High Throughput Detection of Cracks and Other Faults in Solar PV Modules Using a High-Power Ultraviolet Fluorescence Imaging System

Ultraviolet Fluorescence (UVF) is an emerging PV module inspection technique capable of detecting cracks and other faults. To make UVF more practical, a new, high throughput (1000-2000 modules/hour) system utilizing a high-power UV source was developed. The system was demonstrated at 11 sites, consisting of more than 20 module models (aged 1-20+ year(s) old) from at least 8 manufacturers. UVF was observed at all sites, and cracks were detected at all but one. A demonstration of UVF's ability for crack age differentiation is also discussed, which could have applications for insurance and warranty claims. Additionally, an automatic crack-detection utility was developed for one site, achieving an accuracy of 91.7%.