Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1992-07-13
1995-03-14
Chilcot, Jr., Richard E.
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
73598, 73600, G01H 100, G01N 2904
Patent
active
053967992
ABSTRACT:
A method for the non-destructive evaluation of the integrity of wooden members, in situ, for example, embedded in the soil, employing the reflection of an acoustic wave off of the embedded end of the wooden member. The reflection is caused by the discontinuity in acoustic properties between wood and the supporting medium. The method allows the measurement, at one end of the member, of substantially the entire length of the wooden member without its removal. The acoustic wave is monitored in time and amplitude to provide indications of sound speed and attenuation, measurements which apparently are not unduly affected by coupling losses between the wooden member and its supporting matrix. These measured values may be empirically linked in an equation providing the integrity of the wooden member.
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Cuevas Diego O.
De Groot Rodney C.
Geske Earl A.
Malinauskas Vyto C.
Nelson William J.
Chilcot Jr. Richard E.
Fado John D.
Oen William L.
Silverstein M. Howard
Stockhausen Janet I.
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