Banner for LabNotes
From Lab Notes
Contact Information
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592
Email

 

You are here: FPL Home  / Information Products & Services  / Publications

Requested Product

Title: Ultrasonic inspection and analysis techniques in green and dried lumber

Source: Proceedings of the Eleventh International Symposium on Nondestructive Testing of Wood : September 9-11, 1998, Madison, Wisconsin. Madison, WI : USDA Forest Products Laboratory, 1999: pages 95-102.

Author(s)Schafer, Mark E.; Ross, Robert J.; Brashaw, Brian K.; Adams, Roy D.

Publication Year: 1999  View PDF »

Category: Journal Articles

Abstract: Ultrasonic inspection of lumber has been under investigation for over 20 years, with little commercial impact. Recently, the USDA Forest Products Laboratory (FPL) developed ultrasound-based scanning technology to examine both green and dried lumber. In green lumber, the bacterial infection called wetwood (a significant source of degradation in oak at the kiln-drying stage) was found with high accuracy using time-of-flight techniques. A similar approach was used to locate checking and honeycombing in dried lumber, defects that are often not apparent by external visual inspection. This technology has been licensed and is now being developed for commercial use by the Perceptron Inc., Ultrasound Technology Group, whose specialty is ultrasonic systems and signal processing. The current phase of the project involves a flexible testbed system that can: accommodate a wide range of lumber specimens; permit automated ultrasonic inspection; and account for the specimen's width and thickness. The inspection provides complete sampling of the ultrasound waveform, so several different signal-processing strategies may be examined beyond the time-of-flight approach commonly used. Special display software allows the user to plot several analysis parameters as a function of position along the length of the specimen. A set of novel signal criteria indicative of different conditions within the wood specimens has been developed. This paper describes the design of the system and its unique features, the unique analysis approach, and results obtained to date.

Keywords: Lumber, inspection, ultrasonics, wood defects, biodegradation, decayed wood, grading, techniques, wood technology, wetwood, ultrasonic devices, equipment, attenuation, sounds, commercialization, green lumber, dried lumber, sound speed

File size: 197 kb(s)

This publication is also viewable on Treesearch:  view
RITS Product ID: 3391
Current FPL Scientist associated with this product
Ross, Robert J.
Supervisory Research Gen. Engineer
  

Additional items that might interest you
View the video celebrating FPL's 100 years of public service in 2010, from the producers of the Greatest Good....view

Research Highlights from FPL....view

Termite Eradication: A search for the Holy Grail.... view

Moisture Management in Residential Construction Series videos...view

Wood Floor Systems in Residential Construction Series videos....view
- FPL's Mission and Strategic Plan -

FPL's mission is to identify and conduct innovative wood and fiber utilization research that contributes to conservation and productivity of the forest resource, thereby sustaining forests, the economy, and quality of life. ... ..more »

- FPL Research Emphasis Areas -
Advanced Composites

As an integral part of the FPL mission, we improve the long-term sustainability of our Nation's forests by creating valuable composite products from biobased materials ... ..more »


Advanced Structures

The FPL has been in the forefront of wood-frame housing research since 1910 and has long been recognized as a world leader in such housing-related areas as engineered wood ... ..more »


Forest Biorefinery

We all know the compelling reasons that the United States needs to reduce its dependence on fossil fuels. Historically, the greatest increases in energy demand have been for transportation fuels ... ..more »


Nanotechnology

A leader in wood products research for over a century, the FPL is positioning itself to become the lead Federal research facility for the application of nanotechnology in forest products ... more »


Woody Biomass Utilization

Forests in the United States contain a substantial amount of small-diameter, overstocked, and underutilized material.FPL research projects are exploring the potential of the small-diameter ... ..more »