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 154 for “"Interferometers"”.
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Interaction effects in quantum interferometers
… is to investigate the effects of interactions in interferometers in the integer quantum Hall regime. The behaviour of electrons in condensed matter systems is mostly determined by the repulsive Coulomb interaction. However, under special circumstances the Coulomb interaction can be effectively …
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Quadrature-point stabilization of Mach-Zehnder interferometers
Optical fiber magnetometers are extremely sensitive devices which are capable of competing with magnetometers implemented using other technologies. Demodulation of the signals detected using these magnetometers can be performed using either homodyne or heterodyne techniques. Higher sensitivities …
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Nonlinear Interferometers for Quantum Information Processing and Metrology
The ability to generate biphoton state with tunable properties in various degrees of freedom (DoFs) is always a challenging task in the field of quantum information processing. This arises from the fact that generating such biphoton state puts many constrains on the design and fabrication of the …
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Plasma Electron Density Measurement Using Homodyne and Heterodyne Interferometers
Measurement of the electron density in a plasma using interferometry. Two different interferometer designs, homodyne and heterodyne are studied in two fusion reactor systems namely Tokamak and flow through Z-pinch device.
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Investigating the Epoch of Cosmic Reionisation with Radio Interferometers
… a prime objective of modern low-frequency radio interferometers, though instrumental systematics and calibration errors pose an immense challenge. This thesis explores a method of detecting the fluctuations of the cosmological signal by means of the closure phase, a calibration-independent …
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On the design of lithographic interferometers and their application
… Prospects and designs for the use of grating interferometers for the fabrication of structures with 50nm spatial-periodicity are discussed. A novel, integrated, thin-film interferometer exploiting solid immersion is introduced for the fabrication of features below the diffraction-limit. Using …
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Trajectory design and control for formation flying spaceborne interferometers
… management techniques for separated space-craft interferometers to successfully synthesize images. Assuming optimal imaging configurations that satisfy astronomical requirements have been selected, a two-step approach is taken to satisfy these requirements: (1) develop a framework to man-age …
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Timekeeping and accelerometry with robust light pulse atom interferometers
Light pulse atom interferometry (LPAI) is a powerful technique for precision measurements of inertial forces and time. Laboratory LPAI systems currently achieve state-ofthe- art acceleration sensitivity and establish the international atomic time standard. However, the realization of practical LPAI …
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A combination of structurally connected and multiple spacecraft interferometers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Femtosecond laser fabrication of directional couplers and Mach-Zehnder interferometers
… in glass, a variety of devices such as couplers, interferometers, gratings, 3D structures, active waveguides, and void structures have been successfully demonstrated. In contrast to conventional semiconductor-based fabrication processes, the femtosecond laser fabrication process utilizes a single …
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Quantum noise and radiation pressure effects in high power optical interferometers
… Principle. Most notably, gravitational wave interferometers, such as the Laser Interferometer Gravitational wave Observatory (LIGO), operate within a factor of 10 of the standard quantum limit. Here we characterize and manipulate quantum noise in a variety of alternative topologies which may …
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Reliability and productivity modeling for the optimization of separated spacecraft interferometers
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.
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Developments in moire interferometry: carrier pattern technique and vibration insensitive interferometers
Due to the rapid expansion of applications of composite materials, investigations of their properties have greatly increased. Since theoretical and numerical methods have many limitations for anisotropic materials, experimental methods are sometimes the only way to answer the questions. It has been …
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Observations of the thermosphere using measurements from long-term Fabry-Perot interferometers
… temperatures from data collected by Fabry-Perot interferometers (FPI) operating in Brazil, the United States, and Morocco. These instruments observe the 630.0-nm redline emission and estimate the neutral parameters from the Doppler shift and broadening of the spectra. The instruments provide a …
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Stochastic performance analysis and staged control system designs for space based interferometers
… accuracy. Realizing the full potential of these interferometers poses several significant technological challenges. One of the most significant challenges is regulating the light pathlength, from the collecting telescopes to the combining instrument, with nanometer accuracy, despite the presence …
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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 …
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Application and simulation of imaging Fabry-Perot interferometers to observe the upper atmosphere
Thermospheric temperature and winds are important parameters in the study of upper atmosphere dynamics. The Fabry-Perot interferometer (FPI) is a spectroscopic instrument which facilitates these measurements by observing the naturally occurring airglow emissions in the thermosphere. This …
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Preliminary work for three-dimensional imaging of the epoch of reionization with interferometers
A cm line of hydrogen hyperfine structure gives us an opportunity to study the formation of the first stars [11, galaxies 121 and black holes [3] as well as the standard cosmological model in the Dark Ages and the Epoch of Reionization via both the power spectrum and direct imaging [4]. In order to …
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A study of the detection efficiency of the LIGO interferometers to transient sources
The LIGO (Laser Interferometer Gravitational Wave Observatory) detectors have now completed their fifth science run and have reached design sensitivity. Gravitational wavebursts only last for a few cycles within the characteristic frequency band of LIGO. This work focuses on the study of burst-like …
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Multi-point temperature sensing in gas turbines using fiber-based intrinsic Fabry-Perot interferometers
… ability to be multiplexed, intrinsic Fabry-Perot interferometers (IFPIs) are excellent candidates for almost any multi-point temperature or strain application, and it is well-known that using a single-mode lead-in fiber, a multi-mode fiber section as the Fabry-Perot cavity, and an additional …
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