Flaw detection system using microwaves

Details Flaw detection system using microwaves Flaw detection system using microwaves

1983-01-28

1985-04-30

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 585R, G01R 2704

Patent

active

045146802

ABSTRACT:
A method and an apparatus for detection of flaws in lumber is provided, in which the lumber is subjected to microwave radiation of equal intensity in turns simultaneously from two microwave radiation means in phase opposition and from an intermediate microwave radiation means and between the turns from none of said microwave radiation means. The microwave radiation transmitted through the lumber is measured and the level of the measured signals in pulse form is adjusted in such a way that the mean value of the pulse train equals a reference value. The level of the pulse train when no radiation is transmitted is adjusted to zero and the level of the pulses when said two microwave radiation means in phase opposition radiate is used as a measure of the size of the flaw in the lumber.

REFERENCES:
patent: 3810005 (1974-07-01), Bennion
patent: 3826978 (1974-07-01), Kelly
patent: 3956695 (1976-05-01), Stamm
patent: 4123702 (1978-10-01), Kinanen

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