Results 101 to 110 of about 9,024 (217)

Depth-filtered digital holography

Optics Express, 2012
We introduce depth-filtered digital holography (DFDH) as a method for quantitative tomographic phase imaging of buried layers in multilayer samples. The procedure is based on the acquisition of multiple holograms for different wavelengths. Analyzing the intensity over wavelength pixel wise and using an inverse Fourier transform leads to a depth-profile
Nektarios, Koukourakis, Volker, Jaedicke, Adamou, Adinda-Ougba, Sebastian, Goebel, Helge, Wiethoff, Henning, Höpfner, Nils C, Gerhardt, Martin R, Hofmann   +7 more
openaire   +2 more sources

Compressed Sensing: a new framework for signals recovery and its application in Digital Holography

, 2011
In olografia digitale l'informazione di ampiezza e fase del fronte d'onda di un oggetto può essere ottenuta quantitativamente e analizzata in digitale attraverso la simulazione numerica delle leggi di diffrazione.
Memmolo, Pasquale
core  

A holographic system for subsea recording and analysis of plankton and other marine particles (HOLOMAR)

, 2003
We report here details of the design, development, initial testing and field-deployment of the HOLOMAR system for in-situ subsea holography and analysis of marine plankton and nonliving particles.
Player, M.A., P.R. Hobson, V. Chalvidan, J. Watson, Chalvidan, V., Hobson, PR, Alexander, S, Hendry, DC, Chalvidan, V, Nareid, H., Tipping, K, K. Tipping, Lampitt, R.S., J.J. Nebrensky, Player, MA, Tipping, K., A. Pescetto, A. Diard, M.A. Player, Pieroni, GG, S. Serpico, Trucco, A., Watson, J, Trucco, A, R.S. Lampitt, Serpico, S., Nebrensky, JJ, Saw, K, S. Alexander, G.G. Pieroni, Watson, J., S. Gentili, Alexander, S., Diard, A, Hendry, D.C., Saw, K., Hobson, P.R., Foresti, GL, Lampitt, RS, Nareid, H, Craig, G., Nebrensky, J.J., D.C. Hendry, G. Craig, G.L. Foresti, Diard, A., Pescetto, A., Foresti, G.L., Craig, G, Pieroni, G.G., Serpico, S, H. Nareid, A. Trucco, Gentili, S., Gentili, S, Pescetto, A, K. Saw   +56 more
core   +1 more source

A data extraction system for underwater particle holography

, 2000
Pulsed laser holography is an extremely powerful technique for the study of particle fields as it allows instantaneous, noninvasive high-resolution recording of substantial volumes.
Nebrensky, JJ, Craig, G, Lampitt, RS, Nareid, H, Trucco, A, Watson, J, Hobson, PR, Pescetto, A   +7 more
core  

Digital holography with deep learning and generative adversarial networks for automatic microplastics classification

, 2020
Microplastics, which are a major source of pollution in the ocean, need to be accurately detected and monitored. However, the current detection approaches often require complex optical instrumentation and a long time for image processing.
Yeung, CH, ZHU, Y, Lam, EYM
core   +1 more source

Using a Dual‐wavelength Source for Depth Resolution Enhancement in Optical Scanning Holography

, 2011
We use a wavelength selectable source to demonstrate depth resolution enhancement in an optical scanning holography system. Sectional objects separated by 2.5μm in the axial direction are reconstructed with a Fourier‐domain conjugate gradient ...
Edmund Y. Lam, Ke, J, Lam, EYM, Jun Ke
core   +1 more source

Strain Measurement Using Phase-shifting Digital Holography with Two Cameras

EPJ Web of Conferences, 2010
Phase-shifting digital holography is a convenient method to measure displacement and strain distributions. Development of compact and conventional strain distribution measurement equipment for practical use is required for inspection of health monitoring
Morimoto Y., Nishitani R., Fujigaki M.
doaj   +1 more source

Enhanced edge extraction using spiral phase plate in optical scanning holography based on gaussian beam apodization

, 2016
Enhanced edge extraction with high resolution is demonstrated in optical scanning holography (OSH) system by manipulating the radius of the spiral phase plate (SPP) to dampen down the sidelobes of the point spread function ...
Ou, H, Haiyan Ou, Edmund Lam, Bing-Zhong Wang, Wu, Y, Wang, B, Lam, EYM, Yong Wu   +7 more
core   +1 more source

Nearfield Acoustical Holography Research & Application On Compressor & Refrigerator

, 2012
In this paper, an algebraic formulation which expresses the dimensionless rate of entropy generation as a function of the heat exchanger geometry (number of transfer units), the thermal-hydraulic characteristics (friction factor and Colburn j-factor ...
Jianwen, Xu, Fagotti, Fabian, Jiang, Weikang   +2 more
core  

In Situ Holographic Monitoring of Stress Corrosion Dynamics of Alloy 625 in Cl⁻ + S₂O₃²⁻ Solution

Molecules
This study examined the stress corrosion of Alloy 625 in Cl− + S2O32− solutions using digital holography in combination with electrochemical methods. Without elastic tensile stress, intergranular corrosion (IGC) occurred, due to the higher activity of ...
Pengyu Yang, Yunzhou Gu, Fuli Wu, Boyu Yuan, Liang Li, Chao Wang   +5 more
doaj   +1 more source