Detection of corrosion on silvered glass reflectors via image processing
A novel characterization technique based on image analysis is presented, intended to complement state-of-the-art reflectometer measurements. The technique is developed by experts from different laboratories (OPAC, AGC, CEA and LNEG), which subsequently conduct two Round Robin experiments on corroded...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-03-01
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| Series: | Results in Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590123024020243 |
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| author | Florian Wiesinger Sarah Baghouil Estelle Le Baron Romain Collignon Filipa Santos Teresa C. Diamantino Isabel Catarino Jorge Facão Cristina Ferreira Soraia Páscoa Florian Sutter Aránzazu Fernández-García Johannes Wette |
| author_facet | Florian Wiesinger Sarah Baghouil Estelle Le Baron Romain Collignon Filipa Santos Teresa C. Diamantino Isabel Catarino Jorge Facão Cristina Ferreira Soraia Páscoa Florian Sutter Aránzazu Fernández-García Johannes Wette |
| author_sort | Florian Wiesinger |
| collection | DOAJ |
| description | A novel characterization technique based on image analysis is presented, intended to complement state-of-the-art reflectometer measurements. The technique is developed by experts from different laboratories (OPAC, AGC, CEA and LNEG), which subsequently conduct two Round Robin experiments on corroded solar reflectors for validation. Regarding the inter-comparability, it is found that parameters like the corrosion spot density or the penetration maximum on coated edges exhibit an average coefficient of variation of 62.6 % and 54.9 %. Better agreement is found for parameters like the total corroded area and the maximum edge corrosion penetration, with coefficients of variation of 14.3 % and 13.4 %, respectively.The developed methodology is further applied during a 68-month lasting outdoor exposure campaign of two types of solar reflectors at two representative sites, one exhibiting corrosivity class C2 and the other C3. On the commercial coating RL1, a total corroded area of 59 mm² and 426 mm² is measured after the outdoor exposure on the C2 and the C3 site, respectively, while on the novel low-lead coated reflector RL3 corresponding values are 280 mm² and 1308 mm². This shows the superior quality of the coating RL1 in terms of corrosion resistance. Furthermore, the analysis highlights the importance of proper edge sealing for corrosion protection, since corrosion penetration is increased by a factor between 1.3 and 4.0 if the edges are unprotected. The reflectance decrease after the outdoor exposure is regarded as negligible (0.000 - 0.005), thus not permitting any of the conclusions that are made from the novel image analysis technique. |
| format | Article |
| id | doaj-art-87070f0032be461aa24d00193a492cd4 |
| institution | Kabale University |
| issn | 2590-1230 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Engineering |
| spelling | doaj-art-87070f0032be461aa24d00193a492cd42025-01-12T05:25:37ZengElsevierResults in Engineering2590-12302025-03-0125103781Detection of corrosion on silvered glass reflectors via image processingFlorian Wiesinger0Sarah Baghouil1Estelle Le Baron2Romain Collignon3Filipa Santos4Teresa C. Diamantino5Isabel Catarino6Jorge Facão7Cristina Ferreira8Soraia Páscoa9Florian Sutter10Aránzazu Fernández-García11Johannes Wette12German Aerospace Center (DLR), Institute of Solar Research, Calle Doctor Carracido Nr. 44, 1st Floor, 04005 Almería, Spain; Corresponding author.AGC Glass Europe, Rue Louis Blériot n°12, 6041 Gosselies, BelgiumUniv. Grenoble Alpes, CEA, Liten, Campus Ines, 73375 Le Bourget du Lac, FranceUniv. Grenoble Alpes, CEA, Liten, Campus Ines, 73375 Le Bourget du Lac, FranceLaboratório Nacional de Energia e Geologia, Estrada do Paço do Lumiar, n°22, 1649-038 Lisboa, Portugal; LIBPhys-UNL, Department of Physics, NOVA School of Science and Technology, NOVA University of Lisbon, PortugalLaboratório Nacional de Energia e Geologia, Estrada do Paço do Lumiar, n°22, 1649-038 Lisboa, PortugalLIBPhys-UNL, Department of Physics, NOVA School of Science and Technology, NOVA University of Lisbon, PortugalLaboratório Nacional de Energia e Geologia, Estrada do Paço do Lumiar, n°22, 1649-038 Lisboa, PortugalLaboratório Nacional de Energia e Geologia, Estrada do Paço do Lumiar, n°22, 1649-038 Lisboa, PortugalLaboratório Nacional de Energia e Geologia, Estrada do Paço do Lumiar, n°22, 1649-038 Lisboa, PortugalGerman Aerospace Center (DLR), Institute of Solar Research, Calle Doctor Carracido Nr. 44, 1st Floor, 04005 Almería, SpainCentro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT). Plataforma Solar de Almería (PSA), Ctra. de Senés s/n km 4, Apartado 22, 04200 Tabernas, SpainCentro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT). Plataforma Solar de Almería (PSA), Ctra. de Senés s/n km 4, Apartado 22, 04200 Tabernas, SpainA novel characterization technique based on image analysis is presented, intended to complement state-of-the-art reflectometer measurements. The technique is developed by experts from different laboratories (OPAC, AGC, CEA and LNEG), which subsequently conduct two Round Robin experiments on corroded solar reflectors for validation. Regarding the inter-comparability, it is found that parameters like the corrosion spot density or the penetration maximum on coated edges exhibit an average coefficient of variation of 62.6 % and 54.9 %. Better agreement is found for parameters like the total corroded area and the maximum edge corrosion penetration, with coefficients of variation of 14.3 % and 13.4 %, respectively.The developed methodology is further applied during a 68-month lasting outdoor exposure campaign of two types of solar reflectors at two representative sites, one exhibiting corrosivity class C2 and the other C3. On the commercial coating RL1, a total corroded area of 59 mm² and 426 mm² is measured after the outdoor exposure on the C2 and the C3 site, respectively, while on the novel low-lead coated reflector RL3 corresponding values are 280 mm² and 1308 mm². This shows the superior quality of the coating RL1 in terms of corrosion resistance. Furthermore, the analysis highlights the importance of proper edge sealing for corrosion protection, since corrosion penetration is increased by a factor between 1.3 and 4.0 if the edges are unprotected. The reflectance decrease after the outdoor exposure is regarded as negligible (0.000 - 0.005), thus not permitting any of the conclusions that are made from the novel image analysis technique.http://www.sciencedirect.com/science/article/pii/S2590123024020243Round RobinConcentrating solar powerCorrosionReflector qualificationImage analysis |
| spellingShingle | Florian Wiesinger Sarah Baghouil Estelle Le Baron Romain Collignon Filipa Santos Teresa C. Diamantino Isabel Catarino Jorge Facão Cristina Ferreira Soraia Páscoa Florian Sutter Aránzazu Fernández-García Johannes Wette Detection of corrosion on silvered glass reflectors via image processing Results in Engineering Round Robin Concentrating solar power Corrosion Reflector qualification Image analysis |
| title | Detection of corrosion on silvered glass reflectors via image processing |
| title_full | Detection of corrosion on silvered glass reflectors via image processing |
| title_fullStr | Detection of corrosion on silvered glass reflectors via image processing |
| title_full_unstemmed | Detection of corrosion on silvered glass reflectors via image processing |
| title_short | Detection of corrosion on silvered glass reflectors via image processing |
| title_sort | detection of corrosion on silvered glass reflectors via image processing |
| topic | Round Robin Concentrating solar power Corrosion Reflector qualification Image analysis |
| url | http://www.sciencedirect.com/science/article/pii/S2590123024020243 |
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