Дисертації з теми "Telescopic lens"
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Atkinson, Joseph Logan. "Through the telescopic lens of literature, social life and the reform of English quarantine law, 1665-1722." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/mq26898.pdf.
Повний текст джерелаAtkinson, Joseph Logan Carleton University Dissertation Law. "Through the telescopic lens of literature; social life and the reform of English quarantine law 1665-1722." Ottawa, 1997.
Знайти повний текст джерелаЧорний, Владислав Олександрович. "Лазерний вимірювач швидкості кровотоку". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/43661.
Повний текст джерелаThe volume of the report is 56 pages, contains 25 illustrations, 17 tables. In general, 22 sources were processed. Relevance: control and rapid assessment of the characteristics of blood flow parameters is an important attribute of proper diagnosis of the patient, and in particular a non-invasive method of measurement, as the perception of a foreign body can lead to unpleasant consequences. Purpose: inexpensive and reliable laser blood flow meter, both for laboratory experiments and for daily monitoring of the patient. Task: 1. Review and analysis of the literature related to laser blood flow meters. 2. Review and analysis of intellectual property of modern laser blood flow meters. 3. Construction of the optical-functional scheme of the device. 4. Selection of elements to the optical-functional scheme of the flowmeter. 5. Simulation of a laser blood flow meter.
Álvarez, Pastor José Manuel. "Focal plane detectors of a Laue lens telescope for Nuclear Astrophysics." Doctoral thesis, Universitat Autònoma de Barcelona, 2012. http://hdl.handle.net/10803/83940.
Повний текст джерелаfew MeV) has an extraordinary potential for understanding the evolving and violent Universe. In spite of the strong efforts accomplished by past and current instruments, in order to perform observations in this energy range, an improvement in sensitivity over present technologies is needed to take full advantage of the scientific potential contained in this energy range. In order to achieve higher sensitivities, γ-ray astronomy has been looking over the last decades for new ways to increase the efficiency of its instruments while reducing the background noise. With the objective of reducing or avoiding as much background as possible (through shielding mechanisms and data analysis techniques), a strong effort in innovation and design (build-up of prototypes and numerical simulations studies) is being conducted by a community facing the challenge of preparing the next generation of γ-ray telescopes. In particular, the progress achieved during the last decade on focusing optics based on Laue lenses is especially remarkable. Conceptually, a focusing telescope will reduce drastically the background noise by concentrating γ-rays onto a small size detector. Focusing γ-rays with a Laue lens is not just a theoretical concept, but a reality, mainly thanks to the development of a first prototype of Laue lens for nuclear astrophysics accomplished as part of the CLAIRE project. Moreover, the development of focusing optics during these years has also encouraged the development of new detector technologies. The focal plane detector of a focusing telescope should provide imaging capabilities, perform high-resolution spectroscopy and measure the polarization of the incident photons in order to achieve the ambitious scientific goals. The research presented in this thesis covers both main areas of a γ-rays telescope: focusing optics and focal plane detector. As far as the optics is concerned, a test of the lens CLAIRE was performed in order to confirm the principles of a Laue diffraction lens. Concerning the focal plane detector, theoretical and experimental studies with new detector technologies have been carried out. Our main research has evolved in the framework of two mission concept studies -GRI (2007) and DUAL (2010)- submitted to the ESA Calls for a Medium-size mission opportunity within the Cosmic Vision 2015-2025 program. As far as the GRI mission is concerned, a focal plane detector configuration based on Cd(Zn)Te pixelated detectors is proposed, whilst development and testing of a detector prototype is accomplished. It is noteworthy that the detector configuration was successfully registered under a European Patent and is being considered for applications in the field of nuclear medicine. Regarding the DUAL mission, simulations of the expected space radiation environment and the resulting detector activation were carried out in order to estimate the performances of the all-sky Compton telescope of DUAL (based on Germanium-strip detectors). The results show that DUAL could achieve, after two years of operation, a continuum sensitivity one order of magnitude better than any past and current observatory in the MeV energy range and up to a factor 30 of improvement with its Laue lens. Beyond the detector technology proposed for GRI and DUAL, a wide variety of technologies could be explored for the focal plane of a γ-ray lens mission as well as for a stand-alone detector. In this thesis a focal plane detector based on liquid xenon is also considered. This work faces the challenges of the next generation of γ-ray telescopes, where high performance γ-ray detectors are necessary to achieve the required sensitivity in order to answer several hot scientific topics of Gamma-ray astrophysics in the energy range of nuclear transitions.
