SEARCH · Engineering Papers
Results for “surface wave”
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Modeling and testing of a highly sensitive surface acoustic wave pressure sensor for liquid depth measurements
Not Available
Control of liquid crystals combining surface acoustic waves, nematic flows, and microfluidic confinement
The optical properties of liquid crystals serve as the basis for display, diagnostic, and sensing technologies. Such properties are generally controlled by relying on electric fields. In this work, we investigate the effects of microfluidic flows and acoustic fields on the molecular orientation and the corresponding optical response of nematic liquid crystals. Several previously unknown structures are identified, which are rationalized in terms of a state diagram as a function of the strengths of the flow and the acoustic field. The new structures are interpreted by relying on calculations with a free energy functional expressed in terms of the tensorial order parameter, using continuum theory simulations in the Landau-de Gennes framework. Taken together, the findings presented here offer promise for the development of new systems based on combinations of sound, flow, and confinement.
Demonstration of Acoustically Driven Ferromagnetic Resonance Using Leaky Surface Acoustic Waves in Lithium Tantalate
Explore the source record for details and available documents.
ACOUSTOELECTRIC SURFACE ACOUSTIC WAVE SWITCH IN AN EPITAXIAL INGAAS ON LITHIUM NIOBATE HETEROSTRUCTURE.
Abstract not provided.
Passive Surface Acoustic Wave Sensors for Early Corrosion Onset Detection
ECS 239th Meeting, Virtual, May 30-June 3, 2021
High-Fidelity Numerical Wave Tank Verification & Validation Study: Wave Generation Through Paddle Motion: Preprint
This paper presents a numerical benchmark study of wave propagation due to a paddle motion using different high-fidelity numerical models, which are capable of replicating the nearly actual physical wave tank testing. A full time series of the measured wave generation paddle motion which was used to generate wave propagation in the physical wave tank will be utilized in each of the models contributed by IEA OES Task 10's participants, which includes both computational fluid dynamics (CFD) and smooth hydrodynamic particle (SPH). The high-fidelity simulations of the physical wave testcase will allow for the evaluation of the initial transient effects from wave ramp-up and its evolution in the wave tank over time for two representative regular waves with varying levels of nonlinearity. A couple of interesting metrics like the predicted wave surface elevation at select wave probes, wave period, and phase-shift in time will be assessed to evaluate the relative accuracy of numerical models versus experimental data within specified time intervals. These models will serve as a guide for modelers in the wave energy community and provide a base case to allow further and more detailed numerical modeling of the fixed Kramer Sphere Cases under wave excitation force wave tank testing.
Active Nonreciprocal and Nonlinear Surface Acoustic Wave Devices in a Heterogeneously Integrated InGaAs on Lithium Niobate Material Platform.
Abstract not provided.
Enabling studies of long term climate effects from surface gravity waves
Abstract not provided.
Demonstration of Acoustically Driven Ferromagnetic Resonance Using Leaky Surface Acoustic Waves in Lithium Tantalate
Explore the source record for details and available documents.
An Electrically-Injected Solid State Surface Acoustic Wave Phonon Laser
Explore the source record for details and available documents.
Surface Acoustic Wave Sensors for Chemical Sensing Applications
Presented by LRST at the Monthly Colloquium, University of South Alabama, 11/12
Surface Acoustic Wave Sensor Array with Nanoporous Sensing Layers for CO2 and CH4
Presented by LRST at the IEEE IUS 2020, Las Vegas (Virtual), September 6-7, 2020, 9/7
Surface Acoustic Wave H2 and O2 Sensors Based on Conducting Metal Oxides/Langasite for Elevated Temperature Applications - presentation
<p style="text-align: justify;"><span style="font-family: Arial; font-size: 10pt;">• </span><span style="color: black; font-family: Arial; font-size: 10pt;">SAW reflective delay line devices were designed and successfully fabricated on Langasite by patterning platinum electrodes.</span><p style="text-align: justify;"><span style="font-family: Arial; font-size: 10pt;">• </span><span style="color: black; font-family: Arial; font-size: 10pt;">Fabricated devices successfully tested up to 500°C for temperature sensing applications.</span><p style="text-align: justify;"><span style="font-family: Arial; font-size: 10pt;">• </span><span style="color: black; font-family: Arial; font-size: 10pt;">Indium oxide (IO) and indium tin oxide (ITO) sensing layers were developed on the SAW devices using sputtering and sol-gel method.</span><p style="text-align: justify;"><span style="font-family: Arial; font-size: 10pt;">• </span><span style="color: black; font-family: Arial; font-size: 10pt;">IO- and ITO-functionalized langasite SAW reflective delay line devices were used for sensing H2 and O2 at 350°C. </span><br>
Surface Acoustic Wave Sensors for Chemical Sensing Applications
Monthly Colloquium, University of South Alabama, Mobile, Alabama, Nov 12, 2020
Demonstration of an Acoustoelectric Surface Acoustic Wave Circulator.
Abstract not provided.