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11. Interpreting the A-Scan Display in Single
Echo Mode
The A-Scan display shows the actual ultrasound echo pulses as
seen by the gauge, these echo pulses are used by the gauge to
determine the thickness measurement if possible.
In Single Echo mode the gauge works by generating a short pulse
of ultrasound that is coupled into the object you are measuring.
This pulse then travels through the object and is reflected back to
the probe as an echo by either the back-wall of the object and/or
any internal flaws or corrosion pits. When the echo pulse hits the
probe surface a signal is received by the DIVE gauge, this signal is
shown on the A-scan display as an echo peak.
The A-Scan display is very useful when measuring in Single Echo
mode, as there is no Verification of the thickness measurement in
Single Echo mode observing the A-Scan display will help the user
verify the echo detected is the correct one – the back-wall echo.
signal.
There is a well-defined back-wall echo and
the arrow is correctly placed at the start.
The measurement value of 14.6 is stable
when yellow in colour.
signal.
There is no clear correct back-wall echo.
Although a measurement of 19.7 has been
displayed its not stable and should not be
relied on. The measurement value is red in
colour when unstable.
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