Le, Breton Rémy. "Large synoptic survey telescope : distorsions électrostatiques dans les ccd." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066298/document.
Повний текст джерелаThe removal of the sensor signature in the science images has been identified by the LSST Dark Energy Science Collaboration as a mandatory path to fullfill its scientific goals. The SAWG working group has been put together to perform this task for the collaboration. It has access to optical benches in some of the laboratories of the collaboration (UC Davis, SLAC, BNL and LPNHE) for this purpose. LSST belongs to a new category of telescopes equiped with large focal planes. For the decade that they have been equipped with thick, high resistivity Charge Coupled Devices (CCD), new effects have been identified. A particular attention is given to the understanding of the electrostatic distortions that are inherent to the CCD properties. These electrostatic distortions have an impact on science measurements. My PhD work is centered on the study of the brighter-fatter effect and the tree-rings. It has been shown that with different kind of illuminations, it was possible to accurately characterize these effects. A fringe projector has been developed on the optical bench of the LPNHE in order to produce these particular illuminations. In this document, we present : a new method, tested on simulations, to characterize the tree-rings; a new method to measure the brighter-fatter effect based on the projection of Ronchi profiles; a complete study of the different properties of the brighter-fatter effect, where we developped a simplified electrostatic model. Finally, the efficiency of a correction method, called descrambling, is evaluated
Le, Louarn Miska. "Etoiles laser pour les grands telescopes: effet de cone et implications astrophysiques." Phd thesis, Université Claude Bernard - Lyon I, 2000. http://tel.archives-ouvertes.fr/tel-00004236.
Повний текст джерелаMuller, Nicolas. "Analyse de front d'onde sur étoiles laser pour les extremely large telescopes." Paris 7, 2011. http://www.theses.fr/2011PA077144.
Повний текст джерелаIn order to increase the sky coverage in Adaptive Optics (AO), Laser Guide Stars (LOS) are created in the Sodium layer of the atmosphere. These 3D extended objects induce specific problems on the wave front measurement performed by the Wave Front Sensor (WFS). Some of these problems become critical on the Extremely Large Telescopes (ELTs). The goal of this work is to study the specificity of the wavefront analysis on LGS in the framework of the ELTs, and to optimize the WFS measurement accuracy on such objects. We first studied the characterization of the effects of differential focal anisoplanatism on wave front measurements. Using a diffractive propagation model,i. E. Taking into account the effects of phase and amplitude, we have calculated these effects in the case of ELTs. Considering the stage of tomographic phase reconstruction. We have shown that these effects are actually low in amplitude for most applications. We proposed then a simple model to classify the different sources of errors identified in the literature. After showing that the Pyramid WFS and the Shack-Hartmann (SH) had very similar behaviours with regards to these effects, we assessed the différent error terms in the decomposition, considering the case of a SH WFS. We studied in detail the evaluation of the non-linearity error and the sensor noise error. Then we evaluated the impact of the Sodium layer variations, considering analytical profiles as well as real data. We considered also here the stage of tomographic reconstruction. Finally, we managed to deduce from this study the parameters of the WFS to be favored when optimizing the wavefront analysis on LGS, in the case of ELTs
Spilker, J. S., D. P. Marrone, M. Aravena, M. Béthermin, M. S. Bothwell, J. E. Carlstrom, S. C. Chapman, et al. "ALMA IMAGING AND GRAVITATIONAL LENS MODELS OF SOUTH POLE TELESCOPE—SELECTED DUSTY, STAR-FORMING GALAXIES AT HIGH REDSHIFTS." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621394.
Повний текст джерелаBellini, Luciano Porto. "Estudo comparativo entre o telescópio com lente de contato e o telescópio convencional em pacientes com baixa visão." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/17787.
