Download or read book Analysis of a Long Baseline Stellar Interferometer System written by Paul Logan Kebabian and published by . This book was released on 1968 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Papers on Long Baseline Stellar Interferometry written by Peter R. Lawson and published by SPIE-International Society for Optical Engineering. This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Topics in this volume include: visibility of interference-fringes in the focus of a telescope; interferometer methods in astronomy; and interference fringes obtained on Vega with two optical telescopes.
Download or read book Very Long Baseline Interferometry written by Marcello Felli and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: The quest for high resolution has preoccupied radio astronomers ever since radio waves were first detected from space fifty years ago. This venture was par ticularly stimulated by the discovery of quasars, and led to the development of interferometer techniques using baselines of transglobal dimensions. These meth ods have become known as Very Long Baseline Interferometry (VLBI). Arrays of radio telescopes situated all over the Earth (or even in space) are regularly used for researches in radio astronomy, reaching resolutions as small as a fraction of a milli arcsecond. The technique also allows the measurement of the positions of the radio telescopes to a few millimeters and so VLBI has become a major tool in geodesy and the study of the rotation of the Earth. VLBI has now passed the pioneer stage and is becoming a standard facility available to astronomers and geodesists, requiring the coordination of the operations of indpendently owned radio telescopes around the world. In Europe observatories from England, Federal Republic of Germany, France, Italy, Poland, Sweden and The Netherlands are coordinated in their VLBI activity by the European VLBI Network Consortium (EVN). The Programme Committee of the EVN allocates time to scientific projects on a routine basis three times a year. The Unites States has a similar arrangement of a network of independent radio observatories, and joint experiments using 'Global Network' are often made.
Download or read book Very Long Baseline Interferometer written by Fujinobu Takahashi and published by IOS Press. This book was released on 2000 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: VLBI is an acronym for Very Long Baseline Inferometry, and can be roughly divided into two areas of application. The first area is in geodesy, which is covered in considerable detail in this book. The second area is in astrometry, or radio astronomy, which is only briefly treated in the book.
Download or read book Principles of Long Baseline Stellar Interferometry written by Peter R. Lawson and published by . This book was released on 2000 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interferometry and Synthesis in Radio Astronomy written by A. Richard Thompson and published by John Wiley & Sons. This book was released on 2008-11-20 with total page 715 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive, authoritative coverage of interferometric techniques for radio astronomy In this Second Edition of Interferometry and Synthesis in Radio Astronomy, three leading figures in the development of large imaging arrays, including very-long-baseline interferometry (VLBI), describe and explain the technology that provides images of the universe with an angular resolution as fine as 1/20,000 of an arcsecond. This comprehensive volume begins with a historical review followed by detailed coverage of the theory of interferometry and synthesis imaging, analysis of interferometer response, geometrical relationships, polarimetry, antennas, and arrays. Discussion of the receiving system continues with analysis of the response to signals and noise, analog design requirements, and digital signal processing. The authors detail special requirements of VLBI including atomic frequency standards, broadband recording systems, and antennas in orbit. Further major topics include: * Calibration of data and synthesis of images * Image enhancement using nonlinear algorithms * Techniques for astrometry and geodesy * Propagation in the neutral atmosphere and ionized media * Radio interference * Related techniques: intensity interferometry, moon occultations, antenna holography, and optical interferometry Interferometry and Synthesis in Radio Astronomy, Second Edition is comprehensive in that it provides an excellent overview of most radio astronomical instrumentation and techniques.
Download or read book Principles of Long baseline Stellar Interferometry written by Peter Lawson and published by Wiley-Interscience. This book was released on 2011-05-30 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: Principles of Long-Baseline Stellar Interferometry provides a comprehensive graduate-level introduction to the rapidly expanding field of long-baseline stellar interferometry. Author Peter Lawson describes the fundamental principles of astronomical interferometry, emphasizing the physics and engineering aspects of stellar interferometers. Based on a substantial revision of Principles of Long Baseline Stellar Interferometry, which was published by the Jet Propulsion Laboratory in 2000, the revised text includes contributions from numerous experts in the field, updated material, new chapters, and a standardized use of variables.
Download or read book Interferometry and Synthesis in Radio Astronomy written by A. Richard Thompson and published by Springer. This book was released on 2017-02-22 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is open access under a CC BY-NC 4.0 license. The third edition of this indispensable book in radio interferometry provides extensive updates to the second edition, including results and technical advances from the past decade; discussion of arrays that now span the full range of the radio part of the electromagnetic spectrum observable from the ground, 10 MHz to 1 THz; an analysis of factors that affect array speed; and an expanded discussion of digital signal-processing techniques and of scintillation phenomena and the effects of atmospheric water vapor on image distortion, among many other topics. With its comprehensiveness and detailed exposition of all aspects of the theory and practice of radio interferometry and synthesis imaging, this book has established itself as a standard reference in the field. It begins with an overview of the basic principles of radio astronomy, a short history of the development of radio interferometry, and an elementary discussion of the operation of an interferometer. From this foundation, it delves into the underlying relationships of interferometry, sets forth the coordinate systems and parameters to describe synthesis imaging, and examines configurations of antennas for multielement synthesis arrays. Various aspects of the design and response of receiving systems are discussed, as well as the special requirements of very-long-baseline interferometry (VLBI), image reconstruction, and recent developments in image enhancement techniques and astrometric observations. Also discussed are propagation effects in the media between the source and the observer, and radio interference, factors that limit performance. Related techniques are introduced, including intensity interferometry, optical interferometry, lunar occultations, tracking of satellites in Earth orbit, interferometry for remote Earth sensing, and holographic measurements of antenna surfaces. This book will benefit anyone who is interested in radio interferometry techniques for astronomy, astrometry, geodesy, or electrical engineering.
