Appendix C – Glossary
Part # 910-250C
171
Sound Path Distance The distance from the transducer beam index point to
the reflector located in the specimen, measured along
the actual path that the sound travels. Sometimes
referred to as angular distance in angle beam testing.
Straight Beam Probe
(Normal Beam Probe)
A probe which transmits the sound into the material
perpendicular to the entry surface.
Surface Wave Mode of wave propagation characterized by an
elliptical movement of the particles (molecules) on the
surface of the specimen as the wavefront moves
forward, this movement penetrating the specimen to a
depth of one wavelength.
Through Transmission A test method in which the vibrations emitted by one
search unit are directed toward, and received by,
another search unit. The ratio between quantity of
vibration sent and received is a measure of the
integrity, or quality of the material being tested.
Time Varied Gain (TVG) Circuit that automatically adjusts gain so that the echo
amplitude of a given size reflector is displayed at a
constant screen height regardless of the distance to that
given size reflector.
Transducer A device that transforms one form of energy into
another.
Transmitter Circuit of the flaw detector that sends the initial pulse
voltage to both the transducer and receiver.
Ultrasonic Of or relating to frequencies above the human audible
range; e.g., above 20,000 cycles/sec. (Hertz).
Ultrasonics Study of pressure waves which are of the same nature
as sound waves, but which have frequencies above the
human audible limit, i.e., above 20,000 cycles/sec.
(Hertz).
Term Definition
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