Z-Scan ScreenThis is the main display screen for 3D ultrasonic datasets (Z-scans). It allows the interactive analysis of B-scans and C-scans from these 3D blocks of data. Cross-hairs in the "Broad C-scan" image (upper center), control the display of a live A-scan (lower right) and also allow the B-scans in the X and Y directions at the cross-hairs to be shown (upper right and lower center). By defining a time gate (yellow region of A-scan), a corresponding broad C-scan can be formed (upper center), and a series of C-scan segments within this gate can be obtained (upper left). These finely time-gated C-scan segments can be stepped through using a slider to determine the profile of a feature with depth. The Z-scan screen also provides entries to numerous other visualization and signal and image processing functions. The dataset used in these images was obtained from inspection of a specimen of a steplap joint of an aircraft. This structure consists of a stepped titanium core within a graphite-epoxy matrix. Two simulated rectangular defects were introduced into the specimen during makeup and can be clearly seen in the C-scan images. The stepped character of the specimen is also apparent in the B-scan (Y) image.
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