Повний текст джерелаPurpose: To compare the conventional telescope (CT) with the contact lens telescope (CLT) in patients with age-related macular degeneration (AMD) and low-vision, with respect to visual acuity (VA), visual field (VF), patient satisfaction with the vision provided by the telescope (VS), telescope use difficulties (UD) and patient satisfaction with the cosmetic appearance of the telescope (CS). Methods: In a masked randomized clinical trial, 12 patients with AMD and low-vision were enrolled in 2 groups with 6 patients each: group 1 (CLT use) and group 2. (CT use) The telescopes used in this study were standardized to have the same magnification power. (2.8x) Visual field and VA were obtained before and during the telescope use, while VS, UD and CS were obtained after the telescope use. Results: There were no significant differences between groups at baseline. Both groups achieved VA improvement with telescopes compared to baseline (P=0.002 in CLT group and P<0.001 in CT group) and there were no significant differences between groups in this regard. Visual field was reduced by 15° in CLT group (P<0.001) and by 54.3° in CT group (P<0.001) compared to baseline, and VF differences between groups were also significant during telescope use. (P<0.001) Scores observed in both groups were similar in regard to VS. Telescope use difficulties were significant higher in CLT group (P=0.003) as well as CS scores (P<0.001) compared to CT group. Conclusions: Both telescopes provide similar improvement in VA in AMD patients with low-vision, but CLT caused less VF reduction than CT use. Patient satisfaction with the cosmetic appearance of the telescope was higher in CLT group, but UD was also higher in this group compared to CT group.
Pollard, Lloyd Wayne 1936. "Design of a flexure mount for optics in dynamic and cryogenic environments." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276741.
Повний текст джерелаMalacrino, Frederic. "RECHERCHE SYSTEMATIQUE DE CONTREPARTIESOPTIQUES DE SURSAUTS GAMMADANS LES IMAGES DU "VERY WIDE SURVEY"DU TELESCOPE CANADA-FRANCE-HAWAII." Phd thesis, Université Paul Sabatier - Toulouse III, 2006. http://tel.archives-ouvertes.fr/tel-00135769.
Повний текст джерелаLes modèles théoriques de sursauts gamma prédisent la présence d'une focalisation de l'émission gamma. L'observation de cassures dans un grand nombre de courbes de lumière d'afterglows optiques, conséquence attendue de cette focalisation, a permis de confirmer cette hypothèse. L'afterglow émettant dans un cône qui s'élargit avec le temps, il en découle l'existence d'afterglows qui ne sont pas associés à un sursaut gamma visible. Ceux-ci sont appelés afterglows orphelins. La recherche d'afterglows orphelins est un enjeu crucial pour la compréhension des sursauts gamma. Leur détection permettra en effet l'étude des sursauts proches et des sursauts sans émission gamma, et constituera un excellent moyen pour tester l'hypothèse de focalisation de l'émission gamma. Les quelques recherches d'afterglows optiques qui ont été effectuées jusqu'alors se sont toutes révélées infructueuses, puisque aucun afterglow n'a été identifié.
Dans cette étude, je présente une nouvelle recherche d'afterglows optiques. Elle s'effectue dans les images d'une stratégie d'observation ayant lieu au Télescope Canada-France-Hawaii, nommée le Very Wide Survey. Elle prévoit de couvrir 1200 degrés carrés du ciel jusqu'à la magnitude r' = 22,5. Chaque champ est observé plusieurs fois, avec des intervalles de temps de l'ordre de l'heure et de la journée. Afin de traiter les images du Very Wide Survey, j'ai développé et mis en place un système d'analyse en temps réel, nommé "Optically Selected GRB Afterglows". Ce système, entièrement automatisé, crée dans un premier temps des catalogues d'objets à partir des images, puis dans un second temps compare entre eux les catalogues d'un même champ acquis à des instants différents, afin d'extraire les objets variables en luminosité, et ceux qui sont apparus ou ont disparu. Ces objets sont ensuite affichés sur une page Web où ils peuvent être validés comme candidat afterglow par un membre de la collaboration.
