Direct Assessment & Guided Wave Testing
Direct Assessment & Guided Wave Testing
Direct Assessment & Guided Wave Testing
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Amp (mV)<br />
0.6<br />
0.4<br />
0.2<br />
Amplitude decays over distance<br />
• The reflected amplitude from distant features will be smaller than for<br />
close features<br />
• The range is limited<br />
• Two things that cause signal decay<br />
– Reflection from features<br />
– Attenuation from coating, soil, generalized corrosion, etc<br />
-F1 -F2 -F3 -F4 -F5<br />
0.0<br />
0.0 5.0 10.0 15.0 20.0<br />
Distance (m)<br />
SLIDE 46
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