Signification and Use of A-scan Images
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QuintSonic 7
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correlating, it can be assumed that measurement ha
s been correct. That’s why the verification of
readings by means of the A-scan image should become a routine in ultrasonic measurement.
7.2 Description of A-scan Image Types
QuintSonic 7 provides the following types of A-scan images:
reference signal
raw measuring signal
echo signal with echo lines
The different A-scan images result from the different stages of the measuring and evaluation
process. Their information content and use is also different and will be described in the following
section.
All A-scan images are scaled in time units (nanoseconds). As the sound velocities vary according
to the individual layers, it is not possible and would make no sense to scale in thickness units.
7.2.1
Reference signal
Example of an A-scan image with reference signal
The above figure is a typical example of an A-scan image that should be generated and stored in
the background if a reference signal has been taken (see section 6.4.1). It exactly reflects the
representation of the reference signal received by the ultrasonic sensor head.
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A
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