Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Xiping WangJan WiedenbeckRobert J. Ross; John W. Forsman; John R. Erickson; Crystal Pilon; Brian K. Brashaw
    Date: 2005
    Source: Gen. Tech. Rep. FPL-GTR-162. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 11 pages
    Publication Series: General Technical Report (GTR)
    Station: Forest Products Laboratory
    PDF: View PDF  (1.3 MB)

    Description

    Decay can cause significant damage to high-value hardwood timber. New nondestructive evaluation (NDE) technologies are urgently needed to effectively detect incipient decay in hardwood timber at the earliest possible stage. Currently, the primary means of inspecting timber relies on visual assessment criteria. When visual inspections are used exclusively, they provide no indication of the extent of internal deterioration that may exist in timber. In this study, time-of-flight, stress-wave tomography, and micro-drilling resistance methods were investigated for locating incipient decay in sugar maple logs. We found that the capability of the single-path time-of-flight method for decay detection is very limited, and the method can be used only to identify logs and trees with moderate and severe decay. Resistance-based detection of decay (including early stages) is effective if the resistance drilling device is oriented so that its path goes through the decay zone; however, orienting the drill through the decay is difficult to guarantee. A multi- sensor stress-wave device can overcome the path-dependent detection issue. Results from laboratory testing indicate that the eight-sensor two dimensional stress-wave device has good potential for assisting in the detection of incipient decay in roundwood, such as logs and standing timber. However, to more effectively locate early-stage decay within a hardwood timber, more sensors should be added to the measurement system to obtain a higher resolution two-dimensional tomography image of a cross section. Field studies on standing hardwood timber should further investigate the effectiveness of these NDE methods with improved systems and procedures. This research could benefit field foresters and managers in using NDE technologies to assess the health condition of hardwood timber in the forest and could potentially lead to significant economic savings.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Wang, Xiping; Wiedenbeck, Jan; Ross, Robert J.; Forsman, John W.; Erickson, John R.; Pilon, Crystal; Brashaw, Brian K. 2005. Nondestructive evaluation of incipient decay in hardwood logs. Gen. Tech. Rep. FPL-GTR-162. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 11 pages

    Cited

    Google Scholar

    Keywords

    hardwood log, incipient decay, micro-drilling resistance, resistograph, stress wave, tomograph

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/21672