Method and apparatus for detection of knots or the like in sawn

Details Method and apparatus for detection of knots or the like in sawn Method and apparatus for detection of knots or the like in sawn

1983-09-06

1986-08-19

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 2704

Patent

active

046072128

ABSTRACT:
A method and an apparatus for detection of knots in lumber by means of microwave radiation. Radiation from a transmitter is directed toward a piece of lumber and the radiation reflected from and/or passed through the piece of lumber is detected by means of a receiver. A radiation field having a TEM wave mode is established on the surface of the piece of lumber by means of a transmitter, whereby a radiation field which includes a TM wave mode component is generated in a knot in the piece of lumber and this is detected by means of a receiver.

REFERENCES:
patent: 4123702 (1978-10-01), Kinanen et al.
patent: 4123703 (1978-10-01), Robinson
patent: 4492915 (1985-01-01), Caspers

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