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 15 of 15 for “"Infrared astronomy"”.
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Analysis of Quasi-Optical Components for Far-Infrared Astronomy
This thesis is 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 …
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Electromagnetic Techniques for Analysis and Design of Ultra Sensitive Receivers for Far-Infrared Astronomy
… of receivers and detectors for far-IR (far-infrared) astronomy and CMB (cosmic microwave background) applications, toward an optimum design for SAFARI (the Spica Far-Infrared Instrument) on the proposed space based telescope SPICA (Space Infrared Telescope for Cosmology and Astrophysics). …
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Investigating spatial variation in the surface and atmosphere of Pluto through stellar occultations and PSF photometry
… camera aboard the Stratospheric Observatory For Infrared Astronomy (SOFIA). Differential photometry was found to be reliable to one part in 104. The second project is a modern determination of the light ratio of Charon and Pluto, essential for predicting future occultations. The final project …
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Spatial Nyquist fidelity method for structural models of opto-mechanical systems
… Telescope, and the Stratospheric Observatory for Infrared Astronomy.
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Towards Integrated Pixel Modelling
… cavity, and absorber) structures of future far-infrared instruments. Contemporary waveguide technologies increasingly rely on the exploitation of multi-moded behaviour and operation in higher frequency bands. In these scenarios a more comprehensive approach is required to correctly predict their …
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Design and Development of Planar Antennas and Dielectric Devices for use at W Band Frequencies
… Horn Antennas for CMB Experiments and Far-Infrared Astronomy”. The development of W band focal plane pixels (planar antenna with small lenses) was part of the research in this work package. Several planar antenna designs are modelled and optimised in CST Studio Microwave Suite, a …
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Estimation of astronomical images from the bispectrum of atmospherically distorted infrared data.
… for recovering the images of one-dimensional infrared astronomical speckle data are examined in detail. An analytic model for the bispectral transfer function, the variance, and the covariance of the bispectrum are developed. The models are evaluated by Monte Carlo integration and the results …
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Transition Edge Sensors for Far-Infrared Space Science
… technology for the next generation of far-infrared space observatories. Future missions will seek to achieve unprecedented background-limited sensitivities by combining large (>1 m) cold (<4 K) aperture telescopes with many thousands of detectors having Noise Equivalent Power (NEP) of only …
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Observational Insights into White Dwarf Planetary Systems
… producing dusty debris detectable as excess infrared emission, and then subsequently accrete onto the white dwarf. The scattering and accretion are expected to be stochastic processes with variability predicted on human time-scales. Chapter 2 reports near-infrared (JHK) monitoring campaigns …
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A 3-dimensional analysis of the Cassiopeia a supernova remnant.
… goals, we used the Spitzer Space Telescope’s Infrared Spectrograph to create a high resolution spectral map of select regions of Cas A, allowing us to make a Doppler reconstruction of its 3-dimensional structure structure. In the center of the remnant, we find relatively pristine ejecta that …