Results 291 to 300 of about 5,111 (331)
Some of the next articles are maybe not open access.
Recent advances in astronomical adaptive optics
Applied Optics, 2010The imaging performance of large ground-based astronomical telescopes is compromised by dynamic wavefront aberration caused by atmospheric turbulence. Techniques to measure and correct the aberration in real time, collectively called adaptive optics (AO), have been developed over the past half century, but it is only within the past decade that the ...
exaly +3 more sources
Optics in the Orbiting Astronomical Observatory
Applied Optics, 1962The NASA Orbiting Astronomical Observatory (OAO) is a precisely stabilized spacecraft designed to carry large photoelectric astronomical telescopes. General background-information is presented, and the specific optical systems planned currently for the Observatory are described.
exaly +2 more sources
Aerospace and astronomical optics
Journal of Optical Technology (A Translation of Opticheskii Zhurnal), 2001Yu. A. Gogolev, Yu. N. Kondratev
exaly +2 more sources
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.
openaire +2 more sources
The application of interferometry to optical astronomical imaging
Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 2002In the first part of this review we survey the role optical/infrared interferometry now plays in ground-based astronomy. We discuss in turn the origins of astronomical interferometry, the motivation for its development, the techniques of its implementation, examples of its astronomical significance, and the limitations of the current generation of ...
John E, Baldwin, Christopher A, Haniff
openaire +2 more sources
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
openaire +1 more source
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 ...
openaire +1 more source
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
openaire +1 more source