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.

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.

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