Results 151 to 160 of about 25,876 (202)
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Phase-shifting digital holography
Optics Letters, 1997A new method for three-dimensional image formation is proposed in which the distribution of complex amplitude at a plane is measured by phase-shifting interferometry and then Fresnel transformed by a digital computer. The method can reconstruct an arbitrary cross section of a three-dimensional object with higher image quality and a wider viewing angle ...
I, Yamaguchi, T, Zhang
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Subtraction digital holography
Applied Optics, 2003Overlapping of the desired (first-order) and undesired (zero-order) terms originating from the recorded primary-fringe patterns in digital holography is a problem without a real-time solution. We propose a procedure for suppressing the zero-order disturbance that is realizable in real time.
Demoli, Nazif +2 more
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Comparative digital holography
Optics Letters, 2002We described a method for direct holographic comparison of the shape or the deformation of two objects when it is not necessary that both samples be located at the same place. In contrast to the well-known incoherent techniques based on inverse fringe projection, this new approach uses a coherent mask that is imaged onto a sample object that has a ...
Wolfgang, Osten +2 more
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DIGITAL HYPERSPECTRAL HOLOGRAPHY
Автометрия, 2020A method and an optical scheme for recording digital hyperspectral holograms in the light of an incoherent source are considered. The optical scheme includes an interferometer with a scanning mirror for generating reference waves. The set of complex amplitudes of the object field is calculated by Fourier transform of the interferograms in each pixel of
S. G. Kalenkov, G. S. Kalenkov
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Time-averaged digital holography
Optics Letters, 2003We demonstrate that it is possible to study the modal structures of a vibrating object with digitally recorded holograms by use of the time-averaging principle. We investigate the numerical reconstruction from a theoretical point of view, and we show that the numerically reconstructed object from a digital hologram is modulated by the zeroth-order ...
Pascal, Picart +3 more
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SPIE Proceedings, 2012
Terahertz wave (THz, also name T-Ray) belongs to far-infrared electromagnetic radiation. Since its unique properties, THz techniques have been paid more and more attentions during the past decades. In this field, THz digital holography is an important research branch, which can accurately extract three-dimensional optical information of objects ...
Xinke Wang +3 more
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Terahertz wave (THz, also name T-Ray) belongs to far-infrared electromagnetic radiation. Since its unique properties, THz techniques have been paid more and more attentions during the past decades. In this field, THz digital holography is an important research branch, which can accurately extract three-dimensional optical information of objects ...
Xinke Wang +3 more
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Stereoscopic Digital Holography
IEEE Transactions on Plasma Science, 2010The ability to follow the motion of individual particles in a dusty plasma is essential for most experiments on complex plasmas. However, for 3-D particle clouds, the precise determination of all particle coordinates at once is a sophisticated task.
Mattias Kroll +2 more
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Unconventional digital holography
Digital Holography and Three-Dimensional Imaging, 2013Traditionally, holography requires coherent-light for object illumination and a reference beam for recording its 3-D information as a hologram. We explore the unconventional techniques for digital holography that avoid coherent-light and reference.
Dinesh N. Naik +2 more
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Annual Meeting Optical Society of America, 1988
Ordinary holograms are made by interference experiments, digital holograms by computer and plotter. The object does not have to exist physically. Most advantages of digital holograms derive from that fact. Fundamentals and some applications are reviewed: AO display; image processing; and testing.
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Ordinary holograms are made by interference experiments, digital holograms by computer and plotter. The object does not have to exist physically. Most advantages of digital holograms derive from that fact. Fundamentals and some applications are reviewed: AO display; image processing; and testing.
openaire +1 more source
SPIE Proceedings, 2003
Digitally recorded holograms in the infrared region(10.6 Micron) are numerically reconstructed.
De Nicola S +5 more
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Digitally recorded holograms in the infrared region(10.6 Micron) are numerically reconstructed.
De Nicola S +5 more
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