Polarization and absorption effects on the Fraunhofer diffraction patterns of a corner reflector
Polarization and absorption effects on Fraunhofer diffraction patterns of corner reflector
REFLECTOR↗
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Results for “diffraction”
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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Adsorption of atoms and molecules upon the surface of a single crystal and chemical reactions that take place upon the surface /low energy electron diffraction/ Annual progress report, 1966-1967
Low energy electron diffraction research of chemical interactions of gases with single crystal metal surfaces, and gas adsorption on nickel and tungsten surfaces
GAS-METAL INTERACTION↗
Edge diffraction from truncated paraboloids and hyperboloids
Edge diffraction from truncated parabolic and hyperbolic reflectors
OPTICS↗
Aperture reflection coefficient of a parallel- plate waveguide by wedge diffraction analysis
Aperture reflection coefficient of parallel plate waveguide by wedge diffraction analysis
DIFFRACTION↗
Electron diffraction control studies of Venus Flytrap particles
Electron diffraction patterns of olivine and enstatite as control study for Venus Fly Trap rocket experiments
ELECTRON DIFFRACTION↗
Numerical results for the diffraction of a normal shock wave by a sphere and for the subsequent transient flow
Finite difference method to obtain numerical results on normal shock wave diffraction by sphere and subsequent transient flow
DIFFRACTION↗
Theoretical performance of solar cell space power systems using spectral dispersion. II - Dispersion by diffraction gratings
Calculated potential increase in solar cell array conversion efficiency with dispersion by diffraction grating
DIFFRACTION GRATING↗
Focusing hologram diffraction grating.
Interferometer producing focusing hologram diffraction grating, noting photograph of spectrum
SPECTROGRAPHY↗
X-ray diffraction analysis of cohenite from iron meteorites.
Cohenite grains from iron meteorites studied by X-ray diffraction for establishing pressure scale, using solid state recrystallization
X-RAY DIFFRACTION↗
The diffraction of H.F. radio waves by ionospheric irregularities.
Diffraction of HF radio waves by ionospheric layer containing field-aligned inhomogeneities
FIELD-ALIGNED IRREGULARITY /FAI/↗
Selected-area small-angle electron diffraction.
Selected-area small angle electron diffraction using double-condenser electron microscope, noting high resolution power
ELECTRON MICROSCOPE↗
Diffractive optics for particle velocimetry and sizing
Beam-shaping diffractive optical elements are used to create structured light patterns in fluid flows. Particle scattering results in detected signals that can be used to determine the particle size and velocity.
diffractive optics laser velocimetry↗
Diffractive Optical Elements for Spectral Imaging
Diffractive optical elements fabricated on flat and non-flat substrates frequently act as dispersive elements in imaging spectrometers. We describe the design and electron-beam fabrication of blazed and computer-generated-hologram gratings for slit and tomographic imaging spectrometers.
diffractive optics gratings spectral imaging imagi↗
Diffractive Optic Fluid Shear Stress Sensor
Light scattering off particles flowing through a two-slit inteference pattern can be used to measure the shear stress of the fluid. We have designed and fabricated a miniature diffractive optic sensor based on this principle.
fluid shear stress micro sensor non-invasive senso↗
Diffractive Optical Elements for Spectral Imaging
Diffractive optical elements fabricated on flat and non-flat substrates frequently act as dispersive elements in imaging spectrometers. We describe the design and electron-beam fabrication of blazed and computer-generated-hologram gratings for slit and tomographic imaging spectrometer.
diffractive optics gratings spectral imaging imagi↗
Diffractive Optic Fluid Shear Stress Sensor
Light scattering off particles flowing through a two-slit interference pattern can be used to measure the shear stress of the fluid. We have designed and fabricated a miniature diffractive optic sensor based on this principle.
optics↗
Diffraction Modeling of Finite Subband EFC Probing on Dark Hole Contrast with WFIRST-CGI Shaped Pupil Coronagraph
The current NASA WFIRST (Wide-Field InfraRed Survey Telescope) coronagraph instrument (CGI) design allocates two subband filters per each full science band in order to contain system complexity and cost. We present our detailed investigation results on the adequacy of such a limited number of finite subband filters in achieving broadband dark hole contrast with a shaped pupil coronagraph (SPC). The study is based on diffraction propagation modeling with realistic WFIRST optics, where each subband’s image plane electric field is estimated from pairwise pupil plane deformable mirror (DM) probing and image plane intensity averaging of the resulting fields of multiple (subband) wavelengths. Multiple subband choices and probing and control strategies are explored, including standard subband probing; mixed wavelength and/or weighted Jacobian matrix; subband probing with intensity subtraction; and extended subband probing with intensity subtraction. Overall, the investigation shows that the achievable contrast with a limited number of finite subbands is about 2~2.5x worse than the designed contrast for the current SPC. The result suggests that future shaped pupil designs should be optimized for slightly broader bandwidths than the intended science bandpasses if limited subbands are used for wavefront sensing via probing.
WFIRST↗
Application of a large space-based diffractive optical element telescope to the Terrestrial Planet-Finder Mission: design and tolerance issues
An analytical description of the scattered light from a 10 meter diameter Diffractive Optical Element lens-based telescope operating at 1 micron wavelength has been formulated.
DOE↗