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Page 1
Adaptive Optics.
Mohankumar A, Tripathy K. Mohankumar A, et al. 2023 Aug 25. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2024 Jan–. 2023 Aug 25. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2024 Jan–. PMID: 36944008 Free Books & Documents.
Light traveling through any media other than vacuum undergoes aberrations due to changes in the refractive index and interface of the medium. Similarly, rays exiting the eye also have wavefront aberrations contributed by the differences in the refractive index of …
Light traveling through any media other than vacuum undergoes aberrations due to changes in the refractive index and interface of the …
Bringing the visible universe into focus with Robo-AO.
Baranec C, Riddle R, Law NM, Ramaprakash AN, Tendulkar SP, Bui K, Burse MP, Chordia P, Das HK, Davis JT, Dekany RG, Kasliwal MM, Kulkarni SR, Morton TD, Ofek EO, Punnadi S. Baranec C, et al. J Vis Exp. 2013 Feb 12;(72):50021. doi: 10.3791/50021. J Vis Exp. 2013. PMID: 23426078 Free PMC article.
For example, the Hubble Space Telescope (HST), with a 2.4-m primary mirror, has an angular resolution at visible wavelengths of ~0.04 arc seconds. The atmosphere is composed of air at slightly different temperatures, and therefore different indices of refraction, co …
For example, the Hubble Space Telescope (HST), with a 2.4-m primary mirror, has an angular resolution at visible wavelengths of ~0.04 arc se …
Assessment of ZTD Derived from COSMIC Occultation Data with ECWMF, Radiosondes, and GNSS.
Fu N, Jiang M, Li F, Guo P, Hou C, Wu M, Wu J, Wang Z, Kan L. Fu N, et al. Sensors (Basel). 2022 Jul 12;22(14):5209. doi: 10.3390/s22145209. Sensors (Basel). 2022. PMID: 35890887 Free PMC article.
Global Navigation Satellite System (GNSS) signals generate slant tropospheric delays when they pass through the atmosphere, which is recognized as the main source of error in many spatial geodetic applications. The zenith tropospheric delay (ZTD) derived from radio occulta …
Global Navigation Satellite System (GNSS) signals generate slant tropospheric delays when they pass through the atmosphere, which is …
Random sub-Nyquist polarimetric modulator.
Asensio Ramos A. Asensio Ramos A. Appl Opt. 2016 Feb 20;55(6):1324-32. doi: 10.1364/AO.55.001324. Appl Opt. 2016. PMID: 26906585
The retarders are modulated at 500 Hz, a frequency comparable to that of the variations of the refraction index in the earth's atmosphere, which is usually termed as seeing in astronomical observations. ...
The retarders are modulated at 500 Hz, a frequency comparable to that of the variations of the refraction index in the earth's atm …
Measuring the turbulence profile in the lower atmospheric boundary layer.
van Iersel M, Paulson DA, Wu C, Ferlic NA, Rzasa JR, Davis CC, Walker M, Bowden M, Spychalsky J, Titus F. van Iersel M, et al. Appl Opt. 2019 Sep 1;58(25):6934-6941. doi: 10.1364/AO.58.006934. Appl Opt. 2019. PMID: 31503665
In these cases, the refractive index structure function parameter cannot be assumed constant, since it varies with height. ...Turbulence height profiles have been measured since the 1970s, mainly for astronomical observations. These profiles are usually measured for …
In these cases, the refractive index structure function parameter cannot be assumed constant, since it varies with height. ...Turbule …
The Sun/Moon Illusion in a Medieval Irish Astronomical Tract.
Ross HE. Ross HE. Vision (Basel). 2019 Aug 7;3(3):39. doi: 10.3390/vision3030039. Vision (Basel). 2019. PMID: 31735840 Free PMC article.
The Irish Astronomical Tract is a 14th-15th century Gaelic document, based mainly on a Latin translation of the eighth-century Jewish astronomer Messahala. ...He seems to have been unaware of alternative perceptual explanations. The refraction explanation per …
The Irish Astronomical Tract is a 14th-15th century Gaelic document, based mainly on a Latin translation of the eighth-century Jewish …
Some theorems on "arctic mirages": hillingar effect and superior mirages.
Dettwiller L. Dettwiller L. J Opt Soc Am A Opt Image Sci Vis. 2019 Dec 1;36(12):1997-2004. doi: 10.1364/JOSAA.36.001997. J Opt Soc Am A Opt Image Sci Vis. 2019. PMID: 31873371
In a stratified or a spherically symmetric atmosphere, we consider some cases where a curved light ray connects two points, $A$A and $S$S, on the sea or the ground, at the same height as in some cases of superior mirages or "arctic mirages." ...We show that a change of var …
In a stratified or a spherically symmetric atmosphere, we consider some cases where a curved light ray connects two points, $A$A and …
Season of birth, natural light, and myopia.
Mandel Y, Grotto I, El-Yaniv R, Belkin M, Israeli E, Polat U, Bartov E. Mandel Y, et al. Ophthalmology. 2008 Apr;115(4):686-92. doi: 10.1016/j.ophtha.2007.05.040. Epub 2007 Aug 15. Ophthalmology. 2008. PMID: 17698195
All were Israeli-born conscripts to the Israeli Defense Forces who were examined during the 5-year period 2000 through 2004. METHODS: Noncycloplegic refraction was determined by autorefractometer and validated by qualified optometrists. Myopia, defined on the basis of righ …
All were Israeli-born conscripts to the Israeli Defense Forces who were examined during the 5-year period 2000 through 2004. METHODS: Noncyc …
Ground-based satellite-type images of the upper-atmosphere emissive layer.
Pautet D, Moreels G. Pautet D, et al. Appl Opt. 2002 Feb 10;41(5):823-31. doi: 10.1364/ao.41.000823. Appl Opt. 2002. PMID: 11908210
In this region the upper atmosphere introduces in the 0.7-3 microns range an additional component due to the OH vibrational band emission that should be subtracted from the astronomical data. Observations of this upper-atmosphere emission performed at the Pic …
In this region the upper atmosphere introduces in the 0.7-3 microns range an additional component due to the OH vibrational band emis …
Pupil inversion Mach-Zehnder interferometry for diffraction-limited optical astronomical imaging.
Prieto-Blanco X, Liñares J, Montero-Orille C, Moreno V, Mouriz D, Nistal MC. Prieto-Blanco X, et al. Opt Express. 2020 Sep 14;28(19):27823-27838. doi: 10.1364/OE.396338. Opt Express. 2020. PMID: 32988067 Free article.
We present theoretical and laboratory experimental results on a robust interferometric device based on pupil inversion, or 180() rotational shearing interferometry. The image of an astronomical object degraded by the atmosphere turbulence can be restored (ideally up …
We present theoretical and laboratory experimental results on a robust interferometric device based on pupil inversion, or 180() rotational …
24 results