Figure 13-14 Examples Of The Interface Blank In Mode 2 - Olympus 38DL PLUS User Manual

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.
Gage reading trailing edge of the interface
echo
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.
DMTA-10004-01EN, Rev. D, November 2016
Custom Setups for Single Element Transducers
Interface blank set correctly
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