IMPACT ECHO (IE)
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3. Filter Function: In most of the cases, filtering is required for the IE data. Go to Analysis/Digital
Filter Function or press F4 to set the desired filter. The dialog box below will appear on your
screen. There are four options for digital filtering; Butterworth, Chevbyshev, Elliptic and Inverse
Chevbyshev. Digital filter will be applied to all the data. To disable filtering, simply leave all
the filter options unclicked.
Figure 5.4 - Digital Filter
4. Concrete Velocity: The next important aspect in the IE analysis is the velocity setting. To access
the velocity being used to calculate the thickness, simply click on Analysis/Change Velocity. The
IE velocity of the tested structure should be set correctly in order for the program to calculate the
echo depth of the foundation accurately.
Common filter used for the IE data is Butterworth (Highpass)
Typical concrete velocity is 12,000
Higher strength concrete may have higher velocity. Young concrete (less
than 7 days old) may have slower velocity.
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