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Results for “BACKSCATTERING”
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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Measurement of Aerodynamic Roughness Using Radar Backscatter Over Vegetated Surfaces
This paper describes a potential mechanism for remotely inferring the wind regime by using synthetic-aperture radar data to describe the roughness of the surface, and describes a project to estimate the practicality of such a mechanism.
Change Monitoring of Antarctic Sea Ice Using NSCAT Dual-Polarized Backscatter Measurements
Polar sea ice characteristics and the timing of seasonal transitions are important parameters in the study of polar processes and climate changes.
NDE of Hidden Flaws in Aging Aircraft Structures Using Obliquely Backscattered Ultrasonic Signals (OBUS)
Corrosion is a relatively slow material degradation process to which metallic structures of aircraft are subjected during service and it can appear in many forms.
Post-Mortem Characterization of Shocked Cu-Be Interfaces Using Electron Backscattered Diffraction (EBSD)
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Miniature recoil ion mass spectrometer enables correlative elemental isotopic and backscatter analysis from solid nanovolumes
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Convolutional neural network-based method for real-time orientation indexing of measured electron backscatter diffraction patterns
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Study of Chromium Migration in a Nickel-Based Alloy Using Polarized Neutron Reflectometry and Rutherford Backscattering Spectrometry
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Backscattering silicon spectrometer (BASIS): sixteen years in advanced materials characterization
A broad spectrum of materials that BASIS has explored to resolve the dynamics from pico- to nano-seconds using the quasielastic neutron scattering technique.
Preliminary measurements of the edge magnetic field pitch from 2-D Doppler backscattering in MAST and NSTX-U (invited)
The Synthetic Aperture Microwave Imaging (SAMI) system is a novel diagnostic consisting of an array of 8 independently phased antennas. At any one time, SAMI operates at one of the 16 frequencies in the range 10-34.5 GHz. The imaging beam is steered in software post-shot to create a picture of the entire emission surface. In SAMI’s active probing mode of operation, the plasma edge is illuminated with a monochromatic source and SAMI reconstructs an image of the Doppler back-scattered (DBS) signal. By assuming that density fluctuations are extended along magnetic field lines, and knowing that the strongest back-scattered signals are directed perpendicular to the density fluctuations, SAMI’s 2-D DBS imaging capability can be used to measure the pitch of the edge magnetic field. In this paper, we present preliminary pitch angle measurements obtained by SAMI on the Mega Amp Spherical Tokamak (MAST) at Culham Centre for Fusion Energy and on the National Spherical Torus Experiment Upgrade at Princeton Plasma Physics Laboratory. Lastly, the results demonstrate encouraging agreement between SAMI and other independent measurements.
Surface registration using a multi-beam optical probe and backscatter reflectometer
We introduce a technique for locating the position and orientation of an object surrounding a compound optical probe. The probe allows for simultaneous measurement of 150 points of laser velocimetry, and prior to a dynamic experiment it is important to know the initial position of the surface. Using an optical switch and a Luna OBR rangefinder, we measure the surface distance at hundreds of locations. These measurements are then combined with a dimensional inspection of the object and analysis routines to report the orientation and location of the inner surface relative to the probe. In addition, we present a technique to simultaneously measure the beam paths using a reference hemispherical surface and a number of distance measurements.
Modeling stimulated Brillouin backscatter from the inner laser cones during indirect drive inertial confinement fusion experiments at the National Ignition Facility
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Stimulated Raman backscattering from a laser wakefield accelerator
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