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Advanced Optical Methods for Materials Sciences
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Advanced Optical Methods for Materials Sciences

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Optical and Photonic Materials".

Deadline for manuscript submissions: closed (20 October 2022) | Viewed by 4489

Special Issue Editors

Prof. Dr. Virgil-Florin Duma

E-Mail Website
Guest Editor
1. 3OM Optomechatronics Group, Faculty of Engineering, Aurel Vlaicu University of Arad, 310130 Arad, Romania
2. Doctoral School, Polytechnic University of Timisoara, 300006 Timisoara, Romania
Interests: optomechatronics; laser systems; biomedical imaging; optical coherence tomography (OCT); measuring systems; optical metrology; materials study; biomaterials characterization
Special Issues, Collections and Topics in MDPI journals
Dr. Roger M. Groves

E-Mail Website
Guest Editor
Faculty of Aerospace Engineering, Delft University of Technology, 2629 HS Delft, the Netherlands
Interests: optical metrology; fibre optic sensors; ultrasonics; aerospace; NDT; SHM
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Materials studies benefit from a large variety of methods of investigation, including radiation-based techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray investigation, optical and laser scanning microscopy, speckle interferometry, shearography, spectroscopy including imaging spectroscopy, and optical coherence tomography (OCT).

The aim of this Special Issue is to provide a forum for disseminating high-impact research about the development and use of both novel and established optical systems and their methods for materials studies. Such methods include, but are not limited to, those listed above, as well as their combination with other types of investigations, including mechanical testing, analytical approaches or simulations, and finite element analysis (FEA). All domains where advances in materials are of paramount importance are considered, from mechanical to electrical and electronic engineering, as well as to optics and photonics, with applications that range from industrial to biomedical.

All types of contributions, i.e., research papers, reviews and communications, are welcome.

While this forum is open to all researchers, it also provides a selection of papers prepared for the 1st International Conference ‘Advances in 3OM: Opto-Mechatronics, Opto-Mechanics, and Optical Metrology’, Dec. 13–16, 2021 (Timisoara, Romania), organized in celebration of 100 years of the Polytechnic University of Timisoara and of the International Day of Light (IDL).

Prof. Dr. Virgil-Florin Duma
Prof. Dr. Roger M Groves
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Materials studies
  • Imaging techniques
  • Optical metrology
  • Speckle interferometry and shearography
  • Optical coherence tomography (OCT)
  • Fibre optic sensors
  • Spectroscopy and imaging spectroscopy
  • Confocal microscopy
  • X-ray investigations
  • Scanning electron microscopy (SEM)
  • Numerical simulations including finite element analysis (FEA)
  • Experimental studies
  • Modeling of advanced materials

Published Papers (2 papers)

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Research

17 pages, 8633 KiB  
Article
Effect of an Anaerobic Fermentation Process on 3D-Printed PLA Materials of a Biogas-Generating Reactor
by Adrian Cioabla, Virgil-Florin Duma, Corina Mnerie, Ralph-Alexandru Erdelyi, George Mihai Dobre, Adrian Bradu and Adrian Podoleanu
Materials 2022, 15(23), 8571; https://doi.org/10.3390/ma15238571 - 01 Dec 2022
Cited by 5 | Viewed by 1393
Abstract
3D-printed materials are present in numerous applications, from medicine to engineering. The aim of this study is to assess their suitability for an application of interest today, that of testing of 3D-printed polylactic acid (PLA)-based reactors for biogas production using anaerobic digestion. The [...] Read more.
3D-printed materials are present in numerous applications, from medicine to engineering. The aim of this study is to assess their suitability for an application of interest today, that of testing of 3D-printed polylactic acid (PLA)-based reactors for biogas production using anaerobic digestion. The impact of temperature, pH, and aqueous phase on the tested bioreactor is investigated, together with the effect of the gaseous phase (i.e., produced biogas). Two batches of materials used separately, one after another inside the bioreactor were considered, in a realistic situation. Two essential parameters inside the reactor (i.e., pH and temperature) were continuously monitored during a time interval of 25 to 30 days for each of the two biogas-generating processes. To understand the impact of these processes on the walls of the bioreactor, samples of 3D-printed material were placed at three levels: at the top (i.e., outside the substrate), in the middle, and at the bottom of the bioreactor. The samples were analyzed using a non-destructive imaging method, Optical Coherence Tomography (OCT). An in-house developed swept-source (SS) OCT system, master–slave (MS) enhanced, operating at a central wavelength of 1310 nm was utilized. The 3D OCT images related to the degradation level of the material of the PLA samples were validated using Scanning Electron Microscopy (SEM). The differences between the impact of the substrate on samples situated at the three considered levels inside the reactor were determined and analyzed using their OCT B-scans (optical cross-section images). Thus, the impact of the biogas-generating process on the interior of the bioreactor was demonstrated and quantified, as well as the capability of OCT to perform such assessments. Therefore, future work may target OCT for in situ investigations of such bioreactors. Full article
(This article belongs to the Special Issue Advanced Optical Methods for Materials Sciences)
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11 pages, 3632 KiB  
Article
Fabry-Perot Interference Fiber Acoustic Wave Sensor Based on Laser Welding All-Silica Glass
by Wenhua Wang
Materials 2022, 15(7), 2484; https://doi.org/10.3390/ma15072484 - 28 Mar 2022
Cited by 8 | Viewed by 2078
Abstract
Due to the small difference between the thermal expansion coefficients of silica optical fiber and silica glass, they are used as probe materials of optical fiber acoustic wave sensors. According to the light absorption characteristics of a pressure-sensitive silica diaphragm and silica glass, [...] Read more.
Due to the small difference between the thermal expansion coefficients of silica optical fiber and silica glass, they are used as probe materials of optical fiber acoustic wave sensors. According to the light absorption characteristics of a pressure-sensitive silica diaphragm and silica glass, the laser welding of an all-silica Fabry–Perot (FP) interference optical fiber acoustic wave sensor with a CO2 laser is proposed. For understanding the influence of thermal expansion of sealing air in an FP cavity and the drift of interference-intensity demodulation working point of a FP interference acoustic wave sensor, we designed a process for the laser welding of an ultra-thin silica diaphragm and sleeve and optical fiber and sleeve. The exhaust hole of the FP cavity is reserved in the preparation process, and an amplified spontaneous emission light source and a tunable optical-fiber FP filter are introduced to stabilize the working point. The sensor is tested with a 40 kHz sound vibration signal. The results show that the sound pressure sensitivity of the sensor to an acoustic source of 0.02–0.1 W/cm2 is 6.59 mV/kPa. The linearity coefficient is 0.99975, indicating good linearity. Full article
(This article belongs to the Special Issue Advanced Optical Methods for Materials Sciences)
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