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 35 for “"Wave detection"”.
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Diffractive gratings in high-precision interferometry for gravitational wave detection
… of space-time and predicts gravitational waves. Laser interferometric gravitational wave detectors attempt to observe the strain gravitational waves exert on space-time, which is obscured by seismic, thermal and quantum among other noises. Diffraction gratings have been proposed in all …
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Novel approaches to Newtonian noise suppression in interferometric gravitational wave detection
The Laser Interferometer Gravitational-wave Observatory (LIGO) attempts to detect ripples in the curvature of spacetime using two large scale interferometers. These detectors are several kilometer long Michelson interferometers with Fabry-Perot cavities between two silica test masses in each arm. …
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Squeezed Vacuum Injection in Advanced LIGO: Enhancing Gravitational-Wave Detection Using Quantum States of Light
… in the direct measurement of gravitational waves with the Advanced LIGO detectors. During the Observation Run O3, from April 1st, 2019 to March 27, 2020, squeezing improved the sensitivity of the LIGO interferometers to gravitational-wave signals above 50 Hz by up to 3 dB, increasing the …
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Design and characterisation of long period grating (LPG) - based optical fibre sensors for acoustic wave detection
… and evaluation of LPGs for acoustic wave detection. In doing so, the LPG-based sensor has been evaluated and optimized under low frequency conditions (up to 3 kHz) both in air and underwater, with varying acoustic pressure values. This complements the research widely reported for the …
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Quantum Optics and Mechanics in Gravitational-Wave Detectors
Gravitational-wave detectors like Advanced LIGO probe perhaps the most cataclysmic events since the Big Bang, involving objects tens to hundreds of times more massive than the Sun, yet they remain at the whim of minute quantum fluctuations. Pushing our reach further into the cosmos demands a …
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The Generation and Detection of Squeezed Microwave Photons Realized using Traveling-Wave Parametric Amplifiers
… noise in applications spanning gravitational wave detection, biological microscopy, and quantum information science. In circuit quantum electrodynamics, Josephson parametric amplifiers play a crucial role in quantum-limited amplification and squeezed microwave generation. In this thesis, we …
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Characterization of ion Cluster fragmentation in ionic liquid ion sources
… attitude control applications such as gravity wave detection and exoplanet imaging. Novel room temperature molten salts, called ionic liquids, are used as propellant, which are composed purely of positive and negative molecular ions. When exposed to strong electric fields, ions and metastable …
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Temperature insensitive fiber optic interferometer and applications
… limitations are discussed. A surface acoustic wave detection scheme is successfully demonstrated. Results of a magnetic field sensor using the miniaturized Michelson interferometer and a magnetostrictive material are presented.
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Topics in Gravitational-Wave Astrophysics
… we study the applicability of different waveform models in</p> <p>gravitational wave searches for comparable mass binary black holes. We determine</p> <p>the domain of applicability of the computationally inexpensive closed form models,</p> <p>and the same for the semi-analytic models …
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Observation of mechanical bound states in the continuum
… potential of various applications, such as microwave signal processing, interferometric gravitational wave detection and quantum mechanical oscillators. A common way to realize phonon trapping is through suspended structures as phonon transportation relies on medium and cannot permeate through …
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Broadband Squeezed Microwaves and Amplification with a Josephson Traveling-Wave Parametric Amplifier
… scientific breakthroughs from gravitational wave detection to biological microscopy enhancement. The generation of highly-squeezed states using superconducting amplifiers is a foundation for quantum optics and quantum metrology in the microwave domain. In superconducting circuits, researchers …
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Conditional Mechanical Squeezing of a Micromechanical Oscillator Approaching the Quantum Regime
… and momentum sensing like in gravitational wave detection and atomic force microscopy. Recently the field has entered the quantum regime, with the interaction being used to prepare pondermotively squeezed states of light, optical-optical entanglement, motional ground states, and more. In …
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Detection of in-plane stress waves with Polyvinylidene Fluoride (PVDF) sensors
… the application of the PVDF sensors for detection of in-plane stress waves in 31 and 32 modes. This was achieved by focusing on aspects of PVDF sensing related to determination of impact force, detection of stress wave propagation, and the stress averaging effect of PVDF sensors.</p><p>An …
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NEW GRAVITATIONAL INTERACTIONS IN COSMOLOGY —- FROM EFFECTIVE FIELD THEORY TO OBSERVATION
… systems, discussing their roles in gravitational wave detection and their potentials for testing modified gravity theories. Through these studies, this thesis aims to contribute to the ongoing dialogue between gravitational physics and cosmology.
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Acoustoelastic effects of surface waves in concrete subjected to compressive and bending stresses
… of acoustoelastic effects on Rayleigh surface waves (R-waves) in concrete samples subjected to 4-point load bending and uniaxial compression, considering a broad range of strain levels. The main objectives are (1) to study individually the acoustoelastic effects in tension and compression, …
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DETECTION AND INFERENCE IN GRAVITATIONAL WAVE ASTRONOMY
<p>We explore the detection and astrophysical modeling of gravitational waves de- tected by the Advanced Laser Interferometer Gravitational wave Observatory (LIGO) and Virgo. We discuss the techniques used in the PyCBC search pipeline to discover the first gravitational wave detection GW150914, and …
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Expanding ultrafast photoacoustics for investigation of mechanical properties and thermal transport
… pulses were used to generate and detect acoustic waves. To expand the acoustic phonon frequency bandwidth and range, a thin metal film, a strongly magnetostrictive galfenol film, and strained piezoelectric InGaN/GaN multiple quantum wells were used as transducers. Acoustic wave detection methods …
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Exploiting pulsar timing at low radio frequencies: applications to Pulsar Timing Arrays, Interstellar medium and HII regions
… pulsar timing can both enhance gravitational-wave detection efforts and provide new insight into the structure and turbulence of the ionised interstellar medium.
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A flexible underwater pressure sensor array for artificial lateral line applications
… an aquatic vehicle, the array enables obstacle detection, identification and tracking, and can help the vehicle reduce its hydrodynamic drag by providing information about the surrounding ow. This thesis begins with the development of a carbon black-PDMS elastomer material set. Using the …
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