Results 281 to 290 of about 51,201 (322)
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FIBER OPTICS IN ASTRONOMICAL INSTRUMENTS
Optics and Photonics News, 1996The author describes the application of fiber optics in astronomical spectrographs and interferometers. Important properties of fiber optics that impact spectroscopic applications are also discussed.
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Collimators for X-ray Astronomical Optics
2022An X-ray collimator, or baffle, can be installed in the X-ray optics of an X-ray telescope. This component is placed in front of an X-ray mirror to protect the mirror from severe in-orbit thermal environment or to limit the mirror’s field of view. Although the latter may be a disadvantage in the viewpoint of observational performance, the collimation ...
Mori, H., Friedrich, P.
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Optical astronomical angular resolution
Journal of Optics, 1990The authors study the characteristic parameters of the optical resolution in optical astronomy. Relations are established between the parameters of the atmospheric transfer function and those which are measured on a star profile. Then, they compute a statistical series of images with a log-normal distribution function, the deviation of each image from ...
G Coupinot, J Hecquet, R Futaully
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Astronomical adaptive optics in parameter space
Optics Letters, 2000We present a general, undiscretized formulation of astronomical adaptive optics that encompasses arbitrary guide star sources and deformable mirror configurations. It is shown that wave-front measurements can be represented as samples of an integral transform of the turbulence perturbation and also that the desired information for adaptive correction ...
J C, Quartel, J B, Clifford, J C, Dainty
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Optical Astronomical Spectroscopy
1995Preface Atomic Processes INTRODUCTION TO SPECTROSCOPY Historical background Types of spectroscopy THE PHYSICS OF ATOMS AND MOLECULES Sommerfeld's refinements Space quantization Atomic structure Other viewpoints Quantum/wave mechanics ATOMIC ENERGY LEVELS Multiple electron atoms ^IL-S coupling Space quantization Term formation Closed shells and ...
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Optical properties of astronomical silicates
SPIE Proceedings, 2008Correct interpretation of a vast array of astronomical data relies heavily on understanding the properties of silicate dust as a function of wavelength, temperature, and crystallinity. We introduce the OPASI-T (Optical Properties of Astronomical Silicates with Infrared Techniques) project to address the need for high fidelity optical characterization
S. Rinehart +6 more
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Optical fibers in astronomical instruments
The Astronomy and Astrophysics Review, 1992This review is of current and projected applications of optical fibers to observational astronomy. The intent is to provide astronomers with a broad perspective on the subject, with the hope of encouraging productive use of optical fibers in the design of new instrumentation. The unique characteristics of fibers have been (or soon will be) exploited to
William D. Heacox, Pierre Connes
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Astronomical Adaptive Optics Programs
1998Abstract This chapter contains a capsule summary of the organization, goals, and achievements of the major research programs in astronomical adaptive optics around the world, as they existed at the end of 1997. Most of these efforts are associated with specific telescopes.
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Differential adaptive optics for astronomical interferometry
Applied Optics, 1991Sometimes it suffices to make the wave-front distortions across individual telescopes equal rather than zero. This leads to the concept of differential adaptive optics.
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