Results 41 to 50 of about 3,571 (136)

Efficient decoding of 2D structured illumination with linear phase stepping in X-ray phase contrast and dark-field imaging. [PDF]

PLoS ONE, 2014
The ability to map the phase distribution and lateral coherence of an x-ray wavefront offers the potential for imaging the human body through phase contrast, without the need to deposit significant radiation energy. The classic means to achieve this goal
Katherine J Harmon, Eric E Bennett, Andrew A Gomella, Han Wen   +3 more
doaj   +1 more source

Comparison of Wavefront Sensing Methods for Solar Ground-Layer Adaptive Optics: Multi-Direction Averaging and Wide-Field Correlation

Photonics
Solar ground-layer adaptive optics (GLAO) is widely recognized as a key technology for achieving high-resolution, wide-field imaging in ground-based solar telescopes. However, the accuracy differences among various wavefront sensing methods in solar GLAO
Yuhe Liu, Ziming Li, Qianhan Zhou, Nanfei Yan, Xian Ran, Ao Tang, Zhen Li, Lanqiang Zhang, Changhui Rao   +8 more
doaj   +1 more source

Study of Point Scanning Detection Mechanisms for Vibration Signals with Wavefront Sensors

Photonics
Seismic wave laser remote sensing is extensively employed in seismic monitoring and resource exploitation. This work establishes a vibration signal point scanning detection system utilizing wavefront sensors, leveraging their high resolution, array ...
Quan Luo, Hongsheng Luo, Yiyou Fan, Guihan Wu, Haoming Chen, Yun Pan, Wei Jiang, Jinshan Su   +7 more
doaj   +1 more source

Modulated Differential Wavefront Sensing: Alignment Scheme for Beams with Large Higher Order Mode Content

Galaxies, 2020
Modulated differential wavefront sensing (MDWS) is an alignment control scheme in the regime of beams with strong higher order transversal modes (HOMs). It is based on the differential wavefront sensing (DWS) technique.
A. Bisht, M. Prijatelj, J. Leong, E. Schreiber, C. Affeldt, M. Brinkmann, S. Doravari, H. Grote, V. Kringel, J. Lough, H. Lueck, K. Strain, M. Weinert, H. Wittel, K. Danzmann   +14 more
doaj   +1 more source

Dark Wavefront Sensing

, 2015
The concepts and considerations that could leads to the development of a novel kind of classes of wavefront sensors inwhich the information is retrieved by the absence of photons rather than from their presence are shown. In quantumoptics the concept of ”sensing” an object without actually having photons interacting with it is already known ...
openaire   +3 more sources

Higher-resolution wavefront sensing based on sub-wavefront information extraction

Frontiers in Physics
The limited spatial sampling rates of conventional Shack–Hartmann wavefront sensors (SHWFSs) make them unable to sense higher-order wavefront distortion.
Hongli Guan, Hongli Guan, Hongli Guan, Hongli Guan, Wang Zhao, Wang Zhao, Wang Zhao, Shuai Wang, Shuai Wang, Shuai Wang, Kangjian Yang, Kangjian Yang, Kangjian Yang, Mengmeng Zhao, Mengmeng Zhao, Mengmeng Zhao, Shenghu Liu, Shenghu Liu, Shenghu Liu, Shenghu Liu, Han Guo, Han Guo, Han Guo, Ping Yang, Ping Yang, Ping Yang   +25 more
doaj   +1 more source

An Optical Wavefront Sensor Based on a Double Layer Microlens Array

Sensors, 2011
In order to determine light aberrations, Shack-Hartmann optical wavefront sensors make use of microlens arrays (MLA) to divide the incident light into small parts and focus them onto image planes.
Hsiang-Chun Wei, Guo-Dung John Su, Hsin-Ta Hsieh, Vinna Lin   +3 more
doaj   +1 more source

Breaking Boundaries: A Universal Wavefront Reconstruction Approach for High-resolution Solar Imaging

The Astrophysical Journal Letters
This Letter proposes a universal wavefront reconstruction approach based on a coupled data set and neural network, aiming to overcome the limitations of current algorithms in terms of universality and wavefront sensing accuracy for variable imaging ...
Xinlan Ge, Licheng Zhu, Zeyu Gao, Shiqing Ma, Ao Li, Shuai Wang, Ping Yang   +6 more
doaj   +1 more source

Design considerations for wavefront sensing with self-referencing interferometers in adaptive optics systems

Journal of the European Optical Society-Rapid Publications
In this work, we show the design and implementation of wavefront sensing with a self-referencing interferometer (SRI). The SRI is developed to aid adaptive optics (AO) control, via deformable mirrors, in correcting wavefront error from atmospheric ...
MacGillivray Alexander C., Hristovski Ilija R., Jenne Matthias F., Reeves Andrew P., Mata Calvo Ramon, Holzman Jonathan F.   +5 more
doaj   +1 more source

Fake tilts in differential wavefront sensing

Optics Express, 2019
Two-beam interferometry is a tool of high-precision length-metrology, where displacements are measured to within sub-nanometer resolution and accuracy. Differential wavefront sensing - via phase detection by segmented photodiodes - adds the capability of simultaneously measuring the target translation and rotation.
Massa, Enrico, Sasso, Carlo Paolo, Mana, Giovanni   +2 more
openaire   +3 more sources