Results 31 to 40 of about 19,057 (261)
On-sky demonstration of low-order wavefront sensing and control with focal plane phase mask coronagraphs [PDF]
, 2015 The ability to characterize exoplanets by spectroscopy of their atmospheres requires direct imaging techniques to isolate planet signal from the bright stellar glare.
Baudoz, Pierre +8 more
core +5 more sources
Ultra-High Resolution Optical Aberrometry in Patients with Keratoconus: A Cross-Sectional Study
Ophthalmology and Therapy, 2023 Introduction This study performs optical aberration assessment in patients using a novel ultra-high-resolution device. The objective of this study is to analyze optical aberrations, especially the very high order wavefront (more than 10th order of ...
Gonzalo Velarde-Rodriguez +7 more
doaj +1 more source
Research on a Decoupling Algorithm for the Dual-Deformable-Mirrors Correction System
Applied Sciences, 2023 Wavefront distortion caused by atmospheric turbulence can be described as different types of aberrations, such as piston, tilt, defocusing, astigmatism, coma and so on.
Jingyuan Liang +3 more
doaj +1 more source
Higher order aberrations of the eye: Part two
African Vision and Eye Health, 2016 This article is the second in a series of two articles, which provides a discussion of the factors that may possibly contribute to variable results when wavefront aberrations of the human eye are measured.
Marsha Oberholzer +2 more
doaj +1 more source
Adaptive Detection of Wave Aberrations Based on the Multichannel Filter
Photonics, 2022 An adaptive method for determining the type and magnitude of aberration in a wide range is proposed on the basis of an optical processing of the analyzed wavefront using a multichannel filter matched to the adjustable Zernike phase functions.
Pavel A. Khorin +2 more
doaj +1 more source
Lensless Scheme for Measuring Laser Aberrations Based on Computer-Generated Holograms
Sensors, 2020 All of the existing holographic wavefront sensors are either bulky or have low accuracy of measuring wavefront aberrations. In this paper, we present an improvement of the holographic method of measuring wavefront aberrations using computer-generated ...
George Krasin +4 more
doaj +1 more source
A direct comparison between a MEMS deformable mirror and a liquid crystal spatial light modulator in signal-based wavefront sensing [PDF]
Journal of the European Optical Society-Rapid Publications, 2013 Aberrations degrade the performance of optical systems in terms of resolution and signal-to-noise ratio. This work explores the feasibility of a signal-based wavefront sensor, which employs a search algorithm to estimate Zernike coefficients of given ...
Jewel A. R., Akondi V., Vohnsen B.
doaj +1 more source
Calibration and performance evaluation of a monomorph deformable mirror
Results in Optics, 2022 To achieve diffraction-limited performance with a 50 cm solar telescope at the Udaipur solar observatory the development of a high-order adaptive optics (AO) system is currently in progress. The system includes a monomorph deformable mirror (MDM) with 85
A. Raja Bayanna +3 more
doaj +1 more source
Predicting visual acuity from wavefront aberrations
Journal of Vision, 2008 It is now possible to routinely measure the aberrations of the human eye, but there is as yet no established metric that relates aberrations to visual acuity. A number of metrics have been proposed and evaluated, and some perform well on particular sets of evaluation data.
Andrew B, Watson, Albert J, Ahumada
openaire +2 more sources
Photodiagnosis and Photodynamic TherapyBackground: To compare the effect of two daily disposable soft contact lenses on ocular wavefront aberrations. Methods: This study included 34 eyes from 17 patients aged 18 to 40 years (mean age: 27.12±8.3 years) with identical myopic refractive errors ...
Konuralp Yakar
doaj +1 more source