Results 1 to 10 of about 43,714 (202)

Experimental wavefront sensing techniques based on deep learning models using a Hartmann-Shack sensor for visual optics applications. [PDF]

Sci Rep
Wavefront sensing is essential in visual optics for evaluating the optical quality in systems, such as the human visual system, and understanding its impact on visual performance. Although traditional methods like the Hartmann-Shack wavefront sensor (HSS)
Ramírez-Quintero JS, Osorno-Quiroz A, Torres-Sepúlveda W, Mira-Agudelo A.   +3 more
europepmc   +3 more sources

A Method Used to Improve the Dynamic Range of Shack-Hartmann Wavefront Sensor in Presence of Large Aberration. [PDF]

Sensors (Basel), 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 ...
Yang W, Wang J, Wang B.
europepmc   +2 more sources

Detection of phase singularities with a Shack-Hartmann wavefront sensor [PDF]

, 2006
While adaptive optical systems are able to remove moderate wavefront distortions in scintillated optical beams, phase singularities that appear in strongly scintillated beams can severely degrade the performance of such an adaptive optical system ...
Aksenov, Arrasmith, Barchers, Coullet, Filippus S. Roux, Fried, Fried, Hattori, Herrmann, Herrmann, Hudgin, Jan C. Olivier, Mingzhou Chen, Nye, Roggemann, Roux, Southwell, Talmi, Tyler, van Dam   +19 more
core   +2 more sources

Impact of CMOS Pixel and Electronic Circuitry in the Performance of a Hartmann-Shack Wavefront Sensor [PDF]

Sensors, 2018
This work presents a numerical simulation of a Hartmann-Shack wavefront sensor (WFS) that assesses the impact of integrated electronic circuitry on the sensor performance, by evaluating a full detection chain encompassing wavefront sampling ...
Úrsula Vasconcelos Abecassis, Davies William de Lima Monteiro, Luciana Pedrosa Salles, Carlos Augusto de Moraes Cruz, Pablo Nunes Agra Belmonte   +4 more
doaj   +2 more sources

Deep and clear optical imaging of thick inhomogeneous samples. [PDF]

PLoS ONE, 2012
Inhomogeneity in thick biological specimens results in poor imaging by light microscopy, which deteriorates as the focal plane moves deeper into the specimen.
Raphael Jorand, Gwénaële Le Corre, Jordi Andilla, Amina Maandhui, Céline Frongia, Valérie Lobjois, Bernard Ducommun, Corinne Lorenzo   +7 more
doaj   +6 more sources

Compressive Shack-Hartmann Wavefront Sensor based on Deep Neural Networks [PDF]

, 2020
The Shack-Hartmann wavefront sensor is widely used to measure aberrations induced by atmospheric turbulence in adaptive optics systems. However if there exists strong atmospheric turbulence or the brightness of guide stars is low, the accuracy of wavefront measurements will be affected.
Peng Jia, Mingyang Ma, Dongmei Cai, Weihua Wang, Juanjuan Li, Can Li   +5 more
arxiv   +3 more sources

Using the generalised-optical differentiation wavefront sensor for laser guide star wavefront sensing [PDF]

arXiv, 2020
Laser guide stars (LGS) are used in many adaptive optics systems to extend sky coverage. The most common wavefront sensor used in combination with a LGS is a Shack-Hartmann wavefront sensor (SHWFS). The Shack-Hartmann has a major disadvantage for extended source wavefront sensing because it directly samples the image.
Dekany, Richard, Haffert, Sebastiaan Y., Keller, Christoph U.   +2 more
arxiv   +6 more sources

Testing and characterization of challenging optics and optical systems with Shack Hartmann wavefront sensors [PDF]

EPJ Web of Conferences, 2019
The Shack-Hartman wavefront sensor is a common metrology tool in the field of laser, adaptive optics and astronomy. However, this technique is still scarcely used in optics and optical system metrology.
Siv Julie, Mayer Rafael, Beaugrand Guillaume, Tison Guillaume, Juvénal Rémy, Dovillaire Guillaume   +5 more
doaj   +2 more sources

Error reduction method for singularity point detection using Shack–Hartmann wavefront sensor [PDF]

, 2013
A new framework is proposed for realizing high-spatial-resolution detection of singularity points in optical vortex beams using a Shack–Hartmann wavefront sensor (SHWS). The method uses a Shack–Hartmann wavefront sensor (SHWS) to record a Hartmanngram. A
Huang, Chenxi, Huang, Hongxin, Inoue, Takashi, Liu, Huafeng, Toyoda, Haruyoshi, Zhang, Heye   +5 more
core   +2 more sources

Correction of wavefront rotation between interferometer and shack-hartmann sensor using bending modes [PDF]

Journal of the European Optical Society-Rapid Publications, 2020
In some active optics system, the influence function, which is the surface deformation ability of an actuator, is measured by directly detecting the mirror surface using an interferometer and the surface correction of the primary mirror is done using the
Yi Zhu, Tao Chen, Hongzhuang Li
doaj   +2 more sources