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CHAPTER EIGHT
THRU PAINT MEASUREMENT TECHNIQUE
8.1 Introduction to Thru Paint Measurement
The principle behind thru paint measurement is by measuring the time between two
back wall echoes returning from the test material. Since both of these back wall
echoes travel the same path through the paint or coating, the thickness of the coating
is subtracted out of the measurement so that only the actual material thickness can
be measured. This feature saves the user a great deal of time scraping and
removing the coating from materials during the inspection process.
The primary purpose of thru paint measurement is to determine actual or overall
material thickness by eliminating the coating thickness. The
PVX-B
has general
factory setups that have been adjusted according to the transducer type and for
overall optimization. Since the
PVX-B
doesn’t have a scope for fine adjustments,
these setups cannot be altered. For specific applications where the standard factory
setups are not successful, contact Dakota Ultrasonics to send samples to the factory
to create a custom setup. The
PVX-B
can be programmed with custom setups
created with our
PVX
scope.
8.2 Using Thru Paint Mode
The first thing to note in this section is that by selecting the transducer types labeled
I-E
&
E-E
from the factory setups stored in the
PVX-B
, a basic echo-echo thru paint
configuration is recalled from memory. Each of the transducers in the setup list
contain pre-configured
interface-echo (I-E)
and
echo-echo (E-E)
settings. Test the
feasibility of your application. If you’re not having any luck, have samples sent in to
factory for our evaluation.
www.
GlobalTestSupply
.com
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