DMTA-10055-01EN, Rev. A, February 2015
Glossary
327
Rectification Receiver function that selects display of waveforms as an
RF signal with both positive and negative deflections, a
full wave rectified signal in which all deflections are
displayed as positive, or half wave negative and positive
in which only one side of the RF signal is displayed as a
positive deflection.
Reference echo The echo from a specified reference reflector.
Reference gain
(reference level)
A gain level established by a test procedure, commonly by
setting a reference reflector echo to a specified height.
Reference line A designated percentage of total screen height at which
reference echoes and indication echoes are compared.
Reference reflector A reflector of known size and geometry at a known
distance, such as a flat bottom hole.
Refraction, angle of The angle with respect to perpendicular of the sound
beam in the test material, generated by refraction from the
angle of incidence in the wedge.
Reject (control) Also known as suppression, this limits the input
sensitivity of the amplifier in the receiver to display only
indications greater than a selected height. It is used to
reduce or eliminate “grass” or scattering noise from the
display.
Resolution The ability of the test system (instrument and transducer)
to distinguish between two reflectors at slightly different
depths, or within a given distance of the surface of the test
piece.
Scanning gain The amount of gain above the reference level added per
procedure to optimize visibility of indications.
Second critical angle In angle beam or immersion testing, the minimum
incident angle in the wedge or water path at which the
refracted shear wave disappears from the test piece.
Table 32 Glossary (continued)
Term Definition
To Next Page
Loading...
