Results 211 to 220 of about 28,756 (270)

In-line digital holographic interferometry

Applied Optics, 1998
An optical system based on in-line digital holography for the evaluation of deformations is described. In-line holograms are recorded on a CCD chip. The problem of overlapping twin images typical for the in-line arrangement is solved by digital reconstruction and filtering of the unwanted wave fronts. Two separate interferograms of an object under test
G, Pedrini, P, Fröning, H, Fessler, H J, Tiziani   +3 more
openaire   +2 more sources

Multiple phase extraction using graphics processing unit assisted unitary transformation method in digital holographic interferometry.

Applied Optics, 2022
The article presents a method to estimate multiple phase maps from a moiré fringe signal obtained using digital holographic interferometry. The proposed method uses a unitary transformation based signal subspace approach, and shows high robustness ...
J. Ramaiah, Rajshekhar Gannavarpu
semanticscholar   +1 more source

On the anisotropy of decorrelation noise in digital holographic interferometry

Digital Holography and 3-D Imaging 2022, 2022
This paper discusses on the anisotropy of decorrelation noise in digital holographic interferometry. Theory is supported by experimental results demonstrating the noise is anisotropic.
Erwan Meteyer, C. Pezerat, P. Picart
semanticscholar   +1 more source

Displacement derivative analysis using deep learning in digital holographic interferometry

Digital Holography and 3-D Imaging 2022, 2022
In this article, we present deep learning approach to estimate displacement derivatives in digital holographic interferometry. The results show the capability of the proposed method on noisy experimental fringes.
Allaparthi Venkata Satya Vithin, J. Ramaiah, Dhruvam Pandey, Rajshekhar Gannavarpu   +3 more
semanticscholar   +1 more source

High speed digital holographic interferometry

SPIE Proceedings, 2006
A 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 (1 kHz) are used. Hundreds of holograms of an object that has been subjected to dynamic deformation are recorded.
G. Pedrini, M. E. Gusev, W. Osten
openaire   +1 more source

3D deformation measurement in digital holographic interferometry using a multitask deep learning architecture.

Journal of The Optical Society of America A-optics Image Science and Vision, 2021
The extraction of absolute phase from an interference pattern is a key step for 3D deformation measurement in digital holographic interferometry (DHI) and is an ill-posed problem. Estimating the absolute unwrapped phase becomes even more challenging when
Krishna Sumanth Vengala, Naveen Paluru, Rama Krishna Sai Subrahmanyam Gorthi   +2 more
semanticscholar   +1 more source

Non-invasive deformation metrology using subspace analysis in digital holographic interferometry

Measurement science and technology, 2021
For non-invasive precision measurement of deformation using digital holographic interferometry (DHI), reliable estimation of interference phase from complex fringe signal is required.
J. Ramaiah, Rajshekhar Gannavarpu
semanticscholar   +1 more source

Digital Holographic Interferometry for Temperature Measurement of Flame without Phase Unwrapping

Journal of the Institution of Electronics and Telecommunication Engineers, 2021
Fast and precise measuring technique is required for vigilant monitoring of risk assessment of fire. In the present work, digital holographic interferometry has been applied for temperature profile measurement of single and coalesced candle flames ...
N. Jabeen, A. K. Nirala
semanticscholar   +1 more source

Refocus criterion from image-plane speckle correlation in digital holographic interferometry.

Applied Optics
In digital holography and holographic interferometry, refocusing to the correct image plane can be challenging and may be obtained by various metrics.
Mikael Sjödahl, Pascal Picart
semanticscholar   +1 more source

High-speed measurement of mechanical micro-deformations with an extended phase range using dual-wavelength digital holographic interferometry.

Applied Optics, 2021
The implementation of a digital holographic interferometry setup for high-speed micro-deformation measurement is presented. This proposal uses a dual-wavelength recording strategy to reconstruct micro-deformations up to 4.85 µm with no phase wrapping ...
Natalia Múnera, C. Trujillo, J. Garcia-Sucerquia   +2 more
semanticscholar   +1 more source