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.
Results
Showing 1 to 20 of 24 for “"quasi-optical"”.
-
Analysis of Quasi-Optical Components for Far-Infrared Astronomy
… concerned with the development and analysis of quasi-optical components used in experiments to measure of the CMB in the terahertz and submillimetre wavebands. I have concentrated on corrugated horn structures in the Planck and QUBIC experiments. A precise analysis of the electromagnetic and …
-
High efficiency quasi-optical mode converters for overmoded gyrotrons
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1994.
-
The Development of Quasi-Optical Techniques for Log Wavelength Imaging
This thesis concerns the development of quasi-optical techniques for long-wavelength imaging, which was conducted through a combination of experimentation and computer simulation. This work was conducted as part of a SFI-funded research program undertaken by the THz Optics group of the Department …
-
Quasi-Optical Modelling of Telescope Systems for Planck and STEAMR
This thesis is concerned with the high-frequency quasi-optical modelling of telescope systems, with special attention paid to the Planck satellite, but further work is also performed on the Stratosphere-Troposphere Exchange And climate Monitor Radiome- ter (STEAMR) and the Far Infrared Instrument …
-
Quasi-Optical Approaches to the Diffraction and Scattering of Gaussian Beams
Made available in DSpace on 2014-12-10T19:06:30Z (GMT). No. of bitstreams: 1 7105108.pdf: 3612962 bytes, checksum: 1571753387d0860f663108222f61fda6 (MD5) Previous issue date: 1970
-
Quasi-Optical Design and Analysis of Bolometric Interferometers for Cosmic Microwave Background Experiments
The main topic of this thesis is the quasi-optical analysis of optical systems for experiments used to measure the polarisation anisotropies of the cosmic microwave background. The polarisation signal is so low and difficult to measure that very accurate modelling and a deep understanding and …
-
Design and analysis of a quasi-optical beam combiner for the QUBIC CMB interferometer
… QUBIC. In this thesis I propose a design for the quasi-optical combiner that will perform as required.
-
Electromagnetic and Quasi-Optical Analysis of Cavity Coupled Bolometers for Far-Infrared and Terahertz Receivers
… were used to determine the behaviour of the optical relay system. GAMMA was also applied to the multimode 857 and 545 GHz ESA Planck HFI channels. Agreement between previous predictions and both laboratory and in-flight measurements reported in literature was improved on.
-
Quasi-Optical Design and Analysis of a Bolometric Interferometer for Cosmic Microwave Background Radiation Experiments
… involved in the design and analysis of the optical combiner here at the Department of Experimental Physics in Maynooth University. This thesis describes the analysis techniques used for the characterisation of the operation of the QUBIC instrument. These techniques: TE/TM mode matching, …
-
Optical and Quasi-Optical Design and Analysis of Astronomical Instrumentation including a Prototype SAFARI Pixel
The work of this thesis focuses primarily on the quasi-optical analysis of optical systems in the Terahertz region of the spectrum. This included the development of novel simulation techniques based on the principles of mode matching and gaussian beam mode analysis, which are uniquely suited to the …
-
Electromagnetic and Experimental Modeling of Waveguide-Based Spatial Power Combining Systems
… and experimental research in the area of quasi-optical and spatial power combining. The work described here was motivated by the necessity to develop a modeling environment for the electromagnetic analysis of planar quasi-optical and spatial power combining systems, in order to understand …
-
Electromagnetic Analysis of Horn Antennas in the Terahertz region
… available package CST. Where appropriate a quasi-optical approach to the analysis is also applied for comparison and verification of the results, namely Gaussian beam mode analysis. The underlying theory behind these analytical techniques and their implementation is provided along with …
-
A 140 GHz gyro-amplifier using a confocal waveguide : theory and experimental results
… confocal waveguide is presented, along with a quasi-optical approach for describing the modes of a confocal waveguide. Both the equations of motion and the mode excitation equation are derived in detail. A beamlet code is introduced as a tool for calculating the linear and nonlinear gain of the …
-
Broadband, millimeter-wave antireflection coatings for cryogenic sintered aluminum oxide optics
… of thousands of detectors, the days of bespoke quasi-optical coupling elements are drawing to a close. What we will need going forward is a scalable, high-throughput manufacturing process for quasi-optical coatings. That is to say, something like the process detailed in this work. I also address …
-
A Study of miniature methods of terahertz spectroscopy
… as lenses and mirrors designed in the far-field optical regime. A truly miniature terahertz spectroscope would be designed without lenses and mirrors to enable a wide range of inexpensive and pervasive applications in diverse fields such as medicine, materials identification, and security. We …
-
Išorinio poveikio įtaka terahercų taikymams telekomunikacijose /
… technological scenarios (short distances and quasi-optical transmission) was investigated. The results were compared with data from a laboratory-controlled rain experiment. In order to overcome small gain of individual THz Band antennas, very large antenna arrays might be required. The zone …
-
Impact of external effects on terahertz applications for telecommunications /
… technological scenarios (short distances and quasi-optical transmission) was investigated. The results were compared with data from a laboratory-controlled rain experiment. In order to overcome small gain of individual THz Band antennas, very large antenna arrays might be required. The zone …
-
Design and Analysis of Corrugated Conical Horn Antennas with Terahertz Applications
… as free-space radiators or as part of a larger quasi-optical network. The main analysis tools used in this work were the in-house mode-matching code, SCATTER, and the commercially available CST: Microwave Studio, which makes use of the finite integration technique. A version of SCATTER which …
-
Design and Analysis of the Optical Beam Combiner and Corrugated Feed Horns for the QUBIC Instrument
… Argentina. This thesis describes the detailed optical analysis of the QUBIC instrument and, in particular, its quasi-optical beam combiner. Two variations of QUBIC are analysed: the full instrument (FI) and a technological demonstrator (TD). It was decided to develop the smaller optical …
-
Pulsed mm-Wave electron cyclotron maser experiments
… calibrated frequency measurements (made using a quasi-optical diffraction grating spectrometer), 3) near field radiation pattern measurements and 4) calibrated absolute power measurements (made using a thermopile calorimeter). The following characteristics of the maser oscillation were …
Page 1 of 2