcor. Inoltre, il FSA è stato simulato con un software di analisi agli elementi finiti Patran-Nastran. Lo scopo di questa simulazione è determinare se i componenti ottici del filter assembly siano soggetti a cambiamenti strutturali, quando sono sottoposti a carichi esterni e alla non planarità dell'interfaccia meccanica tra la struttura di supporto e il FSA.
Study and characterization of the filter strip assembly of the EnVisS camera for the Comet Interceptor mission
NALETTO, CARMEN
2022/2023
Abstract
EnVisS (Entire Visible Sky) is an all-sky camera designed to fly on Comet Interceptor, the first European Space Agency (ESA) Fast mission. The aim of this mission is to increase our knowledge on comets by encountering and exploring a truly pristine comet or an interstellar object originating at another star. EnVisS’s scientific task is to image, in push-frame mode, the whole comet coma in the visible range. One of the main components of EnVisS is the filter strip assembly (FSA), a key element to be realized, which aims to measure the radiance and the polarization properties of the comet’s coma diffused light. The current design (developed by CNR-IFN and Leonardo SpA) consists of three filter strips glued side by side: one central high transmission broadband (BB) filter and two lateral linear polarization filters. Object of this thesis work is the study and the preliminary characterization of this filter assembly. In the CNR-IFN laboratories in Padua (Italy) different types of polarizing filters have been tested to establish which one has the most fitting properties for EnVisS’s purposes. The analyzed filters are Moxtek visible light polarizer RCV8N2EC and ultra broadband UBB01A, and Polarcor Wide Band polarizer. In addition, the FSA has been simulated with a Finite Element Analysis software Patran-Nastran. The purpose of this analysis is to learn if the optical components of the filter package are prone to structural changes, whenever they are subjected to external loads and to the non-planarity of the mechanical interface between the support structure and the FSA.File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.12608/47865