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About 10,000 papers for “Interferometry”

Polarimetric Interferometry and Differential Interferometry

Martin Hellmann, S.R. Cloude · Defense Technical Information Center (DTIC) · 2005

This Lecture mainly based on [1, 2] presents the role of Polarimetry in SAR Interferometry. A general formulation for vector wave interferometry is presented that includes conventional scalar interferometry presented in the respective former lecture as a special case. Based on this formulation, the coherence optimization problem can be solved to obtain the optimum scattering mechanisms that lead to the best phase estimates. Comparison with conventional single-polarization estimates illustrates the significant processing gains that are possible if there is access to full polarimetric interferometric data. A comparison with conventional single-polarization presented in former lectures illustrates the significant processing gains that are possible if access to full polarimetric interferometric data is possible. The strong polarization depends of the coherence will be addressed and the analytical solution for optimum polarization states that maximize the interferometric coherence will be derived and applied to experimental data. These improved interferogrammes allow an improvement of the accuracy of derived DEM products. The introduction of a new coherent decomposition theorem for interferometric applications based on the Singular value spectrum of a 3 x 3 complex matrix allows the decomposition of polarimetric interferometric problems into a set of coherent scattering mechanism. As a consequence it is possible to generate interferograms related to certain independent scattering mechanisms and extract the height differences between them. The limitation of this technique is the existence of independent scattering mechanisms located at different height positions. To explain the physical origin of these mechanisms a coherent electromagnetic scattering model will be established which. additionally, can be used to establish the suitability of the decomposition algorithm for solving the problem of estimating the location of the effective scattering center.

Cited by 3

Interferometry

Herbert Groß, Bernd Dörband, Henriette Müller · 2012

Cited by 0

Interferometry

Jorrín Merino, Lucía · UCrea (University of Cantabria)

By using two different variants of interferometers, the Michelson and the Twyman-Green interferometer, various characteristics were studied. By using the Michelson interferometer the wavelength of a laser was studied, obtaining a result of λ = (620.92 ± 37.92) nm. Using the Twyman-Green interferometer different surfaces were analysed. In the first part, different types of plastics were examined, such as flat or curved sheets of plastics, plastics with holes, scratches or folds. Using the same setup, the interference pattern of samples holders with different thicknesses and the plastic lenses of a no magnification glasses were also studied. Changing some parts of the setup, the fringes produced by different faces of a prism and by a plano-convex lens were also examined. Finally a two-lens system was studied with a convex mirror and the plano-convex lens used before.

Cited by 0

Interferometry

Parameswaran Hariharan, Katherine Creath · digital Encyclopedia of Applied Physics · 2005

Abstract This article reviews the field of interferometry. It begins by outlining the fundamentals of two‐beam and multiple‐beam interference. The rest of the article discusses the applications of interferometry for measurement of length, optical testing, fringe analysis, interference microscopy, interferometric sensors, interference spectroscopy, nonlinear interferometers, interferometric imaging, space‐time and gravitation, holographic interferometry, Moiré techniques, and speckle interferometry. Each section provides a referenced (and cross‐referenced) overview of the application area.

Cited by 0

Interferometry

David M. Feldbaum · Synthesis lectures on wave phenomena in the physical sciences · 2020

Cited by 0

Interferometry

A.C. Marchant · Optics & Laser Technology · 1984

Cited by 1

Interferometry

Stephen G. Lipson, Henry Lipson, David Stefan Tannhauser · Cambridge University Press eBooks · 1995

In Chapter 8 we discussed the theory of Fraunhofer diffraction and interference emphasizing in particular the relevance of Fourier transforms. In this chapter we shall describe the applications of interference to measurement; this is called interferometry. Some of the most accurate dimensional measurements are made by interferometric means, particularly using waves of different types – electromagnetic, matter, acoustic etc. The variety of techniques is enormous, and we shall limit ourselves in this chapter to a discussion of several distinctly different interferometric principles, without any intention of describing the variety of instruments or methods within the classes. There are several monographs on interferometry which discuss practical aspects in greater detail, for example Tolansky (1973), Steel (1983) and Hariharan (1985).

Cited by 1

Interferometry

Evert Slob, Deyan Draganov, Kees Wapenaar · 2016

Cited by 0

Interferometry

Lucía Jorrín Merino · UCrea (University of Cantabria) · 2024

By using two different variants of interferometers, the Michelson and the Twyman-Green interferometer, various characteristics were studied. By using the Michelson interferometer the wavelength of a laser was studied, obtaining a result of λ = (620.92 ± 37.92) nm. Using the Twyman-Green interferometer different surfaces were analysed. In the first part, different types of plastics were examined, such as flat or curved sheets of plastics, plastics with holes, scratches or folds. Using the same setup, the interference pattern of samples holders with different thicknesses and the plastic lenses of a no magnification glasses were also studied. Changing some parts of the setup, the fringes produced by different faces of a prism and by a plano-convex lens were also examined. Finally a two-lens system was studied with a convex mirror and the plano-convex lens used before.

Cited by 0

INTERFEROMETRY

R. Fehle, F. Mayinger · A-to-Z Guide to Thermodynamics Heat and Mass Transfer and Fluids Engineering · 2008

Cited by 1

Interferometry

David P. Towers, Catherine E. Towers · Series in optics and optoelectronics · 2013

Shape reconstruction using coded structured light is considered one of the most reliable techniques to recover object surfaces. With a calibrated projector-camera pair, a light pattern is projected onto the scene and imaged by the camera. Correspondences between projected and recovered patterns are found and used to extract three-dimensional (3D) surface information. Among structured light (SL) techniques, the combination of dense acquisition and real time constitutes an active field of research. To achieve density and real time, most of the work present in the literature is based on the projection of a single one-shot fringe pattern, where depth is extracted analyzing phase deviation of the imaged pattern. However, the algorithms employed to unwrap the phase are computationally slow and can fail in the presence of depth discontinuities and occlusions. This chapter presents an up-to-date review and a new classification of the existing techniques. Moreover, a proposal for a new one-shot dense pattern that combines De Bruijn and fringe pattern projection to obtain an absolute, accurate, and computationally fast 3D reconstruction is presented. Finally, the proposed technique is compared to some of the already existing methods, obtaining both qualitative and quantitative results. The advantages and drawbacks of the proposed technique are discussed.

Cited by 0