Results 101 to 110 of about 11,614 (198)

Twisted superfluids in moving frame

, 2020
{Helical waveguide filled by superfluid is shown to transform the linear displacements of reference frame $\vec V$ into rotations of atomic ensemble and vise versa rotations of reference frame $\vec \Omega_{\oplus}$ are the cause of linear displacements ...
Okulov, A. Yu.
core  

The Application of Digital Holographic Speckle Pattern Interferometry to the Structural Condition Study of a Plaster Sample

Photonics
We use non-destructive Digital Holographic Speckle Pattern Interferometry (DHSPI), post-processing image analysis and one-dimensional exponential analysis to visualize, map and describe the structural condition of a plaster-based material.
Kyriaki Kosma, Vivi Tornari
doaj   +1 more source

A Vision-Based Bolt Looseness Detection Method for a Multi-Bolt Connection

Applied Sciences
Many vision-based bolt looseness detection methods that directly observe the bolts have been developed. However, these methods have many limitations in terms of the conditions and processes of their implementation.
Lin Deng, Ye Sa, Xiufang Li, Miao Lv, Sidong Kou, Zhan Gao   +5 more
doaj   +1 more source

Speckle interferometry using fiber optic phase stepping [PDF]

A system employing closed-loop phase-stepping is used to measure the out-of-plane deformation of a diffusely reflecting object. Optical fibers are used to provide reference and object beam illumination for a standard two-beam speckle interferometer ...
Beheim, Glenn, Mercer, Carolyn R.
core   +1 more source

Denoising of Wrapped Phase in Digital Speckle Shearography Based on Convolutional Neural Network

Applied Sciences
Speckle-shearing technology is widely used in defect detection due to its high precision and non-contact characteristics. However, the wrapped-phase recording defect information is often accompanied by a lot of speckle noise, which affects the evaluation
Hao Zhang, Dawei Huang, Kaifu Wang
doaj   +1 more source

Nanometric displacements measurement in piezoelectric polymers using bivariate empirical mode decomposition method in speckle patterns

Revista Elektrón, 2019
In this work we present an optical method for the direct determination of the piezoelectric coefficient of polymeric thin films. This is achieved through the measurement of nanometric mechanical displacements generated in the film when it is excited by ...
Pablo Etchepareborda, Francisco Veiras, Arturo Bianchetti, Alejandro Federico, Martin German Gonzalez   +4 more
doaj  

Analytical procedure for evaluating speckle-effect instrumentation [PDF]

A general analysis suitable for developing speckle effect instruments and a simplified analysis suitable for evaluating laser speckle instrumentation are presented. The simplified analysis is summarized as a list of equations. Several sample applications
Decker, A. J.
core   +1 more source

High-Precision Inspection of Micro-Components Using the Microferoscope: Exploring the Potential of Digital Speckle-Pattern Interferometry

Research and Review Journal of Nondestructive Testing
Reliable inspection of micro-scale components is essential in fields such as electronics and medical device manufacturing. To address this, a method combining digital speckle holography with microscopy has been developed.
Jessica Plassmann, Tim Eis, Ann-Kathrin Molitor, Valentin-Johannes Bastgen, Georg Von freymann, Michael Schuth   +5 more
doaj   +1 more source

Precise Detection of Wrist Pulse Using Digital Speckle Pattern Interferometry. [PDF]

Evid Based Complement Alternat Med, 2018
Zhang H, Wu S, Li W, Wang Y, Dong M, Yang L.   +5 more
europepmc   +1 more source

Laser interferometric measurement of ion electrode shape and charge exchange erosion [PDF]

A projected fringe profilometry system was applied to surface contour measurements of an accelerator electrode from an ion thrustor. The system permitted noncontact, nondestructive evaluation of the fine and gross structure of the electrode.
Macrae, Gregory S., Mercer, Carolyn R.
core   +1 more source