Apparatus and method for measuring wood grain angle

Details Apparatus and method for measuring wood grain angle Apparatus and method for measuring wood grain angle

1989-06-06

1990-11-20

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324688, 324690, G01R 2726

Patent

active

049721542

ABSTRACT:
Wood grain angle information is detected electronically by use of a sensor having a common electrode and a plurality of electrodes spaced from the common electrode and arranged angularly about a sensor axis. The common electrode can serve as a sense electrode or as a drive electrode for the remaining angularly spaced electrodes. By modulating applied drive signals and demodulating the sensed signals that result from capacitive coupling of an adjacent wood specimen, values that are a function of wood grain angle are identified.

REFERENCES:
patent: 3515987 (1970-06-01), Zurbrick et al.
patent: 3805156 (1974-04-01), Norton et al.
patent: 4007454 (1977-02-01), Cain et al.
patent: 4433332 (1984-02-01), Wason
James, W. L., 1975, "Dielectric Properties of Wood & Hardboard: Variations with Temperature, Frequency, Moisture Content, and Grain Direction", USDA Forest Service Research Paper FPL 245, Madison, Wis.
Bechtel, F. K. and Allen, J. R., "Methods of Implementing Grain Angle Measurements in the Machine Stress Rating Process", Sixth Nondestructive Testing of Wood Symposium, Washington State University, Pullman, Wash., Sep. 1987.
Metriguard, Inc., Product Brochure-Grain Angle.

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