| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Thienpont, Hugo
Vrije Universiteit Brussel
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (83/83 displayed)
- 2023Design and manufacturing of aspherical GaAs-SILs for a versatile optical semiconductor failure analysis system
- 2023Microstructured Optical Fiber Made From Biodegradable and Biocompatible Poly(D,L-Lactic Acid) (PDLLA)citations
- 2022Fabrication of large-scale scaffolds with microscale features using light sheet stereolithographycitations
- 2021Increasing the Microfabrication Performance of Synthetic Hydrogel Precursors through Molecular Designcitations
- 2021Increasing the microfabrication performance of synthetic hydrogel precursors through molecular designcitations
- 2021Monitoring of Torque Induced Strain in Composite Shafts with Embedded and Surface-Mounted Optical Fiber Bragg Gratingscitations
- 20203D direct laser writing of microstructured optical fiber tapers on single-mode fibers for mode-field conversioncitations
- 2020Selective liquid filling of photonic crystal fibers using two-photon polymerization lithography without post-exposure developmentcitations
- 2020On the Characterization of Novel Step-Index Biocompatible and Biodegradable poly(D,L-lactic acid) Based Optical Fibercitations
- 2019Amorphous random copolymers of lacOCA and manOCA for the design of biodegradable polyesters with tuneable propertiescitations
- 2019Amorphous random copolymers of lacOCA and manOCA for the design of biodegradable polyesters with tuneable propertiescitations
- 2019Poly(D, L-Lactic Acid) (PDLLA) Biodegradable and Biocompatible Polymer Optical Fibercitations
- 2019Electro-Absorption Modulator vertically integrated on a VCSEL: microstrip-based high-speed electrical injection on top of a BCB layercitations
- 2018Clear to clear laser welding for joining thermoplastic polymers: A comparative study based on physicochemical characterizationcitations
- 2018Ultrathin Poly-DL-Lactic Membranes for Corneal Endothelial Transplantation
- 2018Localized optical- quality doping of graphene on silicon waveguides through a TFSA- containing polymer matrixcitations
- 2018Ring opening copolymerisation of lactide and mandelide for the development of environmentally degradable polyesters with controllable glass transition temperaturescitations
- 2017Dynamic 3D strain measurements with embedded micro-structured optical fiber Bragg grating sensors during impact on a CFRP couponcitations
- 2017Oxide-confined VCSELs fabricated with a simple self-aligned process flowcitations
- 2017Single lithography-step self-aligned fabrication process for Vertical-Cavity Surface-Emitting Laserscitations
- 2016Replication of self-centering optical fiber alignment structures using hot embossingcitations
- 2016Self-aligned BCB planarization method for high frequency signal injection in a VCSEL with an integrated modulatorcitations
- 2016Determination of the radial profile of the photoelastic coefficient of polymer optical fibers
- 2016Hot-embossing replication of self-centering optical fiber alignment structures prototyped by deep proton writingcitations
- 2016Improving food safety with optical screening
- 2016Spectroscopic monitoring and melt pool temperature estimation during the laser metal deposition processcitations
- 2016Deep proton writing with 12 MeV protons for rapid prototyping of microstructures in polymethylmethacrylatecitations
- 2016Optofluidic multi-measurement system for the online monitoring of lubricant oilcitations
- 2016Design and prototyping of self-centering optical single-mode fiber alignment structurescitations
- 2016Chapter 21 – Biodegradable polyesters: from monomer to application
- 2015Microstructured optical fiber bragg grating as an internal three-dimensional strain sensor for composite laminatescitations
- 2015Algorithms for determining the radial profile of the photoelastic coefficient in glass and polymer optical fibrescitations
- 2015Laser ablation of micro-photonic structures for efficient light collection and distributioncitations
- 2015Spectroscopic monitoring and melt pool temperature estimation during the laser metal deposition process
- 2015Iron speciation in soda-lime-silica glass: a comparison of Xanes and UV-vis-NIR spectroscopycitations
- 2014Challenges in the fabrication of fibre Bragg gratings in silica and polymer
- 2014Microstructured optical fiber Bragg grating-based strain and temperature sensing in the concrete buffer of the Belgian supercontainer conceptcitations
- 2014Microstructured Optical Fiber Bragg Grating Sensors for Structural Health Monitoring Applications
- 2014On a possible method to measure the radial profile of the photoelastic constant in step-index optical fiber
- 2014Internal strain monitoring in composite materials with embedded photonic crystal fiber Bragg gratings
- 2014Plastic optical fibers for sensing applications
- 2013Low-coherence interferometry with polynomial interpolation on Compute Unified Device Architectur-enabled graphics processing units
- 2013Opportunities for Structural Health Monitoring of Composite Material Structures with Novel Microstructured Optical Fiber Sensors
- 2013Embedded fiber Bragg gratings in photonic crystal fiber for cure cycle monitoring of carbon fiber-reinforce polymer materials
- 2013Gloss, hydrophobicity and surface texture of papers with organic nanoparticle coatings
- 2013Influence of measurement noise on the determination of the radial profile of the photoelastic coefficient in step-index optical fibres
- 2013Opportunities for Structural health monitoring of composite material structures with novel microstructured optical fiber sensors
- 2013B-Calm: An open-source multi-GPU-based 3D-FDTD with multi-pole dispersion for plasmonics
- 2012B-CALM: An Open-Source GPU-based 3D-FDTD with Multi-Pole Dispersion for Plasmonics
- 2012Monitoring of gamma-irradiated Yb-doped optical fibers through pump induce refractive index changes effect
