Active Nonreciprocal and Nonlinear Surface Acoustic Wave Devices in a Heterogeneously Integrated InGaAs on Lithium Niobate Material Platform.
Abstract not provided.
Hackett, Lisa Anne Plucinski↗
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Results for “acoustical waves”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Demonstration of Acoustically Driven Ferromagnetic Resonance Using Leaky Surface Acoustic Waves in Lithium Tantalate
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Tiwari, Sidhant↗
Low frequency acoustic waves in the atmosphere: A diagnostic for impulsive sources
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Silber, Elizabeth Allaryce↗
Shock and Acoustic Wave Dissipation in Polyethylene-Ceria Nanocomposites
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Moore, Nathan W. [Sandia National Laboratories (SN↗
An Electrically-Injected Solid State Surface Acoustic Wave Phonon Laser
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Wendt, Alexander [University of Arizona]↗
Correlation and spectrum of dust acoustic waves in a radio-frequency plasma using PK-4 on the International Space Station
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J. Goree↗
Experimental observation of cnoidal waveform of nonlinear dust acoustic waves
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Bin Liu↗
On the role of ion acoustic waves in the transition region
Ion sound waves in transition layer of exosphere
ION↗
Plasma heating by magneto-acoustic waves
Using magnetosonic resonance for plasma heating
Kovan, I. A.↗
Analysis and computer programs to calculate acoustic wave properties of baffled chambers
Analytical methods and four computer programs have been developed for calculating wave motion in closed, baffled chambers with rigid and non-rigid boundaries. Application of these methods to design of injector-face baffles in liquid propellant engines will provide significant insight into effects of baffles on combustion stability.
Oberg, C. L.↗
Acoustic-wave detection via a piezoelectric field-effect transducer.
An oriented piezoelectric film has been incorporated in the insulator region of a silicon insulated-gate field-effect transistor to provide a sensitive high-frequency strain transducer. With this device, strains as low as 10 to the -8th power have been detected, and gauge factors of roughly 7000 have been attained for applied ac strains at 5.6 MHz.
Greeneich, E. W.↗
Reflection coefficients for acoustic waves interacting with stratified media.
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Kong, J. A.↗
Surface acoustic wave stabilized oscillators: Additional aging results
Updated aging data for SAW oscillators with aluminum transducers on ST-cut quartz, for gold transducers on ST-cut quartz, and for aluminum transducers on SiO2/LiTaO3. Devices with gold transducers age differently (both and shape of curve) from those having a aluminum transducers indicating the transducer metallization can represent an important aging mechanism.
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The 2.2 GHz Surface Acoustic Wave (SAW) oscillator development Ku-band frequency source development
Two 2.2 GHz SAW oscillators using aluminum nitride on sapphire (AlN/Al2O3) delay lines were fabricated. The oscillators were electronically temperature compensated and characterized. One of the oscillators was used as the frequency reference for the Ku band source; the second oscillator is available for continued evaluation. A 15 GHz frequency source was designed and fabricated. The 15 GHz source consists of a Ku band FET oscillator which is phase locked to the frequency multiplied (X7) output of the 2.2 GHz SAW reference source. The Ku band source was built using microstrip circuit designs, which are hybrid compatible. Two wafer runs of 2.2 GHz TED devices were fabricated and evaluated. The devices were mounted on microstrip test substrates and evaluated as 15 GHz divide by 7 circuits. The device evaluation indicated that in their present form the TED is not a practical circuit element.
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Torque generated by orthogonal acoustic waves - Theory
An analytical calculation of the torque generated by orthogonal waves is reported. This torque is a result of a viscous effect, rather than the Bernoulli effect as in Rayleigh's torque. The agreement between the reported experimental values and this calculation is excellent.
Busse, F. H.↗
Dual differential interferometer for measurements of broadband surface acoustic waves
A simple duel interferometer which uses two pairs of orthogonally polarized optical beams to measure both the amplitude and direction of propagation of broadband ultrasonic surface waves is described. Each pair of focused laser probe beams is used in a separate wideband differential interferometer to independently detect the component of surface wave motion along one direction on the surface. By combining the two output signals corresponding to both components, the two dimensional surface profile and its variation as a function of time is determined.
Turner, T. M.↗
Numerical solutions of acoustic wave propagation problems using Euler computations
This paper reports solution procedures for problems arising from the study of engine inlet wave propagation. The first problem is the study of sound waves radiated from cylindrical inlets. The second one is a quasi-one-dimensional problem to study the effect of nonlinearities and the third one is the study of nonlinearities in two dimensions. In all three problems Euler computations are done with a fourth-order explicit scheme. For the first problem results are shown in agreement with experimental data and for the second problem comparisons are made with an existing asymptotic theory. The third problem is part of an ongoing work and preliminary results are presented for this case.
Hariharan, S. I.↗