By Thomas G. Brown, Katherine Creath, Herwig Kogelnik, Michael Kriss, Joanna Schmit, Marvin J. Weber
Written via across the world well-known specialists, the prime quality of the articles presents liable details on subject matters of present curiosity in commercial and educational examine in addition to historical past wisdom. protecting either theoretical and utilized optics, each one article has not just an inventory of references brought up within the textual content but additionally a consultant to extra examining. every one article additionally concludes with a thesaurus containing the technical phrases valuable for the subject into consideration. all through, the subject material is handled in an educational, straight forward method instead of as a natural reference and is supplemented by means of references mentioned within the textual content and a list of significant experiences and books.
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Extra info for The Optics Encyclopedia: Basic Foundations and Practical Applications (5 vols, Wiley 2004)
Example text
Furthermore, these corrections have to be made faster than changes in the turbulent atmosphere occur, which in practice means that corrections have to be made at temporal frequencies of about 100 Hz. The degraded wavefront is measured by analyzing the light from a bright guide star, which serves as a reference point source. Two methods are commonly used for this analysis, either a Shack–Hartmann device, which divides the pupil of the telescope into subapertures and measures distortions in the slope of the wavefront from dislocations in the positions of the images of the guide star in the subpupils, or by curvature sensing, where the intensities measured in strongly defocused images directly give the local curvature of the wavefront.
Bellingham, WA: SPIE. Kitchin, C. R. (2002), Optical Astronomical Spectroscopy. Bristol and Philadelphia: Institute of Physics Publishing. Manly, P. L. (1991), Unusual Telescopes. Cambridge: Cambridge University Press. Roddier, F. (1999), Adaptive Optics in Astronomy. Cambridge: Cambridge University Press. Tyson, R. K. (1998), Principles of Adaptive Optics. Boston: Academic Press. Wilson, R. N. (1996), Reflecting Telescope Optics I. Berlin: Springer. Wilson, R. N. (1999), Reflecting Telescope Optics II.
A. A. "4 (2000) 10 5 Fig. 4-m telescope and adaptive optics. (Courtesy M. Feldt, MPIA) 43 44 Astronomical Telescopes and Instrumentation inflexibility in changing instruments. Therefore, it is desirable to have ground-based large telescopes which give diffraction-limited images. One technique that has been developed to obtain diffraction-limited images is Speckle Interferometry. Hundreds of exposures with exposure times shorter than the timescale of variations in the seeing (snapshots) are taken during the observations and later used to reconstruct the undegraded image.
