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Interferogram reduction for radial-shear and local-reference-holographic interferograms
Applied Optics, 1986In local reference holographic interferometry and radial shear interferometry, a small portion of the test beam is magnified and used as the reference for the rest of the wave front. The reference portion may be off-center or contain aberrations that complicate measurement of the wave front.
D R, Kohler, V L, Gamiz
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Method for InSAR/INS navigation system based on interferogram matching
IET radar, sonar & navigation, 2018Current navigation systems have a number of drawbacks including no cross-line resolution in terrain-aided navigation; scene matching affected by seasonal changes; terrain-aided navigation and synthetic aperture radar (SAR)-aided navigation system cannot ...
Shuai Jiang +4 more
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Unwrapping circular interferograms
Applied Optics, 2000The Green's formulation for phase unwrapping is generalized to the case of circular phase-support regions. A phase-unwrapping method, believed to be new, is developed in which two forms of the Green's function are used, one in a closed form and the other in the form of a series of Helmholtz equation eigenfunctions to satisfy homogeneous Neumann ...
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Step Heights from Interferograms
Applied Optics, 1973For the precise determination of a step height, the surface contour in the vicinity of the step must be determined. Methods that have proven satisfactory even in the presence of aberrations caused by poor flatness of object or comparison mirrors, by auxiliary optics, or by subsequent processing are described.
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Computer aided evaluation of interferograms
Experiments in Fluids, 1993A semi-automatic technique is presented for obtaining the density field from interferograms provided by a Mach-Zehnder setup in infinite fringe width adjustment using short exposure times. The algorithm relies on extracting the fringe edges from the original image and then numbering the resulting polygons according to their order of interference using ...
Bartels-Lehnhoff, H.H. +3 more
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Digital evaluation of interferograms
Measurement, 2004Abstract For one and a half decade, software for interferometric fringe evaluation has been developed and used at Graz University of Technology. Within the framework of an awarded grant, these software packages on interferometric fringe evaluation were subsumed under Windows and Unix platforms and are accessibly under http://optics.tugraz.at .
M. Hipp +3 more
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IEEE Transactions on Geoscience and Remote Sensing, 2007
Synthetic aperture radar interferometry is limited by temporal and geometrical decorrelation. Permanent scatterers (PSs) are helpful to overcome these problems, but their density in agricultural and out-of-town areas is not always sufficient. The forthcoming availability of satellite platforms with thinner orbital tubes and shorter revisit times will ...
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Synthetic aperture radar interferometry is limited by temporal and geometrical decorrelation. Permanent scatterers (PSs) are helpful to overcome these problems, but their density in agricultural and out-of-town areas is not always sufficient. The forthcoming availability of satellite platforms with thinner orbital tubes and shorter revisit times will ...
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Virtual interferogram-generation algorithm for phase measurement using two interferograms
SPIE Proceedings, 2016Phase-shifting digital holography is a technique for phase measurement with high spatial resolution and applied to many fields. This technique typically requires four phase-shifted interferograms between a signal beam and a reference beam. We focused on the two-step phase shifting algorithm, which needs only two phase-shifted interferograms and an ...
Jin Nozawa +4 more
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An Automated Interferogram Analysis Technique
Applied Optics, 1968An automated technique has been developed for the analysis of various types of interferograms. The technique makes use of a high speed digitized microdensitometer to scan the interferograms and a high speed computer to perform the required computations.
R A, Jones, P L, Kadakia
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Multitemporal SAR interferograms simulator
2006 2nd International Conference on Information & Communication Technologies, 2006Many are the examples of SAR and differential SAR interferometry application as well for ground elevation measurements as for surface deformation monitoring. A large number of interferometric techniques use instead of a single interferogram a database of multitemporal interferograms covering the same region.
C. Ferdaous, T. Florence, M. Henri
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