Results 81 to 90 of about 99,918 (270)
Validating Forward Modeling and Inversions of Helioseismic Holography Measurements
, 2018 Here we use synthetic data to explore the performance of forward models and inverse methods for helioseismic holography. Specifically, this work presents the first comprehensive test of inverse modeling for flows using lateral-vantage (deep-focus ...
Birch, A. C. +4 more
core +1 more source
Compressive Holographic Video [PDF]
, 2016 Compressed sensing has been discussed separately in spatial and temporal domains. Compressive holography has been introduced as a method that allows 3D tomographic reconstruction at different depths from a single 2D image.
Chen, Huaijin +6 more
core +5 more sources
Advanced Science, EarlyView.A single‐cell metasurface is designed to multiplex holographic images across both spin and wavelength channels using a single‐phase map. By employing inverse design and automatic differentiation, the metasurface achieves 36 channel multiplexing across the visible to near‐infrared spectrum.
Cherry Park, Youngsun Jeon, Junsuk Rho
wiley +1 more source
, 1999 The identification of a causal-connection scale motivates us to propose a new covariant bound on entropy within a generic space-like region. This "causal entropy bound", scaling as the square root of EV, and thus lying around the geometric mean of ...
A. Buonanno +24 more
core +2 more sources
Advanced Science, EarlyView.This study introduces a lens‐free digital holography (LDH) method for detecting metal impurities in lead‐acid battery electrolytes. Using a green LED and CMOS camera, the technique captures holograms and analyzes reconstruction distances and gray‐scale differences.
Liang Xue +5 more
wiley +1 more source
Imaging biological tissue with high-throughput single-pixel compressive holography
Nature Communications, 2021 Single-pixel holography generates holographic images with a single-pixel detector making this relatively inexpensive. Here the authors report a high-throughput single-pixel compressive holography method for imaging biological tissue which can either ...
Daixuan Wu +7 more
doaj +1 more source
Advanced Science, EarlyView.Reconfigurable metasurfaces typically require human intervention or complex, resource‐heavy processes. This innovative self‐adaptive metasurface senses an incident wave's direction, adjusting reflection in real‐time using a simple electronics module. It eliminates external controllers, reducing response time, energy consumption, and costs. Applications
Bo‐Wen Ren +4 more
wiley +1 more source
Vibration testing and analysis using holography [PDF]
, 1971 Time average holography is useful in recording steady state vibrational mode patterns. Phase relationships under steady state conditions are measured with real time holography and special phase shifting techniques.
core +1 more source
Polarization Decoupling Multi‐Port Beam‐Splitting Metasurface for Miniaturized Magneto‐Optical Trap
Advanced Science, EarlyView.A meta‐device‐based six‐beam delivery system is proposed for miniaturized MOT, featuring a novel polarization decoupling multi‐port beam‐splitting (PD‐MPBS) metasurface using propagation and geometric phases. The fabricated PD‐MPBS samples exhibit high beam‐splitting power uniformity (within 4.4%) and polarization purities (91.3–93.2%).
Tian Tian +7 more
wiley +1 more source
Open Physics, 2019 This paper presents an evaluation of the realism of a full-color reflection H2 analog hologram recorded on ultra-fine-grain silver-halide material. An H2 hologram is a transplane image that is different from the well-known Denisyuk hologram in which the ...
Gentet Philippe +3 more
doaj +1 more source