An advanced methodology for 3D digitization and nondestructive evaluation of monuments

2021 ◽  
Author(s):  
Dimitrios A. Exarchos ◽  
Ilias K. Tragazikis ◽  
Athanasios Mitsikostas ◽  
Anastasios C. Mpalaskas ◽  
Aristeidis Vasios ◽  
...  
Keyword(s):  
Nondestructive Evaluation ◽  
3D Digitization

Three-dimensional image analysis and visualization in confocal light microscopy

1993 ◽  
Vol 51 ◽  
pp. 158-159
Author(s):  
J. K. Samarabandu ◽  
R. Acharya ◽  
D. R. Pareddy ◽  
P. C. Cheng
Keyword(s):  
Depth Perception ◽  
Computer Graphic ◽  
Three Dimensional ◽  
Cellular Organization ◽  
Data Set ◽  
Computational Burden ◽  
Interactive Operation ◽  
Cell Organization ◽  
Confocal Images ◽  
3D Digitization

In the study of cell organization in a maize meristem, direct viewing of confocal optical sections in 3D (by means of 3D projection of the volumetric data set, Figure 1) becomes very difficult and confusing because of the large number of nucleus involved. Numerical description of the cellular organization (e.g. position, size and orientation of each structure) and computer graphic presentation are some of the solutions to effectively study the structure of such a complex system. An attempt at data-reduction by means of manually contouring cell nucleus in 3D was reported (Summers et al., 1990). Apart from being labour intensive, this 3D digitization technique suffers from the inaccuracies of manual 3D tracing related to the depth perception of the operator. However, it does demonstrate that reducing stack of confocal images to a 3D graphic representation helps to visualize and analyze complex tissues (Figure 2). This procedure also significantly reduce computational burden in an interactive operation.

Effects of contact gap on nondestructive evaluation using magnetic measurement for ferromagnetic steel

2020 ◽  
Vol 64 (1-4) ◽  
pp. 969-975
Author(s):  
Hiroaki Kikuchi ◽  
Yuki Sato
Keyword(s):  
Magnetic Flux ◽  
Nondestructive Evaluation ◽  
Effective Permeability ◽  
Magnetic Circuit ◽  
Magnetic Measurement ◽  
Air Gap ◽  
Motive Force ◽  
Hysteresis Curve ◽  
Evaluation Technique ◽  
Ferromagnetic Steel

We investigated effects of contact gap on magnetic nondestructive evaluation technique using a magnetic single-yoke probe. Firstly, we evaluated hysteresis curves and impedance related to permeability of the material measured by a single-yoke probe, when an air gap length between the probe and specimens changes. The hysteresis curve gradually inclines to the axis of the magneto-motive force and magneto-motive force at which the magnetic flux is 0 decreases with increasing the gap length. The effective permeability also decreases with increasing the gap thickness. The incremental of gap thickness increases the reluctance inside the magnetic circuit composed of the yoke, specimen and gap, which results in the reduction of flux applying to specimen.

A Framework for Computational Nondestructive Evaluation of Degraded Composites with Microscale Discontinuities

2020 ◽  
Vol 78 (1) ◽  
pp. 104-118
Author(s):  
Sajan Shrestha ◽  
◽  
Vahid Tavaf ◽  
Sourav Banerjee
Keyword(s):  
Nondestructive Evaluation

Nondestructive Evaluation of Additively Manufactured Metal Components with an Eddy Current Technique

2018 ◽  
Author(s):  
Benjamin Schneider ◽  
◽  
Mohammad Rashid Bin Mohammad Shoaib ◽  
Hossein Taheri ◽  
Lucas Koester ◽  
...  
Keyword(s):  
Nondestructive Evaluation ◽  
Eddy Current ◽  
Current Technique
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