Which presentation is primarily used to display time-of-flight information along a line in nondestructive testing?

Which presentation is primarily used to display time-of-flight information along a line in nondestructive testing?

• A. B-scan
• B. A-scan presentation
• C. C-scan
• D. D-scan presentation

Answer: (B)

Time-of-flight information along a single scan line is best shown by the A-scan. This presentation graphs the ultrasonic signal’s amplitude as a function of time of flight, and in UT that time corresponds to depth. As you move the probe along a line, echoes from features along that line appear as spikes at their respective travel times, giving a direct readout of how deep those features are along that line. The B-scan combines many A-scans to create a two-dimensional image of depth versus position, which is not restricted to a single line. C-scan provides a plan view over an area, and D-scan presents time-of-flight data along curves or angles rather than a straight line. So, for displaying time-of-flight along a line, the A-scan is the appropriate presentation.

Time-of-flight information along a single scan line is best shown by the A-scan. This presentation graphs the ultrasonic signal’s amplitude as a function of time of flight, and in UT that time corresponds to depth. As you move the probe along a line, echoes from features along that line appear as spikes at their respective travel times, giving a direct readout of how deep those features are along that line. The B-scan combines many A-scans to create a two-dimensional image of depth versus position, which is not restricted to a single line. C-scan provides a plan view over an area, and D-scan presents time-of-flight data along curves or angles rather than a straight line. So, for displaying time-of-flight along a line, the A-scan is the appropriate presentation.