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 221 for “"acoustic wave"”.
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Surface acoustic wave optical modulation
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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Semen quality detection using acoustic wave sensors
Artificial insemination (AI) is a widely used part of the modern agricultural industry, with the number of animals inseminated globally being measured in the millions per anum. Crucial to the success of AI is that the sperm sample used is of a high Quality. Two factors which determine the quality …
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Electron dynamics in surface acoustic wave devices
… coupled mechanical and electrical surface acoustic waves (SAWs) by applying a high-frequency voltage to a transducer on the surface of GaAs. By combining SAWs with existing low-dimensional nanostructures one can create a series of dynamic quantum dots corresponding to the minima of the …
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Surface-acoustic-wave-defined dynamic quantum dots
The strain associated with a surface acoustic wave (SAW) propagating across a piezoelectric medium creates a travelling electric potential. Gallium Arsenide is such a piezoelectric material, and so SAWs can be used with existing semiconductor technologies for creating complex low-dimensional …
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Surface acoustic wave gratings of finite width
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1979.
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Surface acoustic wave probes for chemical analysis
Surface Acoustic Wave delay lines have been used as probes for chemical analysis. The interaction between matter adjacent to the SAW device surface and the propagating Raleigh wave caused measurable changes in the amplitude, phase and resonant frequency of the wave. The effectiveness of various …
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Capacitive Tap Weight Network Surface Acoustic Wave Transducers
Made available in DSpace on 2014-12-12T20:54:38Z (GMT). No. of bitstreams: 1 7726711.pdf: 2591568 bytes, checksum: bcd9db246fba0e37cd77aeae26d3ae40 (MD5) Previous issue date: 1977
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Studies in Surface Acoustic Wave Reflectors and Resonators
Made available in DSpace on 2014-12-12T20:54:58Z (GMT). No. of bitstreams: 1 7915347.pdf: 2187352 bytes, checksum: 63bbb8442805ca5258b40c2e20c4026d (MD5) Previous issue date: 1979
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Acoustic wave scattering from a random ocean bottom
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, and Woods Hole Oceanographic Institution, 1991.
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Numerical Analysis of Multi-Functional Surface Acoustic Wave Sensor
<p>A surface acoustic wave (SAW) sensor can have broad industrial applications due to its compact size, low cost-effectiveness, and versatility of sensible measurands, as well as the wireless capabilities. In this study, a theoretical modeling approach accompanied by a MATLAB-based algorithm of the …
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Characterising room temperature ionic liquids with acoustic wave devices
Data for the physical properties of Room Temperature Ionic Liquids (RTILs) as a function of chemical composition is limited due to the expense and difficulty of producing large volumes of pure samples for characterization. RTILs comprise solely of ions and are liquid at room temperature. These are …
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Surface Acoustic Wave-Actuated Cell Sorting and Enantiomer Separation
… sorting and enatiomer separation using surface acoustic wave-actuated fluid flow. We model a high throughput sorting of two different types of biological cells (type I and type II) by a biomedical micro-electro-mechanical system (BioMEMS) whose operating principle depends on surface acoustic …
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In-liquid bulk acoustic wave resonators for biosensing applications
Gravimetric sensors based on thin-film bulk acoustic wave (BAW) resonators operating between 1-5 GHz have tremendous potential as biosensors because they are inexpensive, label-free, fast and highly sensitive. The two main challenges in this objective are: the conventional longitudinal mode …
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Extrinsic Fabry-Perot interferometer for surface acoustic wave measurement
A surface acoustic wave sensor based on an extrinsic Fabry-Perot interferometer is described. A single-mode fiber, used as the input/output fiber, and a multimode fiber, used mainly as a reflector, form an air-gap that acts as a low-finesse Fabry-Perot cavity. The Fresnel reference reflection from …
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Scattering Matrix Analysis of Surface Acoustic Wave Reflectors and Transducers
… matrix consisting of one electrical and two acoustic ports. These scattering parameter analytical expressions are functions of material constants, electrode geometry, and frequency. The three port single electrode scattering matrices are acoustically cascaded to produce a three port device …
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Surface acoustic wave single-phase unidirectional transducers and phase weighting
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1985.
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Langasite bulk acoustic wave resonant sensor for high temperature applications
(cont.) The self consistent defect model established the defect chemistry of langasite, enabling important parameters describing reduction (Er = 5.70± -0.06eV and 6.57±-0.24eV for acceptor and donor doped langasite respectively) and oxidation (Eo = 2.18±0.08eV), intrinsic electron-hole generation …
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Effect of liner thickness on acoustic wave propagation in ducts
The acoustic characteristics of a point-reacting duct liner that consists of a porous facing sheet backed by cellular cavities are derived by examining the wave propagation within the liner. The relation between the derived expression for the liner acoustic admittance and a semi-empirical formula …
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Development to a Flexible Surface Acoustic Wave Sensor for Strain Sensing
<p>Surface acoustic wave (SAW) sensors have increasing demand in structural health monitoring due to their passive, variable bandwidth, reliable life-cycle, high accuracy, small size, and light nature. SAW sensors can not only provide the static states of the structural system, such as temperature …
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Immersed Discontinuous Galerkin Methods for Acoustic Wave Propagation in Inhomogeneous Media
… element methods for one and two dimensional acoustic wave propagation problems in inhomogeneous media where elements are allowed to be cut by the material interface. The proposed methods use the standard discontinuous Galerkin finite element formulation with polynomial approximation on …
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