Delaminations and Cracks

Pictured

Time Domain Imaging (TDI)™
Utilizes an echo (amplitude & polarity) arrival ‘time’ as a reference, such as standard A-Scan, B-Scan and C-Mode type images.

Delaminations and Cracks

Solar Panel Delaminations and Cracks - Application Note 900

Delaminations and Cracks

Sample & Method

In the image the echoes from the ultrasonic transducer were gated on the interface between the silicon stack and the silicone adhesive layer on a large solar panel.

Result

The strongest signals were reflected by the white areas associated with the burn out crack and bounded by the cell partitions. These areas are delaminations either within the stack of the cell or between the cell and the silicone layer behind it. The large black lines running from the top of the image to the bottom are cracks in the glass facing sheet caused by a burn out.