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Title: Using ground penetrating radar to classify features within structural timbers

Source: In: Wang, X.; Sauter, U.H.; Ross, R.J., eds. 2019. Proceedings: 21st International Nondestructive Testing and Evaluation of Wood Symposium. General Technical Report FPL-GTR-272. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. pp 502-510.

Author(s)Wu, Xi; Senalik, Christopher Adam; Wacker, James ; Wang, Xiping ; Li, Guanghui

Publication Year: 2019  View PDF »

Category: Conference Proceedings

Abstract: Recent developments in image processing play a significant role in identifying and classifying features on ground penetrating radar (GPR) radargrams. Two groups of timber specimens were examined in this study. The first group comprised laboratory prepared Douglas-fir (Pseudotsuga menziesii) timber sections with inserts of known internal characteristics. The second group comprised timber girders salvaged from timber bridges on historic Route 66 that had been exposed to weather for more than 80 years. A subsurface interface radar system with a 2-GHz palm antenna was used to scan these two groups of specimens. GPR sensed differences in dielectric constants along the scan path caused by the presence of water, metal, or air within the wood. This study focused on two procedures: feature identification and classification. Image processing was used to identify the presence of defect features, which was then classified based upon machine learning. GPR radargrams proved to be an excellent tool to detect and define characteristics within structural timbers.

Keywords: Ground penetrating radar; timber; metal; moisture content; image processing; feature classification

Publication Review Process: Informally Refereed (Peer-Reviewed)

File size: 790 kb(s)

Date posted: 12/20/2019
RITS Product ID: 96770
Current FPL Scientists associated with this product (listed alphabetically)
Senalik, Christopher
Research General Engineer
Wacker, James P.
Research General Engineer
Wang, Xiping
Research Forest Products Technologist

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