For example, Figure 1 demonstrates an 8 NPS and schedule 40 stainless steel pipe that was tested.
Figure 2 shows data acquired with both MsS encircling and sector probes. The defect is detected
at approximately 4.1 m. with two encircling probes installed at either end of the pipe.
4-inch MsS sector probe is used to verify the detected defect by rotating 360˚ along the circumference.
The discrete defects are detected at approximately 10 cm behind the weld. This example demonstrates
the importance of spatial resolution in guided wave testing.