What is the main purpose of visualizing S-scans in PAUT?

Visualizing S-scans in Phased Array Ultrasonic Testing (PAUT) primarily serves the purpose of evaluating depth or amplitude variations in the inspected material. The S-scan representation provides a two-dimensional view where the vertical axis typically corresponds to the depth of the material and the horizontal axis represents the position along the scan line. This visualization allows technicians to clearly identify variations in echo amplitude, which can indicate flaws or changes in material properties at different depths.

By assessing these amplitude variations, inspectors can determine the presence of defects such as cracks or inclusions, leading to informed decisions regarding the integrity of the material being inspected. The ability to visualize these details in an S-scan format is critical for effective analysis and ensures that any potential issues are accurately detected and evaluated.

Other options, while potentially related to inspection in different contexts, do not directly reflect the primary purpose of S-scans. For instance, reviewing previous inspection reports or analyzing temperature variations are not functions of S-scans themselves. Similarly, measuring acoustic impedance is a different characterization method that does not utilize the S-scan format for assessment. Thus, the focus of S-scans on depth and amplitude variations is what makes this choice the most accurate and relevant.