A cross sectional B-scan provides a detailed end view of a test piece along a single axis. This provides more information than the single value B-scan presented earlier. Instead of plotting just a single measured value from within a gated region, the whole A-scan waveform is digitized at each transducer location. Successive A-scans are plotted over elapsed time or actual encoded transducer position so as to draw pure cross-sections of the scanned line. This allows visualization of both near and
far surface reflectors within the sample. With this technique, the full waveform data is often stored at each location and may be recalled from the image for further evaluation or verification.
To accomplish this, each digitized point of the wave form is plotted so that color representing signal amplitude appears at the proper depth.
Succesive Ascans are digitized, related to color and "stacked" at user defined intervals (elapsed time or position) to form a true few cross-sectional image.
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Phased Array Linear Sectorial Scan (S-scan) >>