Results 1 to 10 of about 320 (173)

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, Lianqun Yao, Shuyun Wu, Gongchang Wang   +3 more
doaj   +3 more sources

Improved Wavefront Reconstruction and Correction Strategy for Adaptive Optics System With a Plenoptic Sensor

IEEE Photonics Journal, 2021
Wavefront reconstruction and correction under strong turbulence has become a crucial issue for adaptive optics systems. An approach using a plenoptic sensor has attracted high attention recently.
Jintian Hu, Tao Chen, Xudong Lin, Liang Wang, Qichang An, Zhichong Wang   +5 more
doaj   +3 more sources

Simulation Analysis of a Wavefront Reconstruction of a Large Aperture Laser Beam

Sensors, 2023
In order to solve the problem of atmospheric influence on the far-field measurement of the quality of a laser beam, we proposed a direct wavefront measurement system based on the Hartmann detection principle, which can measure large apertures and high ...
Gangyu Wang, Zaihong Hou, Laian Qin, Xu Jing, Yi Wu   +4 more
doaj   +3 more sources

Fast and Highly Accurate Zonal Wavefront Reconstruction from Multi-Directional Slope and Curvature Information Using Subregion Cancelation

Applied Sciences
The wavefront reconstruction is a crucial step in determining the performance of wavefront detection instruments. The wavefront reconstruction algorithm is primarily evaluated in three dimensions: accuracy, speed, and noise immunity.
Shuhao Liu, Hui Zhong, Yanqiu Li, Ke Liu
doaj   +3 more sources

Influence of Image Processing Method on Wavefront Reconstruction Accuracy of Large-Aperture Laser

Photonics, 2023
In order to improve the wavefront reconstruction accuracy of a large-aperture laser, this paper proposed an adaptive window preprocessing algorithm based on the threshold center of gravity method (AW-TCoG).
Gangyu Wang, Zaihong Hou, Laian Qin, Xu Jing, Yang Li, Yi Wu   +5 more
doaj   +1 more source

A Method Used to Improve the Dynamic Range of Shack–Hartmann Wavefront Sensor in Presence of Large Aberration

Sensors, 2022
With the successful application of the Shack–Hartmann wavefront sensor in measuring aberrations of the human eye, researchers found that, when the aberration is large, the local wavefront distortion is large, and it causes the spot corresponding to the ...
Wen Yang, Jianli Wang, Bin Wang
doaj   +1 more source

Method for distortion correction of multi-layered surface reconstruction using time-gated wavefront sensing approach [PDF]

Journal of the European Optical Society-Rapid Publications, 2013
In order to estimate the multi-layer surface profile and to detect the inter-layer surfaces defects, gated wavefront sensing approach has been proposed in the previous works [1, 2].
Tan C. S., Wang X., Ng Y. H., Lim W. K., Chai T. Y.   +4 more
doaj   +1 more source

Performance Characterization of Deep-Phase-Retrieval Shack-Hartmann Wavefront Sensors

IEEE Photonics Journal, 2023
Shack-Hartmann wavefront sensor (SHWFS) is the most popular wavefront sensor in adaptive optics systems. The Deep-Phase-Retrieval Wavefront Reconstruction (DPRWR) method, which was proposed by our group previously, is a kind of deep learning-based ...
Manting Zhang, Youming Guo
doaj   +1 more source

Wavefront measurement method based on improved light field camera

Results in Physics, 2020
The light field camera is used in the wavefront sensing field because of its simple structure, large field of view, high utilization rate of light energy, etc.
Xin Chen, Wenke Xie, Haotong Ma, Junqiu Chu, Bo Qi, Ge Ren, Xuecheng Sun, Fanglin Chen   +7 more
doaj   +1 more source

Defocused Image Deep Learning Designed for Wavefront Reconstruction in Tomographic Pupil Image Sensors

Mathematics, 2020
Mathematical modelling methods have several limitations when addressing complex physics whose calculations require considerable amount of time. This is the case of adaptive optics, a series of techniques used to process and improve the resolution of ...
Sergio Luis Suárez Gómez, Francisco García Riesgo, Carlos González Gutiérrez, Luis Fernando Rodríguez Ramos, Jesús Daniel Santos   +4 more
doaj   +1 more source