Les statistiques effectuées sur les catalogues et sur les comparaisons montrent que ce système de recherche est très performant. Plus de 99,5% des images sont traitées sans encombre et rapidement, nous permettant d'envoyer des alertes à la communauté des sursauts en moins de
24 heures. Les objets détectés variables représentent moins de 0,01% des objets. Environ 10% d'entre eux sont de véritables objets variables qu'il nous faut séparer manuellement des fausses détections. Durant ma thèse, j'ai également développé un programme de simulation d'afterglows qui permet d'évaluer l'efficacité d'une stratégie d'observation et de calculer un nombre d'afterglows attendus suivant un modèle de sursaut donné. Les résultats des simulations montrent que notre recherche d'afterglows est de loin la plus performante ayant jamais été effectuée. Dans l'intégralité des images du Very Wide Survey, nous attendons entre 4 et 5 détections d'afterglows. Pour l'instant, notre recherche en temps réel n'a pas abouti à l'identification d'un afterglow optique avec certitude. Nous sommes néanmoins capables de proposer des contraintes sur le rapport du nombre d'afterglows sur le nombre de sursauts. La valeur supérieure limite que nous obtenons est de 12,6 afterglows par sursaut gamma, jusqu'à la magnitude 22,5 et avec 90% de confiance.
Farnier, Christian. "Complémentarité de recherche de matière noire dans les galaxies naines sphéroïdes avec les expériences H. E. S. S. Et Fermi-LAT." Montpellier 2, 2009. http://www.theses.fr/2009MON20267.
Повний текст джерелаIn the actual cosmological model, the Universe is predominantly composed of dark matter which nature remains unexplained by the Standard Model of particle physic. Annihilation of particles of new theoretical frameworks might induce a very high energy gamma-ray signal, observable by gamma-ray astronomy experiments. Widely dark matter dominated, dwarf spheroidal galaxies are privileged targets for such indirect search. The H. E. S. S. Telescopes network discussed in the first part is a perfect example of atmospheric stereoscopic imaging experiment allowing to search for dark matter. A new discrimination method of electromagnetic and hadronic showers enhancing searches of weak sources is presented. It is applied on the Sagittarius dwarf galaxy observation data and the upper limit on the incoming gamma-ray flux is calculated. In orbit aboard Fermi's satellite since June 2008, the LAT conversion pair telecope enable dark matter search on the whole sky. Theoretical sensitivity to detect a dark matter signal is determined for two specific galaxies. At the end of the first year of observations, upper limits on gamma-ray fluxes are derived for a catalog of dwarf spheroidal galaxies. Models of physic beyond the Standard Model are compared with calculated constraints on annihilation cross sections function of the mass paricles obtained from observations made with both experiments
MIROSLAV, Denis. "Analyse temporelle du rayonnement x et gamma (30 kev-1,3 mev) emis par les sources galactiques observees par le telescope spatial sigma." Toulouse 3, 1993. http://www.theses.fr/1993TOU30089.
Повний текст джерелаGuy, Thomas. "Gestion diagrammatique des connaissances sur les lignées techniques de télescopes." Thesis, université Paris-Saclay, 2020. https://tel.archives-ouvertes.fr/tel-02932351.
Повний текст джерелаCentral device of astronomy, the telescope is also one of the very first scientific instruments. We propose to deliver an innovative analysis based on genetic mechanology. This method of analyzing the structures and the evolutions of technical objects is inspired by the work of Jacques Lafitte and Gilbert Simondon. In particular, this involves identifying the appearance of new technical schemes and relating them to the technical lineage to which they belong. In this context, we develop several concepts and tools to extract, formalize and enrich the knowledge about inventions that have emerged during the concretization process of telescope technical lineages. The collected information is not passive archived data : its formalization through diagrams must turn them into technological knowledge, which clarifies the operation of the instrument and allow to trace its genealogy. By analyzing the design processes, as well as the competition between the different lineages of telescopes, we achieve a better understanding of the technical evolution patterns underlying the development of these instruments and are able to formulate very general technical trends. Those latters are accompanied, in the case of telescopes, by evolutionary patterns resulting from external performance imperatives as well as from internal technical necessities. The explanation of these patterns, as well as the emerging processes to which they give rise, make it possible to understand the long time dynamics and anticipate difficulties for future missions. Thus, our approach is neither normative nor positive: through a constant dialectic between the formulation of our « laws of evolution » and the historical data, we exhibit, with a certain objectivity, some regularities in the evolution of telescopes, in a historical perspective that is both retrospective and prospective
Laslandes, Marie. "Miroirs actifs de l’espace : Développement de systèmes d’optique active pour les futurs grands observatoires." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4774/document.
