T.O. 33B-1-15-4Figure 5-4. Ultrasonic Reflection.5.1.3.3 DataPresentationMethods.There are three methods of data presentation used for ultrasonic inspection: A-scan, B-scan and C-scan. “A-Scan” isthe method of data presentation in the form of a horizontal baseline that indicates distance/time and that deflectsvertically to indicate amplitude of electrical signals corresponding to ultrasonic pulses and echoes. The upper half ofFigure 5-5 represents an A-scan display corresponding to the contact inspection shown in the lower half of the figure.A-scan presentations are the most popular presentation, and are commonly referred to as distance-amplitudepresentations.Figure 5-5. Typical A-Scan Display for Contact Inspection.
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