Which UT data representations provide echo amplitude and depth information used to size planar flaws?

Which UT data representations provide echo amplitude and depth information used to size planar flaws?

• A. A-scan or B-scan.
• B. C-scan and D-scan.
• C. Only phase plots.
• D. Only real-time video.

Answer: (A)

Sizing planar flaws relies on displays that show both how strong the echo is and exactly how deep it comes from. The A-scan plots echo amplitude against time, and since time-of-flight translates to depth with the material’s sound speed, you directly read how deep a reflector is and how large the echo is. The B-scan takes many A-scans along a scan line and forms a two-dimensional image with depth on one axis and lateral position on the other, while using echo strength to shade the image. This combination gives you a clear sense of the flaw’s depth and its spatial extent, which is essential for sizing planar flaws. C-scan, by contrast, provides a plan view at a fixed depth, so you don’t get a direct readout of how deep the reflector is. D-scan focuses on depth versus time along a single line and doesn’t deliver the full two-dimensional area view you’d use for sizing across a surface. Real-time video emphasizes moving visuals rather than precise amplitude-depth mapping, and phase plots convey phase information rather than depth and amplitude needed for sizing. Hence, the displays that best provide both echo amplitude and depth for sizing planar flaws are the A-scan and the B-scan.

Sizing planar flaws relies on displays that show both how strong the echo is and exactly how deep it comes from. The A-scan plots echo amplitude against time, and since time-of-flight translates to depth with the material’s sound speed, you directly read how deep a reflector is and how large the echo is. The B-scan takes many A-scans along a scan line and forms a two-dimensional image with depth on one axis and lateral position on the other, while using echo strength to shade the image. This combination gives you a clear sense of the flaw’s depth and its spatial extent, which is essential for sizing planar flaws.

C-scan, by contrast, provides a plan view at a fixed depth, so you don’t get a direct readout of how deep the reflector is. D-scan focuses on depth versus time along a single line and doesn’t deliver the full two-dimensional area view you’d use for sizing across a surface. Real-time video emphasizes moving visuals rather than precise amplitude-depth mapping, and phase plots convey phase information rather than depth and amplitude needed for sizing. Hence, the displays that best provide both echo amplitude and depth for sizing planar flaws are the A-scan and the B-scan.