Results 1 to 10 of about 2,018,276 (235)
A Method Used to Improve the Dynamic Range of Shack–Hartmann Wavefront Sensor in Presence of Large Aberration [PDF]
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
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An all-photonic focal-plane wavefront sensor [PDF]
Nature Communications, 2020 Adaptive optics wavefront sensors need to be in a pupil plane and are insensitive to certain wavefront-error modes. The authors present a wavefront sensor based on a photonic lantern fibre-mode-converter and deep learning, which can be placed at the same
Barnaby R. M. Norris +4 more
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Wavefront sensor-less adaptive optics using deep reinforcement learning. [PDF]
Biomed Opt Express, 2021 Image degradation due to wavefront aberrations can be corrected with adaptive optics (AO). In a typical AO configuration, the aberrations are measured directly using a Shack-Hartmann wavefront sensor and corrected with a deformable mirror in order to ...
Durech E +3 more
europepmc +2 more sources
Light: Advanced Manufacturing, 2022 Adaptive optics systems are used to compensate for wavefront distortions introduced by atmospheric turbulence. The distortions are corrected by an adaptable device, normally a deformable mirror.
Andreas Zepp +3 more
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Shack-Hartmann wavefront sensor optical dynamic range. [PDF]
Opt Express, 2021 The widely used lenslet-bound definition of the Shack-Hartmann wavefront sensor (SHWS) dynamic range is based on the permanent association between groups of pixels and individual lenslets. Here, we formalize an alternative definition that we term optical
Akondi V, Dubra A.
europepmc +2 more sources
Wavefront image sensor chip [PDF]
Optics Express, 2010 We report the implementation of an image sensor chip, termed wavefront image sensor chip (WIS), that can measure both intensity/amplitude and phase front variations of a light wave separately and quantitatively.
Cui, Xiquan +3 more
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Sub-Millisecond Phase Retrieval for Phase-Diversity Wavefront Sensor. [PDF]
Sensors (Basel), 2020 We propose a convolutional neural network (CNN) based method, namely phase diversity convolutional neural network (PD-CNN) for the speed acceleration of phase-diversity wavefront sensing.
Wu Y, Guo Y, Bao H, Rao C.
europepmc +2 more sources
Highly Stable Spatio-Temporal Prediction Network of Wavefront Sensor Slopes in Adaptive Optics [PDF]
Sensors, 2023 Adaptive Optics (AO) technology is an effective means to compensate for wavefront distortion, but its inherent delay error will cause the compensation wavefront on the deformable mirror (DM) to lag behind the changes in the distorted wavefront ...
Ning Wang +6 more
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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 +4 more
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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 ShackHartmann has a major disadvantage for extended
Dekany, Richard +2 more
core +4 more sources