Abstract
The paper explains why the echo-signal amplitude sometimes increases instead of decreasing when the surface is palpated.
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REFERENCES
Brekhovskikh, L.M., Volny v sloistykh sredakh (Waves in Layered Media), Moscow: Nauka, 1973.
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Danilov, V.N., Ermolov, I.N. Why Does It Grow?. Russian Journal of Nondestructive Testing 37, 831–834 (2001). https://doi.org/10.1023/A:1015859606642
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DOI: https://doi.org/10.1023/A:1015859606642