20 March 1985 Evaluation Of Photovoltaic Panels With Ir Thermography
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Abstract
Electronic infrared thermography allows fast and non-destructive measurements of temperature distributions of encapsulated solar cells on a panel under various operating conditions. Differences in the performance of the individual cells can be visualized and so called "hot spots" in the panel (due to partial shadowing, etc.) can be analyzed. IR image analysis was also used to determine the IR emissivity of different types of solar cells. This is one of the important criteria for the evaluation of the electrical-thermal behaviour of a cell for photo-voltaic or combined photovoltaic thermal applications. We designed a portable IR measuring system having both on-line and off-line interfacing possibilities with a minicomputer for image processing and analysis. During field measurements, the composite video signal of the IRT system is recorded on a video cassette. For analysis, the thermal images can be visualized on a TV moni-tor and, at the same time, they are digitized and transferred onto a PDP-11 computer for processing. A suit-able software package was developed to obtain different types of thermograms such as simple line profiles, 3-dimensional relief images and isothermal maps.
© (1985) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
R. Tscharner, K. H . S . Rao, R. Schwarz, A. V. Shah, "Evaluation Of Photovoltaic Panels With Ir Thermography", Proc. SPIE 0520, Thermosense VII: Thermal Infrared Sensing for Diagnostics and Control, (20 March 1985); doi: 10.1117/12.946143; https://doi.org/10.1117/12.946143
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