Reconstruction and Calibration of Contactless Electroluminescence Images From Laser Line Scanning of Photovoltaic Modules

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Abstract

This article presents image processing methods for reconstructing and calibrating contactless electroluminescence (EL) images acquired with laser line scanning for diagnostic of photovoltaic modules. The method specifically focuses on two outputs: a contactless conventional EL that is calibrated to correspond to electrically biased EL and a contactless highlighted EL that emphasizes visualization of defects. Results are evaluated first by visual inspection, showing similar resolution to electrically biased EL at 2% or 5% Isc. A quantitative analysis by peak signal to noise ratio (PSNR) measures also assesses the resemblance between the reconstructed contactless conventional EL and the reference electrically biased EL.
Original languageEnglish
Article number9736329
JournalIEEE Journal of Photovoltaics
Volume12
Issue number3
Pages (from-to)696 - 702
ISSN2156-3403
DOIs
Publication statusPublished - 2022

Keywords

  • Contactless EL (CEL)
  • Diagnostic
  • Electroluminescence (EL)
  • Imaging
  • Laser induced luminescence

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