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Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592


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Requested Product

Title: Method and Apparatus for In Situ Evaluation of Wooden Members

Source: U.S. Patent 5,396,799. Mar 14, 1995. 11 p. Int. Classif. G01H 1/00.

Author(s)Ross, Robert J.; DeGroot, Rodney C.; Geske, Earl A.; Nelson, William J.; Malinauskas, Vyto C.; Cuevas, Diego O.

Publication Year: 2014  View Document »

Category: Patents

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.

Keywords: wooden member, in situ, acoustic wave, sound speed, attenuation, nondestructive, damage detection

Date posted: 09/22/2014
RITS Product ID: 69282
Current FPL Scientist associated with this product
Ross, Robert J.
Supervisory Research Gen. Engineer

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