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- Title
Separate-sided surface height measurement using a handheld profiling device.
- Authors
Vadeboncoeur, Natalie; Schajer, Gary; Johnson, Alex; Rickard, David
- Abstract
A novel and practical method for enhanced lumber dimension quality control in a sawmill is presented. The method involves the use of a handheld device that can be run along the length of a board while taking height measurements of both sides. The device uses a multisensor arrangement that is capable of identifying true surface height profiles independent of relative motions between the wood and the sensors. This eliminates the necessity of a straight edge guide for the handheld device as it traverses the board. A mathematical technique based on linear inverse theory is used to extract the true surface height profile by separating the rigid-body motion effects from the raw height data. The evaluation of surface profiles is rapid and stable, Such separate-surface profiling is advantageous because in many cases a different saw or machine cuts each side of a board. Thus, understanding the separate surface profiles of a board is crucial not only in diagnosing defects in the milling process but also in determining the location of the defects. The device's industrial application is demonstrated through its ability to identify common defects occurring on only one side of lumber samples.
- Subjects
SAWMILLS; PRODUCT quality; LUMBER measurement; QUALITY control; WOOD products manufacturing; MANUFACTURING defects
- Publication
Forest Products Journal, 2008, Vol 58, Issue 9, p72
- ISSN
0015-7473
- Publication type
Article