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- Title
Oblique radiographic measurement of knot position and orientation in logs.
- Authors
Schajer, Gary S.
- Abstract
A novel X-ray scanner system to identify the positions of knots in logs is described. The scanner has a simple, low-cost design that is suitable for use in medium and smaller sawmills. It makes X-ray measurements in an oblique direction as the log moves longitudinally past the X-ray source and line-detector. This unconventional oblique measurement direction creates a more side-on view that better reveals the spatial arrangement of the knots within the log. This view, when combined with the knowledge that all knots start from along the pith and radiate outwards gives sufficient information to identify knot orientations in space. Experimental oblique X-ray measurements on a sample log are described, followed by the processing and analysis of the measured radiographs, and a comparison of the results with independent measurements of knot locations. With the knot identification algorithms developed, knot axial position could be identified within 11 mm, and knot circumferential orientation with a root mean square (rms) error of 7.9°–11.6° when using a single view X-ray scanner, or 5.6°–7.7° when using a dual view scanner.
- Subjects
ROOT-mean-squares; SPATIAL arrangement; SAWLOGS
- Publication
Journal of Wood Science, 2024, Vol 70, Issue 1, p1
- ISSN
1435-0211
- Publication type
Article
- DOI
10.1186/s10086-024-02135-3