Non-destructive testing methods for lumber

Details Non-destructive testing methods for lumber Non-destructive testing methods for lumber

G - Physics

01

N

33/169, 354/21

G01N 33/46 (2006.01)

Patent

CA 1327400

Non-Destructive Testing Methods for Lumber Abstract A non-destructive testing system for lumber involves measurement of grain angle about a board and transformation of the measured grain angle values to extract features indicative of knot identification, grain angle perturbations or strength of the board. Individual boards can then be processed for grading or sorting purposes as a function of the extracted features. Specific features utilized for knot identification are curl, divergence, and novel transformations termed gradient, edges and knots, as well as various pattern matching techniques. strength estimation involves transformations pertaining to failure distance, which is a function of board tensile strength. Failure distance can be computed by a tracks model. When utilized in conjunction with conventional bending test procedures, highly accurate strength estimation is achieved by the described system.

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