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Nondestructive methods for detecting defects in softwood logs / Kristin C. Schad, Daniel L. Schmoldt, Robert J. Ross.
- Format:
- Book
- Government document
- Author/Creator:
- Schad, Kristin C., author.
- Schmoldt, Daniel L. (Daniel Lee), 1953- author.
- Ross, Robert J. (Robert Jon), author.
- Series:
- Research paper FPL-RP ; 546.
- Research paper FPL-RP ; 546
- Language:
- English
- Subjects (All):
- Nondestructive testing.
- Wood--Defects.
- Wood.
- Wood--Quality.
- Wood--Testing.
- nondestructive testing.
- Physical Description:
- 1 online resource (13 pages) : illustrations.
- Other Title:
- Detecting defects in softwood logs
- Place of Publication:
- Madison, WI : United States Department of Agriculture, Forest Service, Forest Products Laboratory, 1996.
- Summary:
- Wood degradation and defects, such as voids and knots, affect the quality and processing time of lumber. The ability to detect internal defects in the log can save mills time and processing costs. In this study, we investigated three nondestructive evaluation techniques for detecting internal wood defects. Sound wave transmission, x-ray computed tomography, and impulse radar were used to examine white spruce and balsam fir logs. Computed tomography resulted in the highest resolution for voids, knots, and high moisture content areas, but at a very high price. Both sound wave transmission and impulse radar were able to detect large voids and areas of degradation, and these techniques showed some sensitivity to very knotty logs. None of the methods was able to detect small pockets of decay. The use of radar requires an experienced operator because of the difficulty of interpreting the data.
- Notes:
- "February 1996"--Page 2 of cover.
- Includes bibliographical references (page 13).
- Electronic reproduction. [S.l.] : HathiTrust Digital Library, 2010.
- Description based on online resource, PDF version; title from cover (USFS, viewed July 12, 2019).
- Other Format:
- Print version: Schad, Kristin C. Nondestructive methods for detecting defects in softwood logs
- OCLC:
- 679959798
- Access Restriction:
- Use copy Restrictions unspecified
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