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 “"grating spectrometer"”.
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Optical fibre sensors and their interrogation
… and understanding of type IA fibre Bragg gratings, the uses of said gratings as optical sensors and the interrogation of optical sensors using tilted fibre Bragg gratings. This thesis presents the most detailed study of type IA gratings performed to date and provides the basis of a dual …
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X-ray spectroscopy of low-mass X-ray binaries
I present high-resolution X-ray grating spectroscopy of neutron stars in low-mass X-ray binaries (LMXBs) using instruments onboard the Chandra X-ray Observatory and the X-ray Multi-Mirror Mission (XMM-Newton). The first part of this thesis concentrates on results from the subset of LMXBs with …
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Observations from a Long Duration X-Ray Source for Laboratory Astrophysics
… three diagnostics, namely VISAR, SOP and a gated grating spectrometer. The VISAR (velocity interferometry system for any reflector) is an optical laser interferometry diagnostic that measures the speed of a shock launched by the Gatling-Gun x-ray flux in an ablator; in turn, the shock speed …
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On understanding the lives of dead stars : Supernova Remnant N103B, radio pulsar B1951+32, and the Rabbit
Using the Chandra High Energy Transmission Grating Spectrometer, we observed the young Supernova Remnant N103B in the Large Magellanic Cloud as part of the Guaranteed Time Observation program. N103B has a small overall extent and shows substructure on arcsecond spatial scales. The spectrum, based …
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X-ray absorption by the intergalactic medium
… with the Chandra High Energy Transmission Grating Spectrometer (HETGS). While no absorption features were detected, a method of constraining the IGM via the X-ray forest theory was proposed. I also discuss constraining the IGM via the X-ray Gunn-Peterson test.
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Optical Emissions Generated During Ionospheric Heating
… (64.9° N, 146.8° W), a modified Czerny-Turner grating spectrometer acquired high resolution optical spectra of a heated volume. In addition to the already-documented 0(3P) 844.6 nm (excitation energy of 10.99 eV), and 0(5P) 777.4 nm (10.74 eV) emissions, two previously unreported radio-induced …
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Modeling the high resolution X-ray spectra from the relativistic jets of the X-ray binary SS 433
… from the Chandra High Energy Transmission Grating Spectrometer. These observations sample two new orbital/precessional phase combinations. In the observation near orbital phase zero, the H- and He-like Fe lines from both receding and approaching jets are comparably strong and unocculted …
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Pulsed mm-Wave electron cyclotron maser experiments
… (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 identified: in the W-band, single …
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Low Loss Integrated Photonic Devices and Their Applications in Astrophotonics and Quantum Information
… on-chip low-loss (1.39 dB on-chip loss) echelle grating spectrometer that can work in an ultra-broad band (potentially from visible to mid-infrared spectral range) with high resolution and low crosstalk (<-30dB). We demonstrate an on-chip add-drop filter working on arbitrarily spaced five …
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The spectra of manganese and zirconium in the wavelength region 0.8 μm [microns] - 2.6 μm [microns or micrometres]
… tube sources, and a 1.5 m vacuum Ebert mounting spectrometer, the spectrum of manganese in the wavelength region 0.82 - 1.97 μm [microns or micrometres], and additional wavelengths of zirconium weak lines in spectral range of 0.8 - 2.7 μm have been measured. The application of the equipment and …
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Uv-Visible Microscope Spectrophotometric Polarization And Dichroism With Increased Discrimination Power In Forensic Analysis
… upon a sample followed by a non-scanning grating spectrometer equipped with a solid-state multi-element detector. Most of these small modern spectrometers are configured with either silicon based charged-couple device detectors (200-950 nm) or InGaAs based diode array detectors (850-2300 …
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XUV probing of warm dense matter
… 26eV and 31eV. This XUV beam propagated to a grating spectrometer, which allowed the opacity of each sample foil to be measured at multiple photon energies simultaneously. A modelling code was created to simulate the diffraction of the XUV beam around the sample, which allowed both the …
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Studying Accretion Disc Winds with X-ray Spectroscopy
… use of the high-spectral resolution Reflection Grating Spectrometer onboard the XMM-Newton observatory. For efficient data analysis I develop and use systematic automated routines for search of wind signatures in X-ray spectra. The first two chapters of this thesis introduce the theory of …