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Digital holographic interferometry of convective heat transport
Applied Optics, 1981Real-time holographic interferometry has been used to study the convective heat transport in a flat plate solar collector. The analysis and interpretation of the interferograms using digital techniques are discussed. This study aims to develop an automated digital process for interference pattern analysis, and thus special attention is given to those ...
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Picosecond three-color holographic digital interferometry
Optics and Spectroscopy, 2009The possibilities of multicolor digital holographic interferometry are experimentally studied upon measuring displacements of a surface in radiation of a picosecond Nd:YAG laser with the radiation frequency conversion into harmonics (λ1 = 1.06 µm, λ2 = 0.53 µm, and λ3 = 0.35 µm).
V. S. Gurevich +4 more
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Digital holographic interferometry: Optomechanical properties of fibers
Polymer Engineering & Science, 2011AbstractStudying polymer fiber's mechanical properties leads to an increased understanding of the behavior of polymeric structures. This will support the design of new synthetic fibers with improved properties. Thus, there is great interest in the exact knowledge of these properties.
K.M. Yassien +2 more
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Applications of time-averaged digital holographic interferometry
2006This work reports on recent results in the area of the time-averaged digital holographic interferometry. Two techniques are described, one that re-moves the zero-order reconstruction term thus allowing recording of large objects, and the other by which the hidden stationary deformations can be detected.
Marc Torzynski +3 more
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Quasi-real-time digital holographic interferometry
SPIE Proceedings, 2002In the paper a new approach to quasi real-time phase reconstruction of digitally recorded holograms is presented. A new, low cost and fast measurement system based on digital holographic interferometry is described. Examples of experimental results representing deformations of an object under thermal load are shown.
Malgorzata Kujawinska +2 more
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Digital Holographic Interferometry and Phase-Shifting Digital Holography
2015If the holograms of the object are digitally recorded using a CCD camera and they are compared by computing the phase difference of the digitally reconstructed images, then the process is called digital holographic interferometry (DHI). In current technology, commercial CCD cameras have pixel sizes around 5 mm, which can sometimes limit the spatial ...
Rola Aylo +2 more
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Digital holographic metrology based on multi-angle interferometry
Optics Letters, 2016We propose a multi-angle interferometry method for digital holographic metrology. In an application of three-dimensional (3D) reconstruction, the hologram corresponding to a different illumination angle is recorded as the illumination angle with a single wavelength tilted at regular intervals by an electronically controlled rotating stage.
Chao Jiang, Jun Dong, Shuhai Jia
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Characterization of optical fibers by digital holographic interferometry
SPIE Proceedings, 2009The refractive index distribution over a cross-section of an optical fiber can differ between core and cladding, can vary over the core in graded index fibers, or may even have a more complicated form in polarization preserving fibers. Besides this intended variations the refractive index may vary due to a loading of the fiber like pressure or ...
H.H. Wahba, Thomas Kreis
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Digital Holographic Interferometry for Radiation Dosimetry
2015A novel optical calorimetry approach is proposed for the dosimetry of therapeutic radiation, based on the optical technique of Digital Holographic Interferometry (DHI). This detector determines the radiation absorbed dose to water by measurement of the refractive index variations arising from radiation induced temperature increases. The output consists
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Digital heterodyne holographic interferometry of flow fields
AIP Conference Proceedings, 1980Flow medium inhomogeneities associated with the gain region of large scale laser systems can result in significant degradation of the outcoupled laser beam quality. To achieve beam quality goals, relative density fluctuations will have to be below 10−5.
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