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  1. Using ground penetrating radar to classify features within structural timbers

    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...

    Author(s):
    Xi Wu; Christopher Adam Senalik; James Wacker; Xiping Wang; Guanghui Li
    Year:
    2019
    Keywords:
    Ground penetrating radar, timber, metal, moisture content, image processing, feature classification
    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.

  2. Identifying incipient decay in Douglas-fir bridge components using x-ray computerized tomography

    In this report, wooden members of sizes typically used in bridge construction are examined using x-ray computerized tomography (CT) to determine the presence of internal decay. This report is part of an overall study in which Douglas-fir (Pseudotsuga menziesii) glue-laminated (glulam) beams and solid sawn timbers were inoculated with brown rot fungus, Fomitopsis...

    Author(s):
    Christopher Adam Senalik; James Wacker; Xiping Wang; Xi Wu
    Year:
    2019
    Keywords:
    X-ray computerized tomography, wood timber, brown rot fungus, incipient decay
    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: 62-70.

  3. Assessing the within-tree variation in stiffness from ultrasonic velocity and specific gravity measurements in Douglas-fir and loblolly pine

    Roundwood is increasingly sourced from highly productive plantations that yield excellent growth. Information is needed on the wood properties from plantations because these trees will contain a higher proportion of low stiffness corewood compared to naturally regenerated trees of the same size. The objective of this study was to examine the within-tree...

    Author(s):
    Joseph Dahlen; David Auty; Thomas L. Eberhardt; Eric Turnblom; Eini Lowell; Laurence Schimleck; Cristian Montes
    Year:
    2019
    Keywords:
    acoustic velocity, nondestructive testing, Pinus taeda, Pseudotsuga menziesii, wood and fiber quality
    Source:
    Gen. Tech. Rep. FPL-GTR-272. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory: 122-131.
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https://www.fs.usda.gov/treesearch/search?keywords=%22International%20Nondestructive%20Testing%20and%20Evaluation%20of%20Wood%20Symposium%22&f%5B0%5D=year%3A%222019%22&f%5B1%5D=author_facet%3A%22Thomas%2C%20Ed%22&f%5B2%5D=author_facet%3A%22Eberhardt%2C%20Thomas%22&f%5B3%5D=author_facet%3A%22Wacker%2C%20James%22