G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 31/304 (2006.01) G01R 31/309 (2006.01) H01L 21/66 (2006.01) G01R 31/28 (2006.01)
Patent
CA 2363171
A Printed Circuit Board (PCB), bare or populated with electronic components, may present some short-circuits occurring during the manufacturing or the assembly process. By taking different images of the entire PCB with a Visible-NIR camera at specific times, before and after the short- circuit current is applied, and by processing them, it is possible to find the exact location of the short-circuit fault on the PCB. The Visible-NIR Focal Plan Array (FPA) of the camera, which is sensitive in the NIR band, is able to sense and to detect an extra signal due to the heat radiation of the short-circuit area. Once this extra signal has been detected for some identified pixels, these pixels are reported to the Visible image to pin point the exact location of the short-circuit fault. The fault can be corrected by the usual repair methods.
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