Methods for detecting compression wood in lumber

Details Methods for detecting compression wood in lumber Methods for detecting compression wood in lumber

2006-09-27

2009-06-09

Toatley, Jr., Gregory J (Department: 2877)

Optics: measuring and testing

Of light reflection

With diffusion

C250S330000, C250S559420, C356S431000, C356S445000, C356S237100, C702S155000, C702S033000, C702S040000

Reexamination Certificate

active

07545502

ABSTRACT:
Methods are provided for detecting compression wood, blue stain, or pitch in lumber. A light beam is projected towards the wood sample. Line or area cameras acquire images of light that is reflected from the wood sample. Based on the intensity of the reflected light at one or more locations on the wood sample, compression wood, blue stain, or pitch may be detected.

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Nystrom J et al, “Automatic measurement of fiber orientation in softwoods by using the tracheid effect,” Comp & Elec in Ag, Elsevier Neth, vol. 41, No. 1-3, pp. 91-99, Dec. 2003.

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