Byrne, David
(2021)
Design and Analysis of
Quasioptical Components for use
in Terahertz Optics and Future
CMB Missions.
Masters thesis, National University of Ireland Maynooth.
Abstract
The main topic of this thesis concerns itself with the development and analysis
of optical components used in CMB (Cosmic Microwave Background) missions
in the terahertz frequency spectrum. In particular, the optical performance of
PRISTINE, a mission proposal for the ESA fast (F) mission call and a PLA
(Polylatic Acid) GRIN (Gradient Index) lens was analysed using GBM (Gaussian
Beam Mode) theory and PO (Physical Optics). This thesis also includes the work
the author did as part of an international team of 16 students to design a candidate
ESA mission. The final chapter, therefore, concerns itself with “Geophysics from
Space using Micro-or Nano-Satellite Constellations” and is separate from the rest
of the thesis.
Detailed analysis of PRISTINE was carried out in GRASP 10.5 a commercial
package which uses PTD (Physical Theory of Diffraction ) and PO to measure
the EM (Electromagnetic ) radiation generated from reflector antennas. The EM
fields predicted from GRASP were compared with GBMA (Gaussian Beam Mode
Analysis). The beam quality of PRISTINE was tested using its Gaussicity and
ellipticity (this was the chosen method used to compare the simulated data with
the theoretically predicted data). Each surface of PRISITNE’s twelve mirror pFTS
(polarising Fourier Transform Spectrometer) was designed using code written by
the author to optimise the focusing and collimation of each elliptical surface from
criteria outlined in Chapter 3.
Chapter 4 deals with the design, manufacturing and analysis of a 3-D printed PLA
GRIN lens designed to focus W-band radiation (75-110 GHz) 250 mm from the
lens. For this, a commercial package known as CST microwave was used to analyse
the refracted radiation. The simulated radiation was also compared with GBM
analysis and the experimental lab data performed in Maynooth University’s VNA
(Vector Network Analyser) laboratory. Along with this, some material analysis
was performed at 100 GHz in the laboratory to determine the permittivity of the
PLA. The final section of this thesis moves away from quasi-optical analysis and
instead concerns itself with Geophysics. MAGMA-C is a proposed eight satellite
constellation in a Low Earth Orbit (LEO) to measure the Earth’s magnetic field to
study the induced magnetic field in the mantle. The primary goal of the MAGMA�C mission is to map Earth’s mantle conductivity derived from its induced magnetic
field. The secondary goal of this mission is to use this conductivity profile to better
estimate the water content of the mantle.
Item Type: |
Thesis
(Masters)
|
Keywords: |
Design and Analysis; Quasioptical Components; Terahertz Optics; CMB Missions; |
Academic Unit: |
Faculty of Science and Engineering > Experimental Physics |
Item ID: |
14918 |
Depositing User: |
IR eTheses
|
Date Deposited: |
13 Oct 2021 10:59 |
URI: |
|
Use Licence: |
This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available
here |
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