Method for determining the presence of knots or voids in wood

Details Method for determining the presence of knots or voids in wood Method for determining the presence of knots or voids in wood

1993-07-14

1994-10-18

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250330, 2503581, 2503591, G01N 2101, G01N 2572

Patent

active

053571126

ABSTRACT:
A method for determining the presence of knots and/or voids in lumber surfaces by uniformly heating the wood and then submitting the wood to an infrared camera, providing a thermal image of the surface of the wood. Knots and voids heat differently from the remaining wood areas, the differential heating being observed by the inspection of the thermal image, or more preferably by conversion of the image to a digital signal which is communicated to a frame grabber and data processor, permitting frame-by-frame inspection of the heat distribution on the surface of the wood. Locations of differential heating corresponding to knots and voids are detected, and can be communicated to subsequent processing devices, to either exclude all or some of the defect areas, or control the use to which the defect-bearing wood is put.

REFERENCES:
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patent: 3976384 (1976-08-01), Matthews et al.
patent: 4764017 (1988-08-01), Hiruonen
patent: 4827142 (1988-05-01), Hatje
patent: 4854724 (1989-08-01), Adams et al.
patent: 4879752 (1989-11-01), Aune et al.
patent: 4886370 (1989-12-01), Koshihara et al.
patent: 4899356 (1990-02-01), Berry et al.

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