Results 131 to 140 of about 2,784,941 (298)

Crack Detection by Optical Voice Recorder Based on Digital Holography

Photonic Sensors, 2019
The detection of crack on materials is an important issue in industry. On the contrary to conventional methods, such as manual inspection, sensor detection, and image processing techniques, a new simple method to detect the crack is proposed with optical
Gülhan Ustabaş Kaya, Zehra Saraç
doaj   +1 more source

Near-Field Radio Holography of Large Reflector Antennas

, 2007
We summarise the mathematical foundation of the holographic method of measuring the reflector profile of an antenna or radio telescope. In particular, we treat the case, where the signal source is located at a finite distance from the antenna under test,
Baars, J. W. M., Lopez-Perez, J. A., Lucas, R., Mangum, J. G.   +3 more
core   +1 more source

High-speed full-color computer-generated holography using a digital micromirror device and fiber-coupled RGB laser diode [PDF]

, 2023
Shuhei Yoshida
openalex   +1 more source

Lensless single-shot dual-wavelength digital holography with sub-pixel resolution and centimeter depth range [PDF]

APL Photonics
Lensless single-shot dual-wavelength digital holography is resolution limited by the pixel-size of the camera and often has an insufficient depth range.
Huangcheng Shangguan, H. Paul Urbach, Jeroen Kalkman   +2 more
doaj   +1 more source

Analysis of Polarization States of the Light Wave Using FMCW Digital Holography with Two Orthogonally Linearly Polarized Reference Waves

, 2021
正幸 横田, 達也 石川, 善伸 青木   +2 more
openalex   +2 more sources

Investigation of dynamic of unconsolidated materials using two-color digital holography [PDF]

, 2010
Patrice Tankam, Pascal Picart, Denis Mounier, Jean Pierre Boileau, Vincent Tournat, V. E. Gusev   +5 more
openalex   +1 more source

Deep learning bimodal frequency-selective digital holography by using a confocal dual-beam setup

New Journal of Physics
This paper proposes a bimodal digital holography technique based on deep learning, marking the first application of neural networks in frequency-selective holographic reconstruction.
Wanbin Zhang, Yanchen Ren, Yijian Feng, Xiangdong Sun, Jiangnan Hu, Weiyong Xing, Zhanjun Zhang   +6 more
doaj   +1 more source

Backscatter digital holography of microparticles

Optics Express, 2013
This work investigates a method for digital holographic imaging of microparticles. Traditional digital holographic techniques use a particle's forward scattered light to form the hologram, whereas here we use the backscattered light. Images of a particle are then computationally reconstructed from the backscatter hologram, and several examples of such ...
Nava R, Subedi, Nicholas B, Fowler, Matthew J, Berg   +2 more
openaire   +2 more sources

Zooming algorithms for Digital Holography

Journal of Physics: Conference Series, 2010
Digital Holography is an imaging modality made up of two parts: (i) Recording an interference pattern on a CCD, where an object wave field and a known reference wave are coincident and extracting the complex object wave field from this interference pattern and (ii) Replaying or reconstructing the hologram on a computer by simulating the propagation of ...
Hennelly, Bryan M., Kelly, Damien, Pandey, Nitesh, Monaghan, David   +3 more
openaire   +2 more sources

A new autofocus method based on angular spectrum method in digital holography [PDF]

, 2015
Zhaomin Wang, Weijuan Qu, Fang Yang, Yongfu Wen, Anand Asundi   +4 more
openalex   +1 more source