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 66 for “"Acoustic Sensing"”.
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Changepoint detection for acoustic sensing signals
… detection methodology for the analysis of acoustic sensing signals. In the first part, we propose a detection procedure for changes in the second-order structure of a univariate time series. This utilises a penalised likelihood based on Whittle’s approximation and allows for a non-linear …
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On Distributed and Acoustic Sensing for Situational Awareness
… part: one pertaining to collaborative spectrum sensing while the other on distributed parameter estimation with correlated additive Gaussian noise. In the second part, we employ a single acoustic sensor with co-located microphone and loudspeaker to reconstruct a 2-D convex polygonal room …
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Acoustic sensing of renal stone fragmentation in extracorporeal shockwave lithotripsy
… carried out by the author on the exploitation of acoustic emissions detected during extracorporeal shockwave lithotripsy (a non-invasive procedure for the treatment of urinary stones) to develop a new diagnostic system. The work formed part of a research project on lithotripsy undertaken by the …
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Robotic Eavesdropping: Effects of Bioinspired Acoustic Sensing on Tracking and Estimation
… of how fusing active and passive ultrasonic sensing may effect the information available to a robotic vehicle. Our first investigation was an experimental verification of the capabilities of a stereo sensor for passively tracking an ultrasonic sound source using limited a priori information …
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High-Performance Accelerometer Based On Asymmetric Gapped Cantilevers For Physiological Acoustic Sensing
… an excellent choice for continuous physiological acoustic signal monitoring. However, in order to capture the detailed information in the physiological signals for clinical diagnostic purpose, there are more demanding requirements on the sensitivity/noise performance of accelerometers. In this …
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Distributed acoustic sensing: modelling, full waveform inversion, and its use in seismic monitoring
Distributed acoustic sensing (DAS) is a rapidly evolving seismic acquisition technology. Employing rugged and small optical fibers, DAS offers an opportunity for access to acquisition geometries often not accessible to more conventional geophone sensors. This is a highly attractive property of DAS …
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Deep Learning-Driven Modeling of Dynamic Acoustic Sensing in Biommetic Soft Robotic Pinnae
… networks capable of predicting the beampattern (acoustic radiation pattern) of a soft-robotic pinna as function of its actuator states. The pinna model geometry is derived from a tomographic scan of the right ear of the greater horseshoe bat (textit{Rhinolophus ferrumequinum}. Three virtual …
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Investigating group behavioral quantization of oceanic fish with Continental-shelf scale ocean-acoustic sensing
… populations in natural habitats. Here we use acoustics to observe the ocean environment and study fish behavior during the critical spawning period over continental-shelf scales. Fish are known to be one of the main sources of strong natural returns in the continental-shelf environment, and so …
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Magnetic Field Sensing via Multi-Material Acoustic Sensing Optical Fibers with Magnetostrictive Cladding Inclusions
… are tested and investigated to demonstrate sensing capabilities at different field magnitudes and frequencies. Distributed acoustic sensing fibers (DAS) have been largely studied and documented across a variety of applications and sensing systems. This research uses the DAS technology in …
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Non-Invasive Flow Measurement Via Distributed Acoustic Sensing Utilizing Frequency Spectra Analysis of Wall Pressure Fluctuations
… research describes a method of using distributed acoustic sensing to noninvasively measure volumetric flow rate via multiple unique sensor styles. This work modifies previously used methods of flow detection via fiber optic acoustic sensors affixed onto the exterior body of a flow apparatus. Flow …
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The effect of attenuation from fish on long-range active and passive acoustic sensing in the ocean
Attenuation from fish can reduce the intensity of acoustic signals and significantly decrease detection range for long-range active and passive sensing in the ocean. This makes it important to understand the relevant mechanisms and accurately predict attenuation from fish in underwater acoustic …
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Distributed optical fibre smart sensors for acoustic sensing in the structural health monitoring of robust aerospace vehicles
… optical fibre smart sensors for the detection of acoustic signals in the Structural Health Monitoring (SHM) of robust aerospace vehicles has been demonstrated. Current distributed optical fibre sensors are multiplexed along a single fibre. Inherent problems exist with a multiplexed architecture. …
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The Effect of Attenuation from Fish on Long-Range Active and Passive Acoustic Sensing in the Ocean
Attenuation from fish can reduce the intensity of acoustic signals and significantly decrease detection range for long-range active and passive sensing in the ocean. This makes it important to understand the relevant mechanisms and accurately predict attenuation from fish in underwater acoustic …
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Fiber-Optic Michelson Interferometer with Faraday Mirrors for Acoustic Sensing using a 3 × 3 Coupler and Symmetric Demodulation Scheme
For the past 40 years, acoustic sensing has been a major avenue for the growth of interfero- metric fiber-optic sensors. Fiber-optic acoustic sensors have found uses in military, commer- cial, and medical applications. An interferometric fiber-optic acoustic sensor is presented utilizing the …
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Exploiting Artificial Intelligence in Volcanic Monitoring for Distributed Acoustic Sensing Analysis and GNSS-Based Source Inversion [L’Intelligenza Artificiale per il monitoraggio vulcanico: analisi di segnali DAS e modellazione della sorgente tramite inversione di dati GNSS]
… attraverso la nuova tecnologia Distributed Acoustic Sensing (DAS) durante la crisi di Vulcano (Italia) nel 2021. Il periodo di unrest, iniziato a settembre 2021, è stato caratterizzato da un incremento di sismicità, con l’occorrenza di numerosi eventi sismici a bassa frequenza. Nel gennaio …
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Passive Acoustic Localization and Tracking with Mobile Robots
<p>Acoustic sensing has received a lot of attention in the underwater domain as this is usually the only form of sensing available. As robotic platforms have been ever increasing in terms of computational capabilities, there now exists the ability to autonomously make decisions and navigate without …
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Efficient Algorithms for Data Analytics in Geophysical Imaging
Modern sensing systems such as distributed acoustic sensing (DAS) can produce massive quantities of geophysical data, often in remote locations. This presents significant challenges with regards to data storage and performing efficient analysis. To address this, we have designed and implemented …
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Laser Doppler Vibrometry Based Remote Sensing for Active Noise Control
… used in to measure vibrations in many vibro-acoustic applications. Yet, the developed instrument, laser Doppler vibrometer (LDV), has little been studied in the published literature in the context of sound/noise measurement and control. This thesis, therefore, investigates and develops …
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URBAN SEISMIC AMBIENT NOISE ANALYSIS: INNOVATIONS AND APPLICATIONS
… properties and needs to be analyzed. Distributed acoustic sensing (DAS) is a recently developed seismic sensor that allows for long-term, high-spatial resolution, and real-time monitoring at lower costs. However, traditional processing methods may not be reliable when applied to DAS ambient noise …
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Acoustic Tomography and Thrust Estimation on Turbofan Engines
Acoustic sensing provides a possibility of measuring propulsion flow fields non-intrusively, and is of great interest because it may be applicable to cases that are difficult to measure with traditional methods. In this work, some of the successes and limitations of this technique are considered. …
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