Flaw detection method using microwaves

Details Flaw detection method using microwaves Flaw detection method using microwaves

G - Physics

01

R

340/124.3

G01R 27/04 (2006.01) G01N 22/02 (2006.01) G01N 33/46 (2006.01)

Patent

CA 1216042

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.

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