| People | Locations | Statistics |
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| 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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Hokkanen, Ari
VTT Technical Research Centre of Finland
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2024Material engineering and application of hybrid biomimetic-de novo designed elastin-like polypeptidescitations
- 2024Respiratory rate monitoring with cellulose optical fiber
- 2022Optical properties of an organic-inorganic hybrid film made of regenerated cellulose doped with light-scattering TiO2 particlescitations
- 2022Hybrid films from cellulose nanomaterials—properties and defined optical patternscitations
- 2021Cellulose optical fiber
- 2021Cellulose optical fiber
- 2020Elastic and fracture properties of free-standing amorphous ALD Al2O3 thin films measured with bulge testcitations
- 2018Elastic and fracture properties of free-standing amorphous ALD Al2O3 thin films measured with bulge testcitations
- 2008Real-time analysis of PCR inhibition on microfluidic materialscitations
- 2007Use of brazing technique for manufacturing of high temperature fibre optical temperature and displacement transducercitations
- 2007Coating integrated optical fibres for monitoring of boiler heat transfer surfacescitations
- 2006Design and fabrication of integrated solid-phase extraction-zone electrophoresis microchipcitations
- 2006Tunable hydrophilicity on a hydrophobic fluorocarbon polymer coating on siliconcitations
Places of action
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article
Coating integrated optical fibres for monitoring of boiler heat transfer surfaces
Abstract
High temperature corrosion is often a problem in biomasscombustion andwaste incineration boilers. Criticalcomponents are heat transfer surfaces,such as waterwalls and superheaters. Instead of using more corrosionresistant high alloy steels for critical components moreeconomical low alloysteels can be protected by coatings.These coatings can be applied bythermal spraytechniques. This work investigates the possibility ofintegrating thin copper jacketed optical sensing fibresin this kind ofcoatings during the spray process. Thiskind of sensing fibres would providenew methods formanaging boiler life and controlling the combustionprocess.The coating embedded fibres can be used forexample to locate hot spots andplaces where corrosionand erosion are destroying the coating. In this workthecheapest possible method (direct spraying) for embeddingthe fibre waschosen even if it was known that this isclose to the limits of what thefibre can sustain inorder to retain its optical and mechanical integrity.Theresults of the direct spraying method are presented andsome moreadvanced methods will be discussed. Methods formonitoring the state of thesprayed coating can extendfrom simple on-off methods to advanced distributedsensing methods. On-off methods mean monitoring the lighttransmission ofthe embedded fibre; when the corrosion orerosion reaches the fibre anddestroys it the lighttransmission will cease. Using optical time domainreflectometry (OTDR) also onset of fibre destruction canbe observed as wellas the locations of these criticalpoints. More advanced techniques are theuse of in-fibreBragg gratings for temperature and strain monitoring andtheuse of distributed temperature sensing (DTS) for hotspot detection. BothOTDR and DTS techniques will bepresented in this work. The work presentedwas mainlydone in the CEC funded Craft project PROCOMO (Protectivecoatingswith combined monitoring system to controlprocess conditions in boilers).The DTS demo shown inthis work was carried out within the STYX project,whichwas a part of the Finnish nuclear safety research.