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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 81 for “"surface 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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Electron dynamics in surface acoustic wave devices
… to generate 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 …
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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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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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Surface Acoustic Wave-Actuated Cell Sorting and Enantiomer Separation
… of cell 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 …
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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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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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Surface acoustic wave devices with low loss and high frequency operation
… Essex. Technical and market trends in the use of surface acoustic wave (SAW) devices are reviewed. As a result, three areas not previously addressed by STC were identified: lower insertion loss designs, higher operating frequencies and improved temperature dependent stability. A review of the …
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Effect of metallization on electrical performance of surface acoustic wave resonators
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Detection of Antibody-Antigen Reactions using Surface Acoustic Wave and Electrochemical Immunosensors
… In this work, immunosensors based on surface acoustic wave and electrochemical techniques are presented, which provide high specificity like conventional immunoassays and the real-time monitoring of immunoreactions can be achieved. Surface acoustic wave devices have been widely used in …
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Surface Acoustic Wave Nebulization as a Mass Spectrometry Ionization Source, Characterization and Application
… the internal energy distribution of ions. The surface acoustic wave nebulization (SAWN) is a nebulization method generating both positive and negative ions from liquid phase. We have validated this method by successfully ionizing protein, peptide, lipid and other small molecules. The measured …
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Quantitative assessment of elasticity properties of skin using surface acoustic wave (SAW) method
… research thesis studies the intersection of acoustics, optics and biomechanics for skin mechanical properties measurement. Surface acoustic wave (SAW) is induced and applied to a range of different tissue mimicking phantom models, Thiel cadavers and in vivo human skin. Different optical …
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Real-time 3-d localization using radar and passive surface acoustic wave transponders
… processes are utilized to fabricate the passive surface acoustic wave transponders used in this thesis. These transponders have advantages over existing solutions with their small size (mm x mm), zero-power, high-accuracy, and kilohertz update rates. Commercial applications such as human machine …
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Development and evaluation of an acylating agent detector using surface acoustic wave devices
… to specific vapors is a highly desirable goal. Surface Acoustic Wave (SAW) devices have been used for chemical analysis since 1978. While sensitive to mass changes occurring on their surfaces, they are not selective to the mass they will detect. Their use as chemical sensors requires the …
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