The areas of highest bond integrity are shown towards the top of the color scale, the lowest, towards the bottom of the scale. The arrows in Figure 3 indicate regions with little or no bonding. This inspection is accomplished from the inside surface using a single transducer operating in the pulse echo mode. Also, fiber impact damage in composite tile has been detected using the dry coupled transducer. Frequencies used on the work to date have been in the 0.5 to 5.0 MHz range.
Efforts are underway to characterize the couplant material at higher frequencies.
As more data become available they will be posted to this page.