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Title:
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Thermography: quality control for module manufacturing
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Author(s):
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Published by:
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Publication date:
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ECN
Energy in the Built Environment
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1-5-2003
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ECN report number:
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Document type:
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ECN-RX--03-026
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Conference Paper
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Number of pages:
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Full text:
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2
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Download PDF
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Presented at: 3rd World Conference on Photovoltaic Energy Conversion, Osaka, Japan, 11-18 mei 2003.
Abstract:
It is beneficial to check the quality of the strings ofcells prior to the final lamination process to avoid the
rejection of a complete laminate in case of a defective
string. Defective cells or defective connections can be
detected in a fairly simple way prior to the lamination
process by thermography. Within a few seconds after
applying a reverse current in the order of the short circuit
current of the cells a clear IR-image can be observed. The
image may be obscured by local variations in the emission
coefficient for IR radiation. This complication however is
successfully tackled by covering the string with a simple
plastic foil. The foil takes over the temperature
distribution of the underlying string and emits the
radiation with a uniform emission coefficient.
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