The Interaction of Electrode Design and Moisture Gradients in Dielectric Measurements on Wood

William L. James

Abstract


Measurement of dielectric properties (capacitance and equivalent parallel conductance) of specