DMTA-10055-01EN, Rev. A, February 2015
Appendix C
328
Sensitivity
The ability of the test system (instrument and transducer)
to detect a given size reflector at a given distance.
Signal-to-noise ratio
The amplitude ratio between the echo from a given
indication and background indications such as grain
scattering or instrument noise.
Single element probe
A transducer containing only one piezoelectric element,
which is used to both transmit and receive sound.
Skip-distance
In angle beam testing, the surface distance which
represents one V-path of sound in the material.
Sound beam
The characteristic shape of the ultrasonic wave in a test
piece.
Sound path distance
The distance between the transducer and a reflector. In
angle beam and immersion testing, this is commonly
measured from the point at which sound enters the test
piece. This is sometimes referred to as angular distance in
angle beam testing.
Straight beam probe
(Normal beam probe)
A transducer that transmits sound into the test piece
perpendicular to the entry surface.
Surface wave
A mode of wave propagation characterized by an elliptical
movement of the particles on the surface of the specimen
as the wave front moves forward, penetrating the
specimen to a depth of one wavelength.
Through
transmission
A test method in which the pulses from a transmitting
transducer are received by a second transducer on the
opposite side of the test piece.
Time-corrected gain
(TCG)
A software function that adjusts instrument gain so
that the echo amplitude of a given size reflector is
displayed at a constant display height regardless of
the distance to that given size reflector
.
Transducer
A device that transforms one form of energy into another.
Table 32 Glossary
(continued)
Term
Definition
Содержание EPOCH 650
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