Повний текст джерелаThe need for both high quality images and light structures is one of the main driver in the conception of space telescopes. An efficient wave-front control will then become mandatory in the future large observatories, ensuring the optical performance while relaxing the specifications on the global system stability. Consisting in controlling the mirror deformation, active optics techniques can be used to compensate for primary mirror deformation, to allow the use of reconfigurable instruments or to manufacture aspherical mirror with stress polishing. In this manuscript, the conception of active mirrors dedicated to space instrumentation is presented. Firstly, a system compensating for large lightweight mirror deformation in space, is designed and its performance are experimentally demonstrated. With 24 actuators, the MADRAS mirror (Mirror Actively Deformed and Regulated for Applications in Space) will perform an efficient wave-front correction in the telescope's pupil relay. Secondly, a warping harness for the stress polishing of the 39 m European Extremely Large Telescope segments is presented. The performance of the process is predicted and optimized with Finite Element Analysis and the segments mass production is considered. Thirdly, two original concepts of deformable mirrors with a minimum number of actuators have been developed. The Variable Off-Axis parabola (VOALA) is a 3-actuators system and the Correcting Optimized Mirror with a Single Actuator (COMSA) is a 1-actuator system
Lefaucheur, Julien. "Astronomie gamma depuis le sol et l'espace : premières analyses du réseau hybride HESS-II et recherche de candidats blazars parmi les sources non identifiées du Fermi-LAT." Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCC093.
Повний текст джерелаThis manuscript is about high energy -γ-ray astronomy (between GeV and GeV) with the Fermi-LAT satellite and very high energy astronomy above ~GeV) via the H. E. S. S. Experiment. The second phase of the H. E. S. S. Experiment began in July 2012 with the inauguration of a fifth 28 m diameter telescope added to the intial array composed of four 12m diameter imaging atmospheric Cherenkov telescopes. In the first part of this thesis, we present the development of an analysis in hybrid mode based on a multivariate method dedicated to detect and study sources with different spectral shapes and the first analysis results on real data. The second part is dedicated to the research of blazar candidates among the Fermi-LAT unidentified sources of the 2FGL catalog. A first development is based on a multivariate approach using discriminant parameters built with the 2FGL catalog parameters. A second development is done with the use of the WISE satellite catalog and a non-parametric technic in order to find the blazar-like infrared counterparts of the unidentified sources of the 2FGL catalog
Sadibekova, Tatiana. "CONTRIBUTION À L'ÉTUDE DES SITES ASTRONOMIQUES PAR MODÉLISATION ET EXPÉRIMENTATION in situ : APPLICATION AUX SITES DE LA SILLA ET DU DÔME C POUR LES TELESCOPES GÉANTS DU FUTUR." Phd thesis, Université de Nice Sophia-Antipolis, 2007. http://tel.archives-ouvertes.fr/tel-00271689.
Повний текст джерелаL'etude de Dome C met en evidence des conditions tres particulieres (s echeresse, froid, peu de vent) qui permettent d'envisager, meme de jour, certaines observations stellaires dans des fenetres spectrales de l'infrarouge thermique qui sont inaccessibles partout ailleurs sur Terre. Pendant l'ete austral le seeing moyen est meilleur que dans les autres sites connus. Pendant l'hiver il est degrade par la presence de la couche limite qui contient parfois jusqu'a 90% de la turbulence atmospherique dans la premiere trentaine de metres. Ceci est confirme par les mesures in situ et les resultats de re-analyses. Pour la suite, il est tres important de connaitre la distribution verticale de la turbulence qu'on obtient grace aux differentes techniques de profilage atmospherique par les mesures et par la modelisation. C'est pourquoi ici, on procede a la validation comparative du modele meteorologique europeen ECMWF(European Center for Medium-range Weather Forecasts) pour Dome C qui pourra fournir les parametres d'entree pour les divers modeles de turbulence qui de leur cote permettront d'obtenir la distribution verticale de Cn2(h) et par la suite la prevision du seeing a court et long terme.
