Results 21 to 30 of about 2,844,522 (254)

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   +1 more source

Centroid-Predicted Deep Neural Network in Shack-Hartmann Sensors

IEEE Photonics Journal, 2022
The Shack-Hartmann wavefront sensor produces incorrect wavefront measurements when some sub-spots are weak and missing. In this paper, a method is proposed to predict the centroids of these sub-spots for the Shack-Hartmann wavefront sensor based on the ...
Mengmeng Zhao, Wang Zhao, Shuai Wang, Ping Yang, Kangjian Yang, Haiqi Lin, Lingxi Kong   +6 more
doaj   +1 more source

Supplementary document for Detecting momentum weak value: Shack–Hartmann versus weak measurement wavefront sensor - 5370310.pdf

, 2021
A derivation of an equation and technical details of weak measurement wavefront ...
Yi Zheng (113896), Jin-Shi Xu (5181443), Guang-can Guo (1235400), Chuanfeng Li (411368), Zheng-Hao Liu (8197890), Mu Yang (170922)   +5 more
core   +1 more source

Simultaneous quantification of longitudinal and transverse ocular chromatic aberrations with Hartmann–Shack wavefront sensor [PDF]

Journal of Innovative Optical Health Sciences, 2018
A simple method to objectively and simultaneously measure eye’s longitudinal and transverse chromatic aberrations was proposed. A dual-wavelength wavefront measurement system using two Hartmann–Shack wavefront sensors was developed. The wavefronts of the
Yangchun Deng, Junlei Zhao, Yun Dai, Yudong Zhang   +3 more
doaj   +1 more source

Fast holographic scattering compensation for deep tissue biological imaging

Nature Communications, 2021
Wavefront shaping is used to overcome scattering in biological tissues during imaging, but determining the compensation is slow. Here, the authors use holographic phase stepping interferometry, where new phase information is updated after each ...
Molly A. May, Nicolas Barré, Kai K. Kummer, Michaela Kress, Monika Ritsch-Marte, Alexander Jesacher   +5 more
doaj   +1 more source

Calibrating CGH Substrate TWE and Simulating Adjustment Error in Cylindrical Surface Measurement

IEEE Photonics Journal, 2022
Computer-generated hologram (CGH) is a diffractive optical element that has been commonly used as wavefront corrector in the interferometer and can be accurately manufactured to meet the requirements of high-precision detection.
Linghua Zhang, Sen Han, Xianyu Wu, Xianhao Qi, Jun Cheng, Chunfeng Xu   +5 more
doaj   +1 more source

Depth-Resolved Wavefront Aberrations using a Coherence-Gated Shack-Hartmann Wavefront Sensor [PDF]

, 2010
In the present paper we investigate the possibility of narrowing the depth range of a physical Shack - Hartmann (SH) wavefront sensor (WFS) by using coherence gating.
Tuohy, Simon, Podoleanu, Adrian G.H.
core   +1 more source

Adaptive particle image velocimetry based on sharpness metrics

Journal of the European Optical Society-Rapid Publications, 2018
Background Optical distortions can significantly deteriorate the measurement accuracy in particle image velocimetry systems. Such distortions can occur at fluctuating phase boundaries during flow measurement and result from the accompanied refractive ...
M. Teich, J. Grottke, H. Radner, L. Büttner, J. W. Czarske   +4 more
doaj   +1 more source

Quantitative X-ray Channel-Cut Crystal Diffraction Wavefront Metrology Using the Speckle Scanning Technique

Sensors, 2020
A speckle-based method for the X-ray crystal diffraction wavefront measurement is implemented, and the slope errors of channel-cut crystals with different surface characteristics are measured.
Lian Xue, Hongxin Luo, Qianshun Diao, Fugui Yang, Jie Wang, Zhongliang Li   +5 more
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