Results 231 to 240 of about 28,756 (270)
Some of the next articles are maybe not open access.
Digital Holographic Interferometry and Speckle Correlation
AIP Conference Proceedings, 2010Relations and combinations between holographic interferometry and speckle correlation in contouring by phase‐shifting digital holography are discussed. Three‐dimensional distributions of correlations of the complex amplitudes and intensities before and after the laser wavelength shift are calculated in numerical simulations where a rough surface is ...
Ichirou Yamaguchi +2 more
openaire +1 more source
Holographic interferometry and digital fringe processing
Journal of Physics D: Applied Physics, 1987Outlines the holographic interferometry techniques used to visualise turbulent forced convective heat transfer from a heated plate located in a wind tunnel. The automatic processing of the fringe fields produced by such methods is then discussed with regard to showing how quantitative data can be obtained quickly and efficiently from them.
J C Hunter, M W Collins
openaire +1 more source
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 ...
openaire +2 more sources
Compressive sensing for digital holographic interferometry
SPIE Proceedings, 2014Compressive sensing (CS) is one of the latest signal processing techniques, which facilitates to reconstruct a complete signal from a small number of randomly chosen signal samples. It has been shown that CS can be applied successfully in digital holography.
B. Deepan, C. Quan, C. J. Tay
openaire +1 more source
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.
Slawomir Pasko +2 more
openaire +1 more source
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. I. Redkorechev +4 more
openaire +1 more source
High-speed digital holographic interferometry for vibration measurement
Applied Optics, 2006A system based on digital holographic interferometry for the measurement of vibrations is presented. A high-power continuous laser (10 W) and a high-speed CCD camera are used. Hundreds of holograms of an object that has been subjected to dynamic deformation are recorded.
Giancarlo, Pedrini +2 more
openaire +2 more sources
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.
Jun, Dong, Chao, Jiang, Shuhai, Jia
openaire +2 more sources
Digital holographic interferometry in flow research
Optics Communications, 1990Abstract A plane-wave holographic interferometric set-up for the quantitative determination of the density distribution existing in the flow field around arbitrarily shaped objects using digital image-processing is presented. By utilizing two reference/reconstruction beams, generated by a slightly misaligned Twyman-Green (T-G) interferometer in the ...
openaire +1 more source
Digital-holographic interferometry with an image-intensifier system
Applied Optics, 2002A method for recording digital holograms on an image intensifier coupled with a CCD sensor is presented. The advantage of the image intensifier is that it can be gated (electronic shutter action produced by controlling of the image intensifier's photocathode voltage). This allows us to record holograms with a short exposure time.
Giancarlo, Pedrini +2 more
openaire +2 more sources