Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (955 KB bytes)

Title: Internal log scanning: Research to reality

Author: Schmoldt, Daniel L.;

Date: 2000

Source: Proceedings of the Twenty-eighth Annual Hardwood Symposium

Publication Series: Miscellaneous Publication

Description: Improved log breakdown into lumber has been an active research topic since the 1960's. Demonstrated economic gains have driven the search for a cost-effective method to scan logs internally, from which it is assumed one can chose a better breakdown strategy. X-ray computed tomography (CT) has been widely accepted as the most promising internal imaging technique. Six design and operational constraints needed to be satisfied, however, for industrial CT of logs to become a viable reality. These are aperture size and reconstruction circle, scanning speed, scanner duty cycle, harsh industrial environments, radiation safety, and effective application sofiware. Current airport security scanners have achieved those goals and have bridged the gap between medical CT applications and industrial CT. The log scanning application has numerous similarities with the explosive detection application, which points to a relatively straightforward transition. A recent mill test of CT log scanning validates the value gains that can be realized. In some cases, those gains may become more pronounced in later processing stages. However, upstream sorting and product allocation can also lead to better resource use and an improved bottom line.

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.
  • You may send email to to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)



Schmoldt, Daniel L. 2000. Internal log scanning: Research to reality. Proceedings of the Twenty-eighth Annual Hardwood Symposium


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.