Intensity Interferometry in the Spatial Domain
Author | : Paul Hamilton Deitz |
Publisher | : |
Total Pages | : 0 |
Release | : 1973 |
Genre | : Interferometers |
ISBN | : |
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Author | : Paul Hamilton Deitz |
Publisher | : |
Total Pages | : 0 |
Release | : 1973 |
Genre | : Interferometers |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 68 |
Release | : 1973 |
Genre | : |
ISBN | : |
A modification of the Hanbury Brown-Twiss experiment is described whereby intensity correlation is performed using coherent light and the statistical averages are taken in the space domain. This result is used to reconstruct the irradiance distribution of a spatially rough source. The far- field intensity distribution is recorded spatially for one time-resolution unit of the detector. The resulting spatial signal is autocorrelated and related to the intensity distribution over the source. Thus, without averaging in the time domain, a spatial Fourier-transform relation is derived between the far-field intensity correlation and the source irradiance, similar to the results of Hanbury Brown and Twiss.
Author | : |
Publisher | : |
Total Pages | : 68 |
Release | : 1973 |
Genre | : |
ISBN | : |
A modification of the Hanbury Brown-Twiss experiment is described whereby intensity correlation is performed using coherent light and the statistical averages are taken in the space domain. This result is used to reconstruct the irradiance distribution of a spatially rough source. The far- field intensity distribution is recorded spatially for one time-resolution unit of the detector. The resulting spatial signal is autocorrelated and related to the intensity distribution over the source. Thus, without averaging in the time domain, a spatial Fourier-transform relation is derived between the far-field intensity correlation and the source irradiance, similar to the results of Hanbury Brown and Twiss.
Author | : |
Publisher | : |
Total Pages | : 16 |
Release | : 1973 |
Genre | : |
ISBN | : |
There are a number of special benefits from detecting images by the technique of intensity correlation. (1) The method is relatively insensitive to the effects of atmospheric scintillation. (2) Because the signal is detected in the spatial-transform domain, high-frequency detail about the scattering surface translates to large spatial lags in the far field. This result could be particularly important at frequencies where detector resolution is not well developed. (3) A special advantage to intensity interferometry in the spatial domain is the utilization of guassian statistics in the spatial (not temporal) sense. By this method, sources with non-gaussian time statistics (such as single-axial-mode lasers) can be utilized. (4) Still another advantage of spatial detection is that images of moving surfaces can be formed using brief exposures.
Author | : Jim Bernard Breckinridge |
Publisher | : SPIE-International Society for Optical Engineering |
Total Pages | : 714 |
Release | : 1990 |
Genre | : Mathematics |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 616 |
Release | : 1994 |
Genre | : Science |
ISBN | : |
Author | : Robert Hanbury Brown |
Publisher | : Taylor & Francis Group |
Total Pages | : 208 |
Release | : 1974 |
Genre | : Nature |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 490 |
Release | : 1990 |
Genre | : Astronautics |
ISBN | : |
Author | : A. Richard Thompson |
Publisher | : Springer |
Total Pages | : 910 |
Release | : 2017-02-22 |
Genre | : Science |
ISBN | : 331944431X |
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.
Author | : A. Richard Thompson |
Publisher | : John Wiley & Sons |
Total Pages | : 715 |
Release | : 2008-11-20 |
Genre | : Science |
ISBN | : 352761785X |
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.