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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Soiling in Solar Energy Systems: The Role of the Thresholding Method in Image Analysis
Solar RRL, Year 2023
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Description
The use of image analysis has often been suggested as a practical way to monitor the soiling accumulated on the surfaces of solar energy conversion devices. Indeed, the deposited soiling particles can be counted and characterized to calculate the area they cover, and this area can be converted into an energy loss. However, several particle counting methodologies exist and can lead to dissimilar results. This work focuses on the role of thresholding, an essential step where particles are distinguished from a background based on the pixel brightness. Sixteen automatic thresholding methods are assessed using 13 200 micrographs of glass coupons soiled at nine locations globally. In low-to-intermediate soiling conditions, the “Triangle” method is found to return the minimum coefficient of variation and a mean deviation closer to zero. On the other hand, methods assuming a bimodal distribution of pixel brightness underestimate the area coverage. In addition, since soiling can be unevenly distributed over a surface, different loss estimations can be returned when the same image analysis process is used on different spots on a sample's surface. For these reasons, image analysis should be repeated at multiple locations on each investigated surface. © 2023 The Authors. Solar RRL published by Wiley-VCH GmbH.
Authors & Co-Authors
Micheli, Leonardo
Italy, Rome
Sapienza Università Di Roma
Smestad, Greg P.
United States, San Jose
Sol Ideas Technology Development
Khan, Muhammad Zahid
Germany, Halle
Fraunhofer Center for Silicon Photovoltaics Csp
Germany, Halle
Fraunhofer Institute for Microstructure of Materials and Systems Imws
Germany, Kothen (anhalt)
University for Applied Sciences - Anhalt
Abraim, Mounir
Morocco, Rabat
Institut de Recherche en Energie Solaire et Energies Nouvelles
Anderson, Cody B.
Australia, Brisbane
Queensland University of Technology
Italy, Milan
Politecnico Di Milano
Bentouba, S.
Norway, Stavanger
Norce
Figgis, Benjamin W.
Qatar, Doha
Hamad Bin Khalifa University
Fuke, Pavan
India, Mumbai
Indian Institute of Technology Bombay
Hachicha, Ahmed Amine
United Arab Emirates, Sharjah
University of Sharjah
Karim, Mounia
United Kingdom, Derby
University of Derby
Kottantharayil, Anil
India, Mumbai
Indian Institute of Technology Bombay
Alami Merrouni, Ahmed
Morocco, Oujda
Université Mohammed Premier Oujda
Picotti, Giovanni
Australia, Brisbane
Queensland University of Technology
Wiesinger, Florian
Germany, Koln
Deutsches Zentrum Für Luft- Und Raumfahrt Dlr
Ilse, Klemens K.
Germany, Halle
Fraunhofer Center for Silicon Photovoltaics Csp
Germany, Halle
Fraunhofer Institute for Microstructure of Materials and Systems Imws
Statistics
Authors: 15
Affiliations: 18
Identifiers
Doi:
10.1002/solr.202300654
ISSN:
2367198X
Research Areas
Health System And Policy