- 2012Supercontinuum generation in all-solid photonic crystal fiber with low index core
- 2012Mechanical reliability of microstructured optical fibers – a comparative study of tensile and bending strength
- 2012Towards Flexible Photonic Sensing Skins with Optical Fiber Sensors
- 2012Dental composite resins: measuring the polymerization shrinkage using optical fiber Bragg grating sensor
- 2011Photonic crystal fiber Bragg grating based sensors: opportunities for applications in healthcarecitations
- 2011Optical and Digital Image Processing: Fundamentals and Applications
- 2011Microstructured optical fiber sensors embedded in a laminate composite for smart material applications
- 2011Photonic crystal fiber Bragg grating based sensors-opportunities for applications in healthcare
- 2011Photonic crystal fiber Bragg grating based sensorscitations
- 2011Large-mode-area photonic crystal fiber with double lattice constant structure and low bending loss
- 2010High-contrast all-glass volumetric photonic crystal
- 2010Populating multi-fiber fiberoptic connectors using an interferometric measurement of fiber tip position and facet quality
- 2010Design and fabrication of embedded micro-mirror inserts for out-of-plane coupling in PCB-level optical interconnectionscitations
- 2010Design and fabrication of embedded micro-mirror inserts for out-of-plane coupling in PCB-level optical interconnects
- 2009Response of Fiber Bragg Gratings in Microstructured and Bow Tie Fibers Embedded in Laminated Composite
- 2009Ultra flat supercontinuum generation in silicate dual core microstructured fiber
- 2009Fiber Bragg Gratings in Microstructured Optical Fibers for Stress Monitoring
- 2009Benchmarking the response of Bragg gratings written in microstructured and bow tie fiber embedded in composites
- 2009Transversal load sensing with fiber Bragg gratings in microstructured optical fibers
- 2009Fiber Bragg gratings in microstructured optical fibers for stress monitoring
- 2008Studies on polymer optical microstructures refractive index distribution by means of interferometric tomography system
- 2008Investigations of bending loss oscillations in large mode area photonic crystal fibers
- 2008Flexible materials for optical applications
- 2008Functional polymer materials for optical applications
- 2008Hot embossing of microoptical components prototyped by deep proton writing
- 2008Soft glass photonic crystal fibers for supercontinuum generation
- 2008Embedded Micro-Mirror inserts for optical printed circuit boards
- 2008Deep Proton Writing: A tool for rapid prototyping of polymer micro-opto-mechanical modules
- 2007Silicate photonic crystal fibers with rectangular lattice and elliptical holes
- 2007Deep Proton Writing: A tool for rapid prototyping polymer micro-opto-mechanical modules
- 2007Optimal radii of photonic crystal holes within DBR mirrors in long wavelength VCSEL
- 2006Laser Ablation of Parallel Optical Interconnect Waveguides
- 2002Polarization Behavior of Vertical-Cavity Surface-Emitting Lasers under the Influence of In-Plane Anisotropic Strain
Places of action
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thesis
Improving food safety with optical screening
Abstract
Food safety has become increasingly important in our society. Today a major concern of the agriculture industry is the screening of two specific types of food contaminants imposing a key threat to health, being acrylamide formed during high-temperature processing and mycotoxins produced by toxic fungi. This doctoral thesis investigates the use of spectroscopic sensing techniques to non-destructively detect these harmful products, avoiding their presence in the food chain. Particularly, our research contains three major parts, being the monitoring of the acrylamide formation in potatoes, the sensing of the presence of mycotoxins in cereals and the implementation of the spectroscopic detection techniques in real-time scanning configurations. We first investigate the use of spatially-resolved spectroscopy to monitor the acrylamide formation in potatoes. Our research reveals the influence of the acrylamide precursors on the light scattering behaviour, allowing to identify raw potatoes unsuited for high-temperature processing. In addition, we successfully validate this detection methodology in a proof-of-concept demonstrator, enabling an industrial integration in scanning-based sorting machines.To tackle our second objective, we investigate the use of reflection and fluorescence spectroscopy for the detection of respectively non-fluorescent and fluorescent mycotoxins. To sense the presence of non-fluorescent mycotoxins, we introduce a two-stage diffuse reflection measurement methodology. The proposed methodology allows to efficiently define the optimal detection wavelengths to sense the localized contamination-level, while enabling a pre-sorting of the samples. As a case-study, the sensing of deoxynivalenol in cereals is successfully demonstrated and integrated in a scanning-based proof-of-concept demonstrator. To detect fluorescent mycotoxins, we introduce two-photon induced fluorescence spectroscopy as a promising sensing tool and compare its performance to one-photon induced fluorescence spectroscopy. We develop a measurement configuration enabling the investigation of both types of fluorescence, define the optimal excitation wavelengths, and successfully demonstrate the detection of the localized aflatoxin-contamination.Finally, we propose an advanced optical scanning configuration, paving the way to integrate two-photon induced fluorescence in a commercial sorting machine. Particularly, we optimized the excitation laser power density and the fluorescence detection signal intensity by the integration of a tunable lens and a novel optical collection system. We conclude that our research demonstrates the use of advanced optical spectroscopy as a valuable tool to improve food safety, paving the way to an industrial, accurate and non-destructive detection.