Download or read book High Precision Infra Red Stellar Interferometry written by Benjamin F. Lane and published by Universal-Publishers. This book was released on 2003 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation describes work performed at the Palomar Testbed Interferometer (PTI) during 1998-2002. Using PTI, we developed a method to measure stellar angular diameters in the 1-3 milli-arcsecond range with a precision of better than 5%. Such diameter measurements were used to measure the mass-radius relations of several lower main sequence stars and hence verify model predictions for these stars. In addition, by measuring the changes in Cepheid angular diameters during the pulsational cycle and applying a Baade-Wesselink analysis we are able to derive the distances to two galactic Cepheids (h Aql & z Gem) with a precision of 10%; such distance determinations provide an independent calibration of the Cepheid period-luminosity relations that underpin current estimates of cosmic distance scales. Second, we used PTI and the adaptive optics facility at the Keck Telescope on Mauna Kea to resolve the low mass binary systems BY Dra and GJ 569B, resulting in dynamical mass determinations for these systems. GJ 569B most likely contains at least one sub-stellar component, and as such represents the first dynamical mass determination of a brown dwarf. Finally, a new observing technique, dual star phase referencing, was developed and demonstrated at PTI. Phase referencing allows interferometric observations of stars previously too faint to observe, and is a prerequisite for large-scale interferometric astrometry programs such as the one planned for the Keck Interferometer; interferometric astrometry is a promising technique for the study of extra-solar planetary systems, particularly ones with long-period planets.
Download or read book Principles of Stellar Interferometry written by Andreas Glindemann and published by Springer Science & Business Media. This book was released on 2011-01-04 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt: The imaging process in stellar interferometers is explained starting from first principles on wave propagation and diffraction. Wave propagation through turbulence is described in detail using Kolmogorov statistics. The impact of turbulence on the imaging process is discussed both for single telescopes and for interferometers. Correction methods (adaptive optics and fringe tracking) are presented including wavefront sensing/fringe sensing methods and closed loop operation. Instrumental techniques like beam combination and visibility measurements (modulus and phase) as well as Nulling and heterodyne interferometry are described. The book closes with examples of observing programmes linking the theory with individual astrophysical programmes.
Download or read book Optical Long Baseline Interferometry written by Peter A. Schuller and published by VDM Publishing. This book was released on 2008 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the quest to look ever closer at astronomical objects, optical long-baseline interferometry has become a standard tool for astronomers. It can achieve spatial resolutions exceeding that of even the largest telescope. Offered at major observatories where interferometric instruments provide high spatial resolution often combined with spectral information, optical long-baseline interferometry allows for the detailed study of astronomical objects and processes in their environment. The author Peter A. Schuller introduces the basic concepts of optical long-baseline interferometry and uses the example of a particular instrument to illustrate various aspects in the development and the operation of an astronomical interferometer. Focus is put on the calibration of the instrument both in the laboratory and during observations. The potential of astronomical interferometry is highlighted by a study in which interferometric data is used to constrain computer models of astronomical objects. This book is aimed at readers with some background in science and engineering seeking a brief introduction to optical long-baseline interferometry in concept, implementation and application.
Download or read book Very Long Baseline Interferometry Applied to Polar Motion Relativity and Geodesy written by Chopo Ma and published by . This book was released on 1978 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Very Long Baseline Interferometry and the VLBA written by J. Anton Zensus and published by . This book was released on 1995 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Principles of Long Baseline Stellar Interferometry written by Peter A. Lawson and published by . This book was released on 2000 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Very Long Baseline Radio Interferometry Using a Geostationary Satellite written by and published by . This book was released on 1978 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthetic aperture Optics written by National Research Council (U.S.). Advisory Committee to the Air Force Systems Command and published by . This book was released on 1968 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Open Skies written by Kenneth I. Kellermann and published by Springer Nature. This book was released on 2020-01-01 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book on the history of the National Radio Astronomy Observatory covers the scientific discoveries and technical innovations of late 20th century radio astronomy with particular attention to the people and institutions involved. The authors have made extensive use of the NRAO Archives, which contain an unparalleled collection of documents pertaining to the history of radio astronomy, including the institutional records of NRAO as well as the personal papers of many of the pioneers of U.S. radio astronomy. Technical details and extensive citations to original sources are given in notes for the more technical readers, but are not required for an understanding of the body of the book. This book is intended for an audience ranging from interested lay readers to professional researchers studying the scientific, technical, political, and cultural development of a new science, and how it changed the course of 20th century astronomy.
