Results 21 to 30 of about 5,505 (209)
Miniaturized Shack-Hartmann wavefront sensors for starbugs [PDF]
SPIE Proceedings, 2014 20 pages, 17 figures, to be published in the Proc. SPIE 9151 (2014)
Goodwin, Michael +6 more
openaire +2 more sources
Wavefront aberrations in aging measured with Hartmann-Shack at 3- and 5-mm pupil sizes. [PDF]
Optom Vis SciSIGNIFICANCE Visual acuity (VA) depends on many factors. When the goal is to assess retinal health rather than performance, then using a 3‐mm pupil reduces unwanted wavefront aberrations. The axis of astigmatism can still potentially change with age.
Clark CA, Parimi V, Elsner AE.
europepmc +2 more sources
Surface Measurement Using Compressed Wavefront Sensing
Photonic Sensors, 2018 Compressed sensing leverages the sparsity of signals to reduce the amount of measurements required for its reconstruction. The Shack-Hartmann wavefront sensor meanwhile is a flexible sensor where its sensitivity and dynamic range can be adjusted based on
Eddy Mun Tik Chow +3 more
doaj +1 more source
Atmosphere, 2021 A method to detect the atmospheric turbulent layers using a single Shack–Hartmann wavefront sensor is discussed. In order to determine the height distribution of the atmospheric turbulence above a telescope, we register the wavefront distortions at ...
Artem Yurievich Shikhovtsev +6 more
doaj +1 more source
Study of a MEMS-based Shack-Hartmann wavefront sensor with adjustable pupil sampling for astronomical adaptive optics [PDF]
, 2008 We introduce a Shack-Hartmann wavefront sensor for adaptive optics that enables dynamic control of the spatial sampling of an incoming wavefront using a segmented mirror microelectrical mechanical systems (MEMS) device.
Baranec, Christoph, Dekany, Richard
core +1 more source
Highly Stable Spatio-Temporal Prediction Network of Wavefront Sensor Slopes in Adaptive Optics
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
doaj +1 more source
Expanded Scene Image Preprocessing Method for the Shack–Hartmann Wavefront Sensor
Applied Sciences, 2023 Due to the influence of atmospheric turbulence, the detector, and background noise, the subaperture image of an extended scene Shack–Hartmann wavefront sensor will have a low signal-to-noise ratio, which will introduce errors to the offset estimation and
Bo Chen +4 more
doaj +1 more source
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
doaj +1 more source
Photonics, 2023 Atmospheric turbulence causes refractive index fluctuations, which in turn introduce extra distortions to the wavefront of the propagated radiation. It ultimately degrades telescope resolution (in imaging applications) and reduces radiation power density
Ilya Galaktionov +4 more
doaj +1 more source
Optical measurements of phase steps in segmented mirrors - fundamental precision limits [PDF]
, 2006 Phase steps are an important type of wavefront aberrations generated by large telescopes with segmented mirrors. In a closed-loop correction cycle these phase steps have to be measured with the highest possible precision using natural reference stars ...
Caianiello ER +6 more
core +1 more source