Results 21 to 30 of about 170,397 (209)
Comparative analysis of three mode-selection methods for solid-state lasers [PDF]
E3S Web of Conferences, 2021 In the Nd3+:YAG pulsed Q-switched laser system, the selective output of several low order modes of TEM00, TEM01 and TEM11 is realized by adding a iris diaphragm, a telescope or a Gaussian mirror at an appropriate position in the resonator, and the three ...
Sun Yan
doaj +1 more source
Low Vision Aids: Visual Outcomes and Barriers in Children with Low Vision
Delhi Journal of Ophthalmology, 2019 Aims: To study the demographic profile, cause of low vision, visual outcome and the barriers in using low vision aids (LVA). Design: Prospective observational clinical study.
V. R. Venkataramanan +5 more
doaj +1 more source
Active optics: deformable mirrors with a minimum number of actuators [PDF]
Journal of the European Optical Society-Rapid Publications, 2012 We present two concepts of deformable mirror to compensate for first order optical aberrations. Deformation systems are designed using both elasticity theory and Finite Element Analysis in order to minimize the number of actuators.
Laslandes M., Hugot E., Ferrari M.
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
Remote Sensing, 2022 Telescopic observations of Mercury consistently report systematic variations of the normalized spectral slope of visible-to-near-infrared reflectance spectra.
Kay Wohlfarth, Christian Wöhler
doaj +1 more source
Frontiers in Artificial Intelligence, 2022 The rapid pace in which various Artificial Intelligence and Machine Learning tools are developed, both within the research community and outside of it, often discourages the involved researchers from taking time to consider potential consequences and applications of the technical advances, especially the unintended ones.
openaire +3 more sources
Discrete Time Dynamic Model for Telescope Auto-Guiding System [PDF]
Journal of Astronomy and Space Sciences, 2007 In the auto-guiding system for obtaining a long exposure astrophotography, CCD camera is usually used for measuring guide errors which are affected by optical dispersion and mechanical disturbances.
Joon Hwa Lee
doaj +1 more source
Freeform Wide Field-of-View Spaceborne Imaging Telescope: From Design to Demonstrator
Sensors, 2022 Wide field-of-view imaging optics offer a huge potential for space-based Earth observation enabling the capture of global data. Reflective imaging telescopes are often favored, as they do not show chromatic aberrations and are less susceptible to ...
Luca Schifano +7 more
doaj +1 more source
Remote Sensing, 2022 The paper presents the results of analysis of astroclimatic conditions in the Big Telescope Alt-azimuthal (BTA) region (40°N–50°N; 35°E–55°E). Using data from the European center for medium-range weather forecast ReAnalysis (ERA-5), we estimated the ...
Artem Yu. Shikhovtsev +8 more
doaj +1 more source