scholarly journals Measurements of dynamic surface changes by digital holography for in situ plasma erosion applications

2021 ◽  
Vol 92 (3) ◽  
pp. 033504
Author(s):  
C. D. Smith ◽  
T. M. Biewer ◽  
T. E. Gebhart ◽  
E. G. Lindquist ◽  
C. E. Thomas
Keyword(s):  
Digital Holography ◽  
Dynamic Surface ◽  
Plasma Erosion ◽  
Surface Changes

scholarly journals Calibration Method for Monitoring Hygro-Mechanical Reactions of Pine and Oak Wood by Acoustic Emission Nondestructive Testing

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3775
Author(s):  
Chiara Bertolin ◽  
Lavinia de Ferri ◽  
Filippo Berto
Keyword(s):  
Acoustic Emission ◽  
Brittle Fracture ◽  
Digital Camera ◽  
Calibration Method ◽  
Tensile Tests ◽  
Damage Effect ◽  
Fracture Mechanisms ◽  
Dynamic Surface ◽  
Hardening Mechanism

The main issue of wood is its sensitivity to Relative Humidity (RH) variations, affecting its dimensional stability, and thus leading to crack formations and propagations. In situ structural health monitoring campaigns imply the use of portable noninvasive techniques such as acoustic emission, used for real-time detection of energy released when cracks form and grow. This paper proposes a calibration method, i.e., acoustic emission, as an early warning tool for estimating the length of new formed cracks. The predictability of ductile and brittle fracture mechanisms based on acoustic emission features was investigated, as well as climate-induced damage effect, leading to a strain-hardening mechanism. Tensile tests were performed on specimens submitted to a 50% RH variation and coated with chemicals to limit moisture penetration through the radial surfaces. Samples were monitored for acoustic emission using a digital camera to individuate calibration curves that correlated the total emitted energy with the crack propagation, specifically during brittle fracture mechanism, since equations provide the energy to create a new surface as the crack propagates. The dynamic surface energy value was also evaluated and used to define a Locus of Equilibrium of the energy surface rate for crack initiation and arrest, as well as to experimentally demonstrate the proven fluctuation concept.

Direct quantitative imaging of the writing stage in a photosensitive azopolymer by digital holography

Soft Matter ◽  
2019 ◽  
Vol 15 (39) ◽  
pp. 7809-7813 ◽  
Author(s):  
V. Pagliarulo ◽  
A. Calabuig ◽  
S. Grilli ◽  
P. Ferraro
Keyword(s):  
Thin Films ◽  
Real Time ◽  
Surface Relief ◽  
Digital Holography ◽  
Light Exposure ◽  
Quantitative Imaging ◽  
Continuous Light ◽  
Full Field ◽  
Surface Relief Grating

In this paper, we demonstrated that the gradual formation of a surface relief grating (SRG) in azopolymer thin films under continuous light exposure could be directly observed in situ and in real-time, allowing full-field characterization.

Optical fatigue investigation with in situ time resolved digital holography

2019 ◽  
Author(s):  
Balys Momgaudis ◽  
Linas Smalakys ◽  
Mikas Vengris ◽  
Andrius Melninkaitis
Keyword(s):  
Digital Holography ◽  
Time Resolved

In Situ Time-Resolved Dynamic Surface Events on the Pt/C Cathode in a Fuel Cell under Operando Conditions

2007 ◽  
Vol 46 (23) ◽  
pp. 4310-4315 ◽  
Author(s):  
Mizuki Tada ◽  
Shigeaki Murata ◽  
Takahiko Asakoka ◽  
Kazutaka Hiroshima ◽  
Kazu Okumura ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Dynamic Surface ◽  
Time Resolved

In-situ Measurement of GaAs Optical Constants and Surface Quality, as Functions of Temperature

1991 ◽  
Vol 222 ◽  
Author(s):  
Huade Yao ◽  
Paul G. Snyder
Keyword(s):  
Room Temperature ◽  
Optical Constants ◽  
Molecular Beam ◽  
Elevated Temperatures ◽  
Native Oxide ◽  
Time Data ◽  
Gaas Sample ◽  
Optical Thermometer ◽  
Surface Changes

