Method for classifying and measuring of timbers

Details Method for classifying and measuring of timbers Method for classifying and measuring of timbers

1977-09-22

1978-10-31

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

209576, G01R 2704

Patent

active

041237021

ABSTRACT:
Lumber is classified in terms of knots. The method used employs high frequency radio energy and a detector responsive to phase to detect the energy passing through the lumber. The knots exhibit a different dielectric constant, the real part of which is different from normal wood, and the difference in phase of the radiation detected effects the measurement. Preferably, the frequency radiation is near 10 GHz.

REFERENCES:
patent: 2659860 (1953-11-01), Breazeale
patent: 3498112 (1970-03-01), Howard
patent: 3501692 (1970-03-01), Kluck
patent: 3534260 (1970-10-01), Walker
patent: 3562642 (1971-02-01), Hochschild
patent: 3786330 (1974-01-01), Inoue et al.
patent: 3810005 (1974-05-01), Bennion et al.

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