scholarly journals Comparative Analysis of Object Digitization Techniques Applied to the Characterization of Deformed Materials in Ballistic Tests

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5017
Author(s):  
Filipe Dmengeon Pedreiro Balbino ◽  
Khrissy Aracélly Reis Medeiros ◽  
Carlos Roberto Hall Barbosa
Keyword(s):  
Comparative Analysis ◽  
Three Dimensional ◽  
Three Dimensional Reconstruction ◽  
Optical Scanning ◽  
Structured Light Scanner ◽  
Dimensional Reconstruction ◽  
Random Sample Consensus ◽  
Ballistic Tests ◽  
And Diffusion

Several three-dimensional scanning methods have been developed and improved over the past 40 years. The peculiarities of each technique, associated with the computational advances of the period, allowed the increasing application and diffusion of the technology in several sectors, among them those related to metrology in ballistics and the testing of protective materials. The specific goal of such ballistic tests is to estimate the depth of indentation caused by projectiles. In particular, this study presents a comparative analysis between two three-dimensional optical scanning methods, taking into account the same object of interest. The comparative analysis was based on reference planes detected by Random Sample Consensus methodology in each cloud. By comparing the results of the different techniques, it was found for this case that three-dimensional reconstruction by stereo images estimated values closer to the real ones in comparison to those estimated by the structured light scanner, mainly due to the fact that, for three-dimensional reconstruction, the image acquisition was conducted statically.

scholarly journals Polarization-Sensitive Digital Holographic Imaging for Characterization of Microscopic Samples: Recent Advances and Perspectives

2020 ◽  
Vol 10 (13) ◽  
pp. 4520
Author(s):  
Giuseppe Coppola ◽  
Maria Antonietta Ferrara
Keyword(s):  
Quantitative Evaluation ◽  
State Of The Art ◽  
Imaging Technique ◽  
Three Dimensional ◽  
Three Dimensional Reconstruction ◽  
Comprehensive Review ◽  
Holographic Imaging ◽  
Dimensional Reconstruction ◽  
Micrometer Scale

Polarization-sensitive digital holographic imaging (PS-DHI) is a recent imaging technique based on interference among several polarized optical beams. PS-DHI allows simultaneous quantitative three-dimensional reconstruction and quantitative evaluation of polarization properties of a given sample with micrometer scale resolution. Since this technique is very fast and does not require labels/markers, it finds application in several fields, from biology to microelectronics and micro-photonics. In this paper, a comprehensive review of the state-of-the-art of PS-DHI techniques, the theoretical principles, and important applications are reported.

Precision serial lapping, imaging and three-dimensional reconstruction of minus-cement and post-cementation intergranular pore-systems in the Penrith Sandstone of north-western England

1995 ◽  
Vol 59 (395) ◽  
pp. 213-220 ◽  
Author(s):  
Mark R. Cooper ◽  
Robert H. Hunter
Keyword(s):  
Three Dimensional ◽  
Three Dimensional Reconstruction ◽  
Pore System ◽  
Intergranular Porosity ◽  
Data Presentation ◽  
Dimensional Reconstruction ◽  
Permeability Studies ◽  
Definition Of ◽  
North Western

AbstractThe application of serial lapping, imaging and image processing, and three-dimensional reconstruction techniques are discussed using the quartz-cemented Penrith Sandstone as an example. The study involves the characterization of the three-dimensional pore system microgeometry using combined back-scattered scanning electron and cathodoluminescence microscopy and focuses on the definition of post-compaction and post-cementation intergranular porosity networks. Sample preparation, section spacing and re-orientation and data presentation are described. Aspects of the application of serial section datasets and their limitations are discussed in relation to permeability studies.

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