Slope-Of-Grain Indicator

A noncontact slope-of-grain indicator that should be suitable for continuous inspection of lumber has been developed and is being patented. The dielectric constant parallel to the grain in most woods is approximately l.5 times greater than the dielectric constant across the grain. A rotating capacitance-type transducer senses this difference and generates a corresponding, sine wave with the maxima corresponding to the grain direction. Phase comparison with a reference wave indicates in degrees how much the grain direction differs from the longitudinal direction of the wood. The unit, which is independent of moisture content, density and species, is designed for automatic grading.

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