Detector for heterogeneous materials

Details Detector for heterogeneous materials Detector for heterogeneous materials

1995-06-07

1996-12-17

Nguyen, Vinh P.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324690, 73304C, G01R 2726

Patent

active

055857329

ABSTRACT:
A system for the detection of knots and voids in wood or lumber employs opposed arrays of capacitor plates. The presence of knots and/or voids is detected based on changes in the dielectrical response produced in the electrical fields defined by the opposed capacitor plate arrays. A software system delineates specific knot and void defects determined. Wood or lumber strength can further be estimated by comparing a sensed dielectric value in a clear portion of the lumber or wood with an established dielectric response value for wood of known density. Employing an appropriate correlation factor the relative wood density, coupled with knot/void location and size, permits an estimate of over all wood strength.

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