Results 91 to 100 of about 2,243,893 (300)
Coded Shack-Hartmann Wavefront Sensor
, 2016 Wavefront sensing is an old yet fundamental problem in adaptive optics. Traditional wavefront sensors are limited to time-consuming measurements, complicated and expensive setup, or low theoretically achievable resolution. In this thesis, we introduce
Wang, Congli
core +1 more source
Optical Windows for Transcranial Brain Imaging in Living Mice: Skull Thinning, Clearing, and Beyond
Advanced Science, EarlyView.Longitudinal, noninvasive in vivo imaging is crucial for studying brain physiology. Advances in transcranial optical windows and multiphoton microscopy have improved imaging depth, but their performance often deteriorates over time. This work investigated various transcranial window approaches and found that skull regrowth limits image quality.
Yiming Fu +5 more
wiley +1 more source
Advanced Electronic Materials, EarlyView.A diagnostic method for reconfigurable intelligent surfaces (RIS) based on non‐uniform space‐time‐coding modulation is presented. Fault localization is achieved via amplitude‐only spectral measurements, eliminating the need for complex signal processing. A one‐to‐one mapping between harmonic components and RIS elements enables accurate detection.
Xiao Qing Chen +8 more
wiley +1 more source
An embedded adaptive optics real time controller [PDF]
, 2007 The design and realisation of a low cost, high speed control system for adaptive optics (AO) is presented. This control system is built around a field programmable gate array (FPGA).
Saunter, Christopher D. +1 more
core
Compensation of Non Common Path Aberrations on a pyramid wavefront sensor with an Adaptive Lens. [PDF]
, 2022 Closed loop systems based on the Pyramid wavefront sensor (P-WFS) can reach very high sensitivity respect to other wavefront sensors. The sensitivity increases as the Point Spread Function (PSF) on the tip of the pyramid gets smaller. Therefore, it is
Favazza, Paolo
core
Conformal Reconfigurable Intelligent Surfaces: A Cylindrical Geometry Perspective
Advanced Electronic Materials, EarlyView.Cylindrical reconfigurable intelligent surfaces are explored for low‐complexity beam steering using one‐bit meta‐atoms. A multi‐level modeling approach, including optimization‐based synthesis, demonstrates that even minimal hardware can support directive scattering.
Filippo Pepe +4 more
wiley +1 more source
Development of a wavefront sensor for terahertz pulses
Optics Express, 2016 Wavefront characterization of terahertz pulses is essential to optimize far-field intensity distribution of time-domain (imaging) spectrometers or increase the peak power of intense terahertz sources. In this paper, we report on the wavefront measurement of terahertz pulses using a Hartmann sensor associated with a 2D electro-optic imaging system ...
Abraham, Emmanuel +5 more
openaire +3 more sources
Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems
Advanced Electronic Materials, EarlyView.Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang +9 more
wiley +1 more source
Optics Express, 2018 This paper proposes a method used to calculate centroid for Shack-Hartmann wavefront sensor (SHWFS) in adaptive optics (AO) systems that suffer from strong environmental light and noise pollutions.
Ziqiang Li, Xinyang Li
semanticscholar +1 more source
High Sensitivity Wavefront Sensing with a Nonlinear Curvature Wavefront Sensor [PDF]
Publications of the Astronomical Society of the Pacific, 2010 18 pages, 11 figures.
openaire +2 more sources