Dans le cadre general de la recherche des meilleurs sites pour le futur telescope europeen E-ELT, une campagne de mesures a ete effectuee en 2002/2003 a l'observatoire de La Silla de l'ESO au Chili au moyen d'un profileur a etoile double - le SCIDAR Generalise. On a obtenu, apres 5 mois d'observation, la statistique pour le seeing, l'angle isoplanetique, le temps de coherence et les profils verticaux de Cn2(h) et V(h). Ceci a permis de decouvrir plusieurs particularites importantes de ce site astronomique. Les valeurs du seeing ont ete comparees a celles mesurees par l'instrument DIMM. Les resultats de cette campagne sont tres importants pour decrire la situation turbulente au-dessus de ce site et ils sont egalement n ecessaires pour proceder a la simulation des systemes d'optique adaptative afin de determiner les limites observationnelles des futurs grands telescopes et specialement pour l'optique adaptative.
Coppolani, Franck. "Recherche systématique de quasars dans les grands sondages du ciel et application à l'étude de corrélation dans le milieu intergalactique." Paris 6, 2006. http://www.theses.fr/2006PA066351.
Повний текст джерелаRobinson, Matthew. "Development of planar technology for focal planes of future radio to sub-millimetre astronomical instruments." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/development-of-planar-technology-for-focal-planes-of-future-radio-to-submillimetre-astronomical-instruments(dd2876aa-ff1a-4ae7-903f-a8228f3fc85f).html.
Повний текст джерелаFeliachi, Rym. "Traitement spatial des interférences cyclostationnaires pour les radiotélescopes à réseau d'antennes phasé." Phd thesis, Université d'Orléans, 2010. http://tel.archives-ouvertes.fr/tel-00578950.
Повний текст джерелаTavernier, Thomas. "Une quête de l'émission du pulsar de Vela aux hautes et très hautes énergies : observation, détection et étude, du GeV et TeV (GeV) avec le satellite Fermi et les télescopes à imagerie Tcherenkov H.E.S.S." Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCC257.
Повний текст джерелаThe thesis presented in this manuscript is devoted to the study of bright pulsars shilling in -y-rays, at energies ranging from 100 MeV to several TeV. It is based on data from the LAT instrument aboard the Fermi satellite, as well as those obtained with the ground-based system of Cherenkov telescopes, H. E. S. S. , * installed in Namibia. The phased-resolved spectral measurements of pulsars with the Fermi-LAT, and in particular that of Vela (PSR B0835-45) constitutes the first step of this work. The development of an analysis method dedicated to the fifth and the largest H. E. S. S. Telescope has enabled us to detect the pulsed emission of PSR B0835-44 from ground, starting as low as 10 GeV on, and then to measure its spectrum. The very good agreement with the results obtained from the LAT data demonstrates the validity of the numerical model of the telescope and of the methodology. This is the first pulsar detected by H. E. S. S. , and the lowest energy threshold reached in Cherenkov astronomy as of today. In a third step, the analysis of data obtained on Vela with all H. E. S. S. Telescopes has resulted in an indication of a pulsed signal in the TeV range from PSR B0835-45, at a good level of confidence (4. 5 standard deviations). The spectral evaluation shows that this signal, if confirmed, represents a second component. A quick and simple study shows that this component could result from inverse Compton scattering of leptons in the pulsar wind, accelerated to ultra-relativistic energies beyond the light cylinder, on neutron star's thermal X-ray photons. These results open the perspectives for pulsar physics at tens of GeV and especially above TeV energies with the future CTA observatory
Sanchez, David. "Étude et modélisation des noyaux actifs de galaxie les plus énergétiques avec le satellite Fermi." Phd thesis, Ecole Polytechnique X, 2010. http://pastel.archives-ouvertes.fr/pastel-00521741.
Повний текст джерелаTing, cheng-Hsu, and 鄭勗廷. "plastic lens and plastic telescope." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/94958766808217879093.
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