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): Shan Gao; Xiping Wang; Lihai Wang; R. Bruce Allison
    Date: 2012
    Source: Wood and Fiber Science
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    PDF: View PDF  (708.35 KB)

    Description

    The goals of this study were to investigate the effect of environment temperature on acoustic velocity of standing trees and green logs and to develop workable models for compensating temperature differences as acoustic measurements are performed in different climates and seasons. The objective of Part 1 was to investigate interactive effects of temperature and moisture state of wood on acoustic properties in a laboratory-controlled environment. Small clear specimens (25.4 x 25.4 x 407 mm) obtained from a freshly cut red pine (Pinus resinosa) log were conditioned to four moisture content levels: green (fresh-cut condition), 24%, 12%, and 0%. All specimens were acoustically tested using an ultrasonic device across a temperature range of -40 to 35°C. Results indicate that wood temperature had a significant effect on acoustic velocity in frozen wood. Below the freezing point, acoustic velocity increased as wood temperature decreased.When wood temperature was well above freezing, velocity decreased linearly at a slow rate as wood temperature increased.We found that wood moisture content had a significant compounding effect on velocity–temperature relationships in the freezing zone (-2.5 to 2.5°C). Temperature effect was much more significant in green wood than in dry wood. In green wood, both velocity and peak energy changed abruptly around the freezing point because of the phase transformation of free water in the cell lumens.

    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

    Gao, Shan; Wang, Xiping; Wang, Lihai; Allison, R. Bruce. 2012. Effect of Temperature on Acoustic Evaluation of Standing trees and logs: Part 1-Laboratory investigation. Wood and Fiber Science, Volume 44, Number 3, 2012, pp. 286-297; 2012.

    Keywords

    Acoustic velocity, peak energy, logs, moisture content, temperature, trees

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/41370