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 42 for “"acoustic sensors"”.
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Noise suppression with non-air-acoustic sensors
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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Microfabricated Acoustic Sensors for the Detection of Biomolecules
MEMS (Microelectromechanical Systems) acoustic sensors are a promising platform for Point-of-Care biosensing. In particular, piezoelectrically driven acoustic sensors can provide fast results with high sensitivity, can be miniaturized and mass produced, and have the potential to be fully integrated …
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Bio-inspired acoustic sensors and systems - from biology to engineering exploiting feedback computation
In order to design sensors and systems that can be sensitive to small signal levels even when immersed by background noise, may require out-of-the-box thinking. Biology can provide inspiration to achieve that, allowing the engineering landscape to borrow interesting ideas with the aim to solve …
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Automatic baleen whale detection and 2D localization using a network of unsynchonized passive acoustic sensors
Underwater acoustics is a powerful tool for learning about the ocean’s soniferous marine life. However, most modern acoustic sensing systems consist of expensive arrays of timesynchronized recorders which require a crewed research vessel and significant expertise to deploy, operate, and recover. …
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Automatic Baleen Whale Detection and 2D Localization Using a Network of Unsynchronized Passive Acoustic Sensors
Underwater acoustics is a powerful tool for learning about the ocean's soniferous marine life. However, most modern acoustic sensing systems consist of expensive arrays of time-synchronized recorders which require a crewed research vessel and significant expertise to deploy, operate, and recover. …
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Acoustically optimized propulsion systems using a Cause-Effect Controller
The proposed Acoustic Response Control Process (ARCP) allows for a "Cause- Effect" Controller (CEC) to provide a method to optimize the trade-off between a marine vessel's ability to maneuver and the radiated acoustic noise (or internal vibrations). Through the discretization of both a marine …
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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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The potential of LIDAR as an antisubmarine warfare sensor
… warfare (ASW) has been dominated by acoustic sensors, active and passive. Ending the Cold War, the ASW forces have refocused towards a theatre of war in the littorals, and the traditional acoustic sensors do not perform very well in such an environment. The sensors are working much …
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Localization of acoustic transients in shallow water environments
… of an underwater target's position using passive acoustic sensors is of considerable use for the Navy, both for Anti-submarine warfare (ASW) and underwater surveillance. This thesis proposes and develops localization algorithms capable of passively determining the location of a transient source …
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Fiber inline pressure and acoustic sensor fabricated with femtosecond laser
"Pressure and acoustic measurements are required in many industrial applications such as down-hole oil well monitoring, structural heath monitoring, engine monitoring, study of aerodynamics, etc. Conventional sensors are difficult to apply due to the high temperature, electromagnetic-interference …
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Tracking an underwater target
… surface vessel (ASV), equipped with both acoustic instrumentation and wireless or radio communication technology, can successfully track the AUV and interface with scientists. An ASV named RoBoat, built at MIT in undergraduate classes using a kayak hull, is vessel that can be controlled …
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Evaluation by simulation of an acoustic array composed of multiple autonomous vehicles
… of frequencies. Robotic autonomy, as applied to acoustic sensors, is currently operationally limited to deployment of traditional arrays from semi-submersible tow vehicles. while such a configuration facilitates flexibility in array placement and a measure of stealth, it is an intermediate step …
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Measuring surface ocean wave height and directional spectra using an Acoustic Doppler Current Profiler from an autonomous underwater vehicle
The Acoustic Doppler Current Profiler (ADCP) is a proven technology which is capable of measuring surface wave height and directional information, however it is generally limited to rigid, bottom mounted applications which limit its capabilities for measuring deep water waves. By employing an …
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SENSING COVERAGE AND RESOURCE ALLOCATION ALGORITHMS IN SENSOR NETWORKS
… In the first scenario, we study the usage of acoustic sensors for enemy target detection and tracking. Sensor coverage areas can be overlapped. A sensor needs to exchange information about its battery life and direction of detected target to its nearby neighbors. The goal is to achieve maximal …
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Some experimental investigation on effect of light and vibration on nano coated piezo for energy harvesting
… of applications in a variety of fields such as acoustic sensors and transducers, electrical switches, medical instrumentation, artificial sensitive skin in robotics, automotive detection on roads, nondestructive testing , structural health monitoring and as a biocompatible material. In this …
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Measuring surface ocean wave height and directional spectra using an Acoustic Doppler Current Profiler from an autonomous underwater vehicle
The Acoustic Doppler Current Profiler (ADCP) is a proven technology which is capable of measuring surface wave height and directional information, however it is generally limited to rigid, bottom mounted applications which limit its capabilities for measuring deep water waves. By employing an …
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A fuzzy logic solution for navigation of the Subsurface Explorer planetary exploration robot
… exploration of Mars, and will be equipped with acoustic sensing for detecting obstacles. Measurements of obstacle distance and direction are anticipated to be imprecise however, since the performance of acoustic sensors is degraded in underground environments. Fuzzy logic is a satisfactory means …
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A study into the mapping of an induced fracture in a fine grained sediment in biaxial and triaxial stress formations
… depths. In conjunction with the flat jacks, 6 acoustic sensors can be placed around the rock sample to allow 3D mapping of the acoustic emissions occurring during the drilling and fracturing phase. 10 different shale samples were scanned (using the GE Phoenix v|tome|xs CT scanner) and their …
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Reconstruction and analysis of dynamic shapes
… which I do by using hybrid inertial and acoustic sensors. After capture, the reconstructed dynamic shapes are analyzed in order to enhance their utility. My algorithms then allow animators to generate novel motions, such as transferring facial performances from one actor onto another …
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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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