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.


Solar Cell to Metal Buss Bar Delaminations - Application Note 901


Sample & Method

In the image the echoes from the ultrasonic transducer were gated on the interface between the silicon stack and the metallic buss bar on a large solar panel.


The strongest signals were reflected by the white strip at the left. This area is a delamination between the silicon stack and the metal buss bar. The darker grey area at the top of this strip is representative of a good bond between the glass and the buss bar.