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Thermography: quality control for module manufacturing
Gepubliceerd door: Publicatie datum:
ECN Energie in de Gebouwde Omgeving en Netten 1-5-2003
ECN publicatienummer: Publicatie type:
ECN-RX--03-026 Conferentiebijdrage
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Gepresenteerd op: 3rd World Conference on Photovoltaic Energy Conversion, Osaka, Japan, 11-18 mei 2003.

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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