DMTA-10084-01EN, Rev. 2, November 2018
Chapter 11
204
Figure 11-43 Echo-to-echo measurement
Shear wave errors in echo-to-echo mode
During a corrosion module inspection in echo-to-echo mode using a dual transducer,
an unwanted shear wave often occurs because of the dual transducer roof angle. Shear
wave velocity is slower than that of a longitudinal wave, so the shear component is
displayed after the first back wall echo. If the shear component crosses the
measurement threshold it can trigger a false measurement from the gate 2 region,
causing a measurement error (see Figure 11-44 on page 205).. You can eliminate a
shear wave error by adjusting the start position of the second back wall measurement.
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