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Title: Evaluation of Acoustic Tomography for Tree Decay Detection

Source: In: Proceedings of the 15th International Symposium on Nondestructive Testing of Wood, September 10-12, 2007; Duluth, Minnesota, pp. 49-54; 2008

Author(s)Liang, Shanqing; Wang, Xiping; Wiedenbeck, Janice; Cai, Zhiyong; Fu, Feng

Publication Year: 2008  View PDF »

Category: Conference Proceedings

Abstract: In this study, the acoustic tomography technique was used to detect internal decay in high value black cherry (Prunus serotina) trees. Two-dimensional images of the cross sections of the tree samples were constructed using PiCUS Q70 software. The trees were felled following the field test, and a disc from each testing elevation was subsequently cut and evaluated in the laboratory. It was found that acoustic tomography is capable of detecting internal heartwood decay in black cherry trees. Comparison of the acoustic tomograms with photographic images and hardness mappings of the discs revealed that the prediction of decay areas by acoustic tomography is rather conservative when heartwood decay is the major structural defect in trees. When an internal crack is present in the tree trunk, acoustic tomography tends to overestimate the size of defect. This highlights the importance of determining the nature of structural defects when assessing hardwood trees using the acoustic tomography technique.

Keywords: Acoustic tomography, black cherry, decay detection, trees

File size: 605 kb(s)

Date posted: 07/21/2009
Current FPL Scientists associated with this product (listed alphabetically)
Cai, Zhiyong
Supervisory Research Materials Engineer
Wang, Xiping
Research Forest Products Technologist
 

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