DFX-7
Ultrasonic Flaw Detector
93
at point
(C)
in the incorrect diagram, to point
(B)
in the correct diagram. If we adjust
the
GATE2
hold-off further to the right of the first reflection, the ring down noise from
the first back wall echo no longer interferes with the true detection
(D)
, shown in the
correct diagram.
The adjustment considerations in the example above will typically be used for all thru
paint applications respectively. In some applications the hold-off may be sufficient,
while a
gain(AGC)
or
thresholds
adjustment will solve the problem. A similar
process of elimination should be considered for all thru paint applications.
