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Showing 1 to 20 of 192 for “"acoustic waves"”.
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Characterisation of acoustic waves in optical waveguides
… the coherent interactions between optical and acoustic modes. The SBS can be considered as a primary obstacle effect in limiting the power scaling in many high power photonic devices because it normally has a lower threshold than other nonlinear effects. However, it is also well known that the …
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Fermionic Quantum Information in Surface Acoustic Waves
… of the control of single electrons in a surface-acoustic-wave-based quantum circuit. However, work in this field is far from over. I present various research paths for future projects. These include going beyond the time-dependent Schrödinger equation to capture more complicated dynamics, using …
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Finite amplitude resonant acoustic waves without shocks
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1995.
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The characterisation of acoustic waves in optical waveguides
… the coherent interactions between optical and acoustic modes. The SBS can be considered as a primary obstacle effect in limiting the power scaling in many high power photonic devices because it normally has a lower threshold than other nonlinear effects. However, it is also well known that the …
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Theory of Guided Acoustic Waves in Piezoelectric Solids
Made available in DSpace on 2014-12-12T20:55:05Z (GMT). No. of bitstreams: 1 8009012.pdf: 2172383 bytes, checksum: 4b1e9cf75ab6f3ca6f05ebb0312b4f7d (MD5) Previous issue date: 1979
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Modeling of acoustic waves for linear phased arrays
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.
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Steady-state nonlinear interactions of surface acoustic waves.
Thesis. 1977. Elec.E.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
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DIRECT VOLTAGE MEASUREMENTS USING BULK ACOUSTIC WAVES IN LiNbO3
… effects. A piezoelectric crystal-based bulk acoustic wave sensor using lithium niobate (LiNbO3) that has applications to metrology, research, and power metering was developed to overcome these measurement issues with the factors of scalability, ease of use, and compactness in mind. A Y+36° …
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Numerical simulation of acoustic waves in a rectangular chamber
<p>Numerical simulation of acoustic waves in a closed two-dimensional rectangular chamber is considered. The waves are generated by a membrane or piston boundary condition on one wall. The simulations are performed through many acoustic cycles. A stack of heat exchanger plates are sometimes …
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Imaging surface acoustic waves in anisotropic and periodic media
… has been developed for studying surface acoustic wave propagation. The technique, which uses non-contact immersion transducers to excite and detect ultrasound with frequencies between 1 and 20 MHz, allows convenient examination of surface waves traveling in arbitrary directions on a …
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Flexible Strain Detection Using Surface Acoustic Waves: Fabrication and Tests
… monitoring applications. Among them, a Surface Acoustic Wave sensor (SAW) offers an overwhelming advantage over other commercial sensing technologies due to its passive, small size, fast response time, cost-effectiveness, and wireless capabilities. Development of SAW sensors allows investigation …
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Group Velocity Of Acoustic Waves In Plates Of Electronic Materials
… and dispersion characteristics of plate acoustic waves (PAW) in electronic materials are investigated experimentally. Plate acoustic waves are elastic waves that travel along a plate with thickness comparable to the wavelength of the waves. Lamb waves, a type of plate acoustic wave, have …
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Photoexcited hypersonic surface acoustic waves propagating under periodic metal grating
… an attractive way of producing coherent surface acoustic waves (SAW). Ultrafast laser pulses incident on this structure produce constrasting thermal strain in the grating and the substrate thus launching surface acoustic waves. The frequency of the SAW is inversely dependant on the period of the …
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Reducing extrinsic damping of surface acoustic waves at gigahertz frequencies
High-frequency surface acoustic waves (SAWs) in the GHz range can be generated using absorption from an ultrafast laser in a patterned metallic grating on a substrate. Reducing the attenuation at these frequencies can yield better sensors as well as enable them to better probe phonon and …
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Wavelet-based inversion of seismo-acoustic waves in arctic ice
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995.
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Design and fabrication of granular materials for surface acoustic waves
… to novel propagation behaviors of mechanical waves. Acoustic studies of granular media typically involve macroscopic particles whereas contact-based vibrations of microparticles remain largely unexplored. The adhesion which can be neglected on millimeter scale is significant on micron scales …
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Bistatic scattering of acoustic waves from a rough ocean bottom
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997.
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Coalescence of nonlinear acoustic waves, with application to supersonic jet noise
… of coalescence that occurs when neighboring acoustic waveforms propagate in nearly the same direction and intersect to form a larger-amplitude waveform with increased nonlinear distortion. Coalescence is proposed as an explanation for the observation of steepened Mach waveforms and crackle …
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Mechanical characterisation of soft biological tissue by using surface acoustic waves
… or disease progression tracking. Surface acoustic waves (SAWs) have been preliminarily used for the characterisation of tissue mechanical properties and it is increasingly becoming a topic of research interest as SAWs can provide more localised information in the tissue near-surface region …
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