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 26 for “"acoustic detection"”.
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A Turbo Approach to Distributed Acoustic Detection and Estimation
… model for testing fusion theories for these acoustic multi-sensor networks. An iterative, lossless data fusion algorithm was presented as the model for simulation development. The arrangement and orientation of objects in the simulation environment, as well as most other system parameters are …
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An optic fiber sensor for partial discharge acoustic detection
… to power outage and expensive repairs. The acoustic wave induced by PD can be measured and used for monitoring, diagnosing, and locating potential failures in power transformers. The effects of the temperature of the transformer and transformer oil are one of the very important parameters in …
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Demonstration of passive acoustic detection and tracking of unmanned underwater vehicles
… spectral filters resulted in a probability of detection of 96% and false alarms of 18% at a distance of 100 m, with boat traffic in a river environment. Tracking the vehicle with adaptive beamforming resulted in a 6.2±5.7 ∘ absolute difference in bearing. The principal achievement of this work …
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Environmental and Statistical Performance Mapping Model for Underwater Acoustic Detection Systems
… a methodology to combine environmental models, acoustic signal predictions, statistical detection models and operations research to form a framework for calculating and communicating performance. This methodology has been applied to undersea target detection systems and has come to be known as …
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Demonstration of passive acoustic detection and tracking of unmanned underwater vehicles
… spectral filters resulted in a probability of detection of 96 % and false alarms of 18 % at a distance of 100 m, with boat traffic in a river environment. Tracking the vehicle with adaptive beamforming resulted in a 6.2 ± 5.7° absolute difference in bearing. The principal achievement of this …
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Feasibility of Passive Acoustic Detection of Coronary Artery Disease Utilizing Source Separation
… to the diagnosis of CAD that relies upon detection of the sound generated by turbulent flow downstream from occlusions. Although the technique is commonly used for the carotid arteries, in the case of the coronary arteries the technique is hampered by signal-to-noise problems as well as …
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Advances in passive acoustic detection, localization, and tracking applied to unmanned underwater vehicles
Detection, classification, localization, and tracking (DCLT) of unmanned underwater vehicles (UUVs) in the presence of shipping traffic is a critical task for passive acoustic harbor security systems. In general, vessels can be tracked by their unique acoustic signature due to machinery vibration …
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Advances in Passive Acoustic Detection, Localization, and Tracking Applied to Unmanned Underwater Vehicles
Detection, classification, localization, and tracking (DCLT) of unmanned underwater vehicles (UUVs) in the presence of shipping traffic is a critical task for passive acoustic harbor security systems. In general, vessels can be tracked by their unique acoustic signature due to machinery vibration …
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Evaluation of an acoustic detection algorithm for reactive collision avoidance in underwater applications
This thesis sought to evaluate a vehicle detection algorithm based on a passive acoustic sensor, intended for autonomous collision avoidance in Unmanned Underwater Vehicles. By placing a hydrophone at a safe distance from a dock, it was possible to record the acoustic signature generated by a small …
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An Exploration of the Acoustic Detection and Localization of Small Uncrewed Aerial Systems
… airspace conflict. A feasibility exploration of acoustic detection and localization of non-cooperative aircraft using a low-cost microphone array, computationally inexpensive beamforming algorithms, and filtering techniques, is performed. The cost of the system is minimized by utilizing widely …
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Deployment of a passive acoustic detection system for reactive collision avoidance in autonomous underwater vehicles
… a collision avoidance system based on passive acoustic sensing, which may be used to alert an AUV's autonomy software of the threat that an approaching vessel may represent in such shallow water environments. Experiments were conducted to collect and process data from static and vehicle-mounted …
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Ultrasound detection using singlemode optical fibers with applications to epoxy cure monitoring
… The moduli properties of the resin determine the acoustic properties of the epoxy.<sub>[12],[13],[14]</sub> Hence measurement of the acoustic longitudinal velocity and attenuation of the epoxy during its cure cycle provides a good indicator of the state of cure. Optical fiber waveguides can be …
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Partial Discharge Detection and Localization in High Voltage Transformers Using an Optical Acoustic Sensor
… and insulation breakdown. This is why PD detection is used in power systems to monitor the state of health of high voltage transformers. If such problems are not detected and repaired, the strength and frequency of PDs increases and eventually leads to the catastrophic failure of the …
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Cavitation in focused ultrasound
… designed to avoid the formation<br/>of acoustic standing waves, known to have a critical influence<br/>on cavitation behaviour. A new technique of laser-nucleated acous-<br/>tic cavitation is presented, whereby a laser-pulse of energy below the<br/>breakdown threshold for the host …
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Defining and modeling the limits of high-resolution underwater acoustic imaging
In underwater warfare, detection of sea mines is a challenging discipline. Within the field of sea mine hunting, the detection of fully buried sea mines has always been the most difficult. In fact all objects located under water near to interfaces with high acoustic and or magnetic impedance …
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An investigation of the roles of geomagnetic and acoustic cues in whale navigation and orientation
… a first look at the roles of geomagnetic and acoustic cues in humpback whale navigation and orientation, in addition to documenting some effects of human-produced sound on beaked whales. The tracks of satellite-tagged humpback whales migrating from Hawaii to Alaska were found to have …
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An investigation of the roles of geomagnetic and acoustic cues in whale navigation and orientation
… a first look at the roles of geomagnetic and acoustic cues in humpback whale navigation and orientation, in addition to documenting some effects of human-produced sound on beaked whales. The tracks of satellite-tagged humpback whales migrating from Hawaii to Alaska were found to have …
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The cavitation subharmonic signal : mechanistic source and optimised detection
… at frequency values sub-multiple to that of the acoustic driving, is held to be exclusive to the occurrence of driven bubbles within a host medium. Recently, detection of the subharmonic signal has seen a resurgence of interest, particularly for the prospect of cavitation-mediated therapy during …
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Optical-Resolution Photoacoustic Microscopy
… assessable. The emergence of biomedical photoacoustics has led to a new branch of optical microscopy--OR-PAM. As a valuable complement to existing optical microscopy technologies, OR-PAM detects optical absorption contrasts with exquisite sensitivity: i.e., 100%). Combining OR-PAM with …
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