Results 71 to 80 of about 106,212 (345)
MORPHOLOGICAL DESCRIPTIONS USING THREE-DIMENSIONAL WAVEFRONTS
Image Analysis and Stereology, 2011 The present study deals with the analysis of three-dimensional binary objects whose structure is not obvious nor generally clearly visible. Our approach is illustrated through three examples taken from biological microscopy.
Jean Serra
doaj +1 more source
Wavefront Reconstruction of Shack-Hartmann with Under-Sampling of Sub-Apertures
Photonics, 2023 Shack-Hartmann wavefront sensor plays a key role in adaptive optics (AO) systems, which detect the aberrant wavefront by an array of micro-lenslets across the aperture pupil.
Jian Huang +3 more
doaj +1 more source
Numerical estimation of the curvature of a light wavefront in a weak gravitational field [PDF]
Class.Quant.Grav.26:235004,2009, 2009 The geometry of a light wavefront evolving in the 3--space associated with a post-Newtonian relativistic spacetime from a flat wavefront is studied numerically by means of the ray tracing method. For a discretization of the bidimensional wavefront the surface fitting technique is used to determine the curvature of this surface at each vertex of the ...
arxiv +1 more source
Possible Application of Wavefront Coding to the LSST [PDF]
, 2006 Wavefront Coding has been applied as a means to increase the effective depth of focus of optical systems. In this note I discuss the potential for this technique to increase the depth of focus of the LSST and the resulting advantages for the construction
/SLAC, Langeveld, Willy
core +3 more sources
Energy Focusing Metasurface Based Wireless Power Transfer System for Compact Unmanned Mobilities
Advanced Optical Materials, EarlyView.A miniaturized wireless power transfer system integrates a metasurface lens, microstrip patch antenna, and RF‐CMOS rectifier to enhance mmWave reception efficiency and reduce size. Leveraging mmWave short wavelengths, it achieves high gain on small platforms. The system's polarization independence and wide‐angle reception ensure robust performance.
Wonwoo Lee +7 more
wiley +1 more source
Achieving Directive Radiation and Broadband Microwave Absorption by an Anisotropic Metasurface
IEEE Access, 2019 Simultaneously integrating electromagnetic absorption and wavefront-shaping into a single metasurface with flat and low profile is crucial for many practical applications both in science and engineering community. Here, by introducing lossy components to
Jun Sun +6 more
doaj +1 more source
Wavefront sensor and wavefront corrector matching in adaptive optics
Optics Express, 2007 Matching wavefront correctors and wavefront sensors by minimizing the condition number and mean wavefront variance is proposed. The particular cases of two continuous-sheet deformable mirrors and a Shack-Hartmann wavefront sensor with square packing geometry are studied in the presence of photon noise, background noise and electronics noise.
openaire +3 more sources
Optical wavefront phase-tilt measurement using Si-photonic waveguide grating couplers [PDF]
arXiv, 2023 Silicon photonic wavefront phase-tilt sensors for wavefront monitoring using surface coupling grating arrays are demonstrated. The first design employs the intrinsic angle dependence of the grating coupling efficiency to determine local wavefront tilt, with a measured sensitivity of 7 dB/degree.
arxiv
Angle‐ and Polarization‐Tolerant Metasurface Designs Based on the Aperiodic Tiling
Advanced Optical Materials, EarlyView.A novel aperiodic metasurface design is introduced to mitigate the inherent angle and polarization sensitivity of conventional metasurfaces. By employing a recently discovered aperiodic tiling approach, identical elliptical scatterers are arranged with systematic variations in their spacing and orientation, effectively minimizing spectral reflectance ...
Minyeul Lee, Suwan Jeon, Jonghwa Shin
wiley +1 more source
Breaking of Wavelength-Dependence in Holographic Wavefront Sensors Using Spatial-Spectral Filtering
Sensors, 2023 Nowadays, wavefront sensors are widely used to control the shape of the wavefront and detect aberrations of the complex field amplitude in various fields of physics. However, almost all of the existing wavefront sensors work only with quasi-monochromatic
Nikita Stsepuro +3 more
doaj +1 more source