What is a typical characteristic of A-scan data?

What is a typical characteristic of A-scan data?

• A. A-scan provides a depth-resolved representation by time-of-flight and amplitude to size features.
• B. A-scan provides a plan view of reflectivity.
• C. A-scan provides a 2D cross-section image.
• D. A-scan provides color mapping of material properties.

Answer: (A)

A-scan data is a depth-resolved, time-domain trace along a single probe path. It shows how the echo amplitude varies with time, and each peak corresponds to a boundary that reflects the ultrasound. By converting the travel time (time of flight) to depth using the material’s sound velocity, you get a depth axis. The height of each peak indicates the strength of the reflection, which is related to the impedance contrast at that boundary and can give an idea of feature size or severity when calibrated. This is what makes A-scan the typical representation: a one-dimensional, time-to-depth, amplitude-versus-time trace. The other descriptions refer to plan views, 2D images, or color maps, which are not what A-scan provides.

A-scan data is a depth-resolved, time-domain trace along a single probe path. It shows how the echo amplitude varies with time, and each peak corresponds to a boundary that reflects the ultrasound. By converting the travel time (time of flight) to depth using the material’s sound velocity, you get a depth axis. The height of each peak indicates the strength of the reflection, which is related to the impedance contrast at that boundary and can give an idea of feature size or severity when calibrated. This is what makes A-scan the typical representation: a one-dimensional, time-to-depth, amplitude-versus-time trace. The other descriptions refer to plan views, 2D images, or color maps, which are not what A-scan provides.