ABSTRACTIn-situ spectroscopic ellipsometry (SE) was applied to monitor GaAs (100) surface changes induced at elevated temperatures inside an ultrahigh vacuum (UHV) chamber (<1×10−9 torr base pressure, without As overpressure). The real time data showed clearly the evolution of the native-oxide desorption at ∼577°C, on a molecular-beam-epitaxy (MBE)-grown GaAs (100) surface. In addition, surface degradation was found before and after the oxide desorption. A clean and smooth surface was obtained from an arsenic-capped, MBE-grown GaAs sample, after the arsenic coating was evaporated at ∼350 °C inside the UHV. Pseudodielectric functions <ε>GaAs, from 1.6 eV to 4.5 eV, were obtained through the SE measurements, from this oxide-free surface, at temperatures ranging from room temperature (RT) to ∼610 °C. These <ε> data were used as reference data to develop an algorithm for determining surface temperatures from in-situ SE measurements, thus turning the SE instrument into a sensitive optical thermometer.

scholarly journals In-situ visualization, monitoring and analysis of electric field domain reversal process in ferroelectric crystals by digital holography

2004 ◽  
Vol 12 (9) ◽  
pp. 1832 ◽  
Author(s):  
Simonetta Grilli ◽  
Pietro Ferraro ◽  
Melania Paturzo ◽  
Domenico Alfieri ◽  
Paolo De Natale ◽  
...  
Keyword(s):  
Electric Field ◽  
Digital Holography ◽  
Ferroelectric Crystals ◽  
Reversal Process ◽  
In Situ Visualization ◽  
Domain Reversal

In Situ Kinetics of Layer-by-Layer Assembled Nonlinear-Optical-Active Amphiphiles from Dynamic Surface Force Measurements

Langmuir ◽  
2004 ◽  
Vol 20 (20) ◽  
pp. 8735-8739 ◽  
Author(s):  
Niña G. Caculitan ◽  
Paul H. Scudder ◽  
Analiz Rodriguez ◽  
Joanna L. Casson ◽  
Hsing-Lin Wang ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Surface Force ◽  
Layer By Layer ◽  
Force Measurements ◽  
Dynamic Surface ◽  
Kinetics Of

scholarly journals Application of in situ digital holography to the study of the effect of a magnetic field on the anodic dissolution of iron in thichloroacetic acid

2006 ◽  
Vol 71 (1) ◽  
pp. 67-73 ◽  
Author(s):  
Xuegeng Yang ◽  
Shenhao Chen ◽  
Chao Wang ◽  
LI. Liang
Keyword(s):  
Magnetic Field ◽  
Acid Solution ◽  
Anodic Dissolution ◽  
Potentiodynamic Polarization ◽  
Trichloroacetic Acid ◽  
Digital Holography ◽  
Polarization Method ◽  
Trichloroacetic Acid Solution ◽  
The Magnetic Field

The effect of a magnetic field on the anodic dissolution of iron in 1.0 mol dm-3 trichloroacetic acid solution was studied by the potentiodynamic polarization method and in situ digital holography. It was found that the magnetohydrodynamic force increased the mass transport, which resulted in a faster anodic dissolution of iron. The effect of the magnetic field was analyzed by holograms and is discussed in terms of the magnetohydrodynamic force.

Ocular Surface Changes in Laser in situ Keratomileusis-induced Neurotrophic Epitheliopathy

2004 ◽  
Vol 20 (6) ◽  
pp. 803-809 ◽  
Author(s):  
Giacomo Savini ◽  
Piero Barboni ◽  
Maurizio Zanini ◽  
Scheffer C G Tseng
Keyword(s):  
Ocular Surface ◽  
Laser In Situ Keratomileusis ◽  
Surface Changes
Sign in / Sign up

Export Citation Format

Share Document