Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"Spectrographs"”.
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Charged Particle Optics Simulations and Optimizations for Miniature Mass and Energy Spectrometers
… on optimization. The applications shown are mass spectrographs and electron energy spectrographs. Simulation allowed additional information about the systems in question to be determined.In this work, coded apertures are shown to be compatible with sector instruments, though architectural …
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High repetition rate fiber and integrated waveguide femtosecond lasers
… generation or the calibration of astronomical spectrographs, multi-GHz repetition rate femtosecond lasers with robust performance metrics, low cost, and a compact footprint are highly desirable. In this thesis, different approaches to develop GHz mode-locked laser systems at telecommunication …
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Spectroscopic surface brightness fluctuations
… and especially the use of integral field spectrographs furthered our understanding. This work is based on data of NGC 5102 obtained with the panoramic integral field spectrograph MUSE. The data are analysed with two separate and complementary approaches: In the first part, standard methods …
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Molecular Characterisation of Exoplanetary Atmospheres using High-Resolution Transmission Spectroscopy
… the spotlight in recent years, high-resolution spectrographs on large ground-based telescopes are powerful tools with significant scientific potential. However, ground-based observations are complicated and limited by the Earth’s own atmospheric absorption. We here set out to advance …
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MINERVA-RED: A TELESCOPE DEDICATED TO THE DISCOVERY OF NEARBY PLANETS
… and how in the future, single-mode fiber-fed spectrographs may play a key role in the ongoing quest to detect Earth-like planets.
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A spectroscopic and photometric study of stellar populations in a sample of clusters in the Magellanic Clouds
… by using the last generation of imagers and spectrographs. The principal aims of this project are summarized as follows: • The study of the AGB and RGB sequences in a sample of MC clusters, through the analysis of a wide near-infrared photometric database, including 33 Magellanic globulars …
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High resolution Doppler spectroscopy of a transiting ultra-hot Jupiter at optical wavelengths
… from the next generation of high-resolution spectrographs, and may one day be used to characterise habitable planets.
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Applications and noise properties of high repetition rate : TiSapphire frequency combs
… application is the calibration of astronomical spectrographs to enable detection of Earth-like planets which are orbiting Sun-like stars. In support of this application, a second frequency comb system was constructed which ultimately was characterized by a 51 GHz pulse repetition rate and 12 nm …
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Detection and Characterization of Hot Super-Earth Exoplanets
… We find that ground-based high-resolution spectrographs have the best capabilities for detecting the sodium resonance doublet absorption feature in transmission spectra of a sample of hot super-Earths. We identify K2-141 b as the best planetary target for future sodium observations, and …
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Radiation Studies Of The Tin-doped Microscopic Droplet Laser Plasma Light Source Specific To Euv Lithography
… the laser plasma source State of the art EUV spectrographs were employed to observe the source's spectrum under various laser irradiation conditions. Comparing the experimental spectra to those from theory, has allowed the determination of the Sn ion stages responsible for emitting into the …
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Experimental and theoretical investigations of molecular ions by spectroscopy as well as ion mobility and mass spectrometry
… resolutions in the range of commercial echelle spectrographs. The lowest full width at half maximum of a peak achieved was 25 pm. The 2D spectrograph is based on the wavelength separation of light by the combination of a prism and a grating in one dimension, and an etalon in the second …
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Effects of non-commercial thinning on Great Horned Owls on Turnbull National Wildlife Refuge
… stations over 1,107 sessions using Raven Pro 1.5 spectrographs. Although there were more live trees and snags in the Control plots, the diameter at breast height did not differ between treatments. There were more stumps in the 5 year since thinning treatment. I identified only Great Horned Owl …
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Understand thy star, understand thy planet
… future space missions and next generation spectrographs are technically capable at finding and characterising Earth-analogue planets. However, it is now stellar activity that poses a critical challenge on the pathway to detect habitable Earth-like worlds. This thesis is therefore dedicated …
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New insights into primeval galaxies in the era of JWST
… 2022. This work focuses on the low-resolution spectrographs on-board the Gaia satellite. This work, completed before the release of Gaia data release 3, addresses the potential information available in these low-resolution spectra to measure the temperature, surface gravity and metallicity of …
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Characterising Exoplanet Atmospheres with High-Resolution Transmission Spectroscopy
… observations made with the HARPS and HARPS-N spectrographs. Using sodium as a tracer, I report uniformly measured atmospheric properties across the sample, including atmospheric heights, net day-night wind speeds, and sodium doublet line ratios. I report a new detection of sodium in one of the …
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Optical frequency comb generation in optical fibres
… (resolving power > 50000) astronomical spectrographs. The observation of different galaxy structures or the studies of the Milky Way are done using instruments in the low- and medium resolution range. To such instruments belong, for instance, the Multi Unit Spectroscopic Explorer (MUSE) …
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Large groups of quasars in an ultraviolet-excess survey
… to the efficiency of light collection for spectrographs with optical-fibre input is derived and used to show that the efficiency for this survey is > 80 per cent. Survey observations using a multi-object spectrograph with optical-fibre input on the 2.5-m du Pont telescope at the Las …
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Aktive Regionen der Sonnenoberfläche und ihre zeitliche Variation in zweidimensionaler Spektro-Polarimetrie
Die Arbeit beschreibt die Analyse von Beobachtungen zweier Sonnenflecken in zweidimensionaler Spektro-Polarimetrie. Die Daten wurden mit dem Fabry-Pérot-Interferometer der Universität Göttingen am Vakuum-Turm-Teleskop auf Teneriffa erfasst. Von der aktiven Region NOAA 9516 wurde der volle …