910-269-EN, Rev. B, June 2011
Glossary 323
Appendix B: Glossary
Table 37 Glossary
Term Definition
Acoustic impedance A material property defined as the product of sound
velocity (C) and the material’s density (d).
Acoustic interface The boundary between two media of different acoustic
impedance.
Acoustic zero The point on the data display that represents the entry
surface of the specimen.
Amplifier An electronic device that increases the strength of a signal
fed into it by obtaining power from a source other than the
input signal.
Amplitude Referring to an indication on the data display, the vertical
height of an indication measured from the lowest to the
highest point on the indication.
Angle beam
transducer
A transducer that transmits or receives the acoustic energy
at an angle to the surface to set up shear waves or surface
waves in the part being inspected.
A-scan Pulse-echo format wherein the data display shows the
pulse travel time in the horizontal direction (left to right)
representing the corresponding sound paths. The vertical
direction (bottom to top) displays the maximum value of
the acoustic pressure echo amplitude received by the
probe.
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