T.O. 33B-1-1
5-4
Figure 5-4. Ultrasonic Reflection.
5.1.3.3
Data Presentation Methods.
There are three methods of data presentation used for ultrasonic inspection: A-scan, B-scan and C-scan. “A-Scan” is
the method of data presentation in the form of a horizontal baseline that indicates distance/time and that deflects
vertically to indicate amplitude of electrical signals corresponding to ultrasonic pulses and echoes. The upper half of
Figure 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-amplitude
presentations.
Figure 5-5. Typical A-Scan Display for Contact Inspection.
