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 18 of 18 for “"acoustic resonator"”.
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Low loss film bulk acoustic resonator in liquid environments
… AT AUTHOR'S REQUEST.] A film bulk acoustic resonator (FBAR) is an acoustic resonator mass sensor using the resonance of longitudinal or shears acoustic waves. There is a significant Q factor loss in liquid medium due to acoustic energy loss. This drastically affects the minimum …
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A sealed cavity thin-film acoustic resonator process for RF bandpass filters
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Design, fabrication and testing of an acoustic resonator-based biosensor for the detection of cancer biomarkers
… thesis research is to develop microelectronic acoustic technology towards biosensor applications. The development of a simple and robust resonator that employs simple microelectronic fabrication techniques for its construction could provide the foundation for a cost-effective sensor platform. …
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ALN/ALSCN Acoustic Resonant Systems Based on Ultra-Thin Piezoelectric Films
… scandium nitride (AlN/AlScN) based acoustic resonant systems. Various microelectromechanical system (MEMS) acoustic resonators — surface acoustic wave (SAW), thin-film bulk acoustic resonator (FBAR), and Lamb wave resonators— were investigated by employing the ultra-thin …
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Evaluating energy dissipation during expansion in a refrigeration cycle using flue pipe acoustic resonators
… evaluates the feasibility of using a flue pipe acoustic resonator to dissipate energy from a refrigerant stream in order to achieve greater cooling power from a cryorefrigeration cycle. Two models of the acoustic operation of flue pipe resonant systems are examined: an electrical circuit analog …
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Investigation of thermoacoustic muffler
The design, construction and testing of a thermoacoustic muffler is discussed. The performance of the muffler is characterized by its ability to reduce the quality factor Q of an acoustic resonator. Measurement of the Q of a helium filler muffler were made for temperature differences ranging from 0 …
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Etude expérimentale des sons auto-entretenus produits par un jet issu d'un conduit et heurtant une plaque fendue
… jet becomes turbulent, and the excitation of an acoustic resonator is then not necessary.
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Design, fabrication, and characterization of a lithium niobate optomechanical photodetector based on released whispering-gallery-mode microdisk resonators
… Whispering-Gallery-Mode (WGM) micro-disk optical resonators and suspended RF MEMS acoustic resonators. The fundamental idea behind this device is changing the device’s measured impedance by shifting the resonance frequency of the acoustic resonator, which is performed by an increase in the …
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A photophonic instrument concept to measure atmospheric aerosol absorption
… photophonic phenomenon discovered by Bell and an acoustic resonator developed by Helmholtz. The design consisted of two chambers: an aerosol chamber and a reference chamber combined into a double Helmholtz resonator configuration. The radiation from the visible light source was amplitude modulated …
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Photoacoustic photonic crystal fiber gas sensor
Photoacoustic spectroscopy (PAS) is a form of laser spectroscopy that has demonstrated very high sensitivity for gas detection. Typically, PAS involves the absorption of a modulated laser beam by the gas species of interest, and the subsequent generation of acoustic waves at the modulation …
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Development and Evaluation of a Hybrid Wind Instrument
… lips interacting with a mouthpiece) and a real acoustic resonator. Attempts to produce a hybrid instrument have so far fallen short, in terms of both the accuracy and the variation in the sound produced. The principal reason for the failings of previous hybrid instruments is the actuator which, …
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Development of optomechanofluidic resonators
Optomechanofluidic resonators (OMFRs) supporting both high-optical Q factor whispering-gallery modes and high-mechanical Q factor optomechanical modes have recently emerged as a novel sensor configuration able to respond to mass density, mechanical compressibility, and viscoelasticity of label-free …
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Lithium niobate RF-MEMS oscillators for IoT, 5G and beyond
… and the low operating frequency (sub 3 GHz) acoustic oscillators currently deliver. The work introduced here enables wideband voltage-controlled MEMS oscillators (VCMOs) needed for emerging applications in IoT. Moreover, it enables multi-GHz (above 8 GHz) RF-MEMS oscillators through …
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Molecular characterization of methylated circulating tumour DNA biomarkers and their detection with low-cost biosensor
… biosensing device known as Thin Film Bulk Acoustic Resonator (TFBAR). In-liquid biosensing of these targets with TFBAR sensor was demonstrated based on the ability of these devices to detect mass changes at the surface by tracking the resonance frequency. With optimal surface …
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MEMS Hybrid Electronic Integration: From Micro-Robotic Actuation to Control and Monitoring of MEMS Sensor
… between 4 μm and 1.3 μm, and a Film Bulk Acoustic Resonator (FBAR) for particles below 1.3 μm. These sensors were previously characterized using benchtop equipment to determine sensitivity and saturation limits. To advance toward a wearable, self-contained solution, this work integrates …
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Thermally modulated solidly mounted resonators for applications in biosensing
Acoustic resonators have been widely investigated in the last decade for potential applications in biosensing owing to their compactness, low cost, ultra-high sensitivities, and robustness. These resonators employ piezoelectric films in the thickness range of 0.6 µm- 2 µm, enabling them to operate …
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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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Photonic crystal enhancement and tuning of quantum dot emission
… a high-index dielectric film, using a PC slab resonator to demonstrate enhanced emission from the QDs when they are located at a specific depth within the film. The depth of the QDs within the PC is found to modulate the resonant wavelength of the PC as well as the emission enhancement …