DMTA-10004-01EN, Rev. D, November 2016
Custom Setups for Single Element Transducers
237
The initial gain parameter often helps reduce the interface echo amplitude and
permits the use of a shorter interface blank. Check the interface blank settings with
the transducer both coupled to and uncoupled from the test material.
Figure 13‑14 Examples of the interface blank in mode 2
In mode 3, the interface blank selects which pair of back-wall echoes are measured
(see Figure 13-15 on page 238). In most conditions, the interface blank would be set
just short of the first back-wall echo. However, as a practical matter, the first back-wall
echo from thin materials is often distorted or lost in the interface echo. With some
challenging geometries (such as tight radii), later pairs of back-wall echoes may be
cleaner than early ones. In these cases, set the interface blank to a length that ensures
detection of a clean and well-defined pair of back-wall echoes, even if echoes are not
the first two.
Gage reading trailing edge of the interface
echo
Interface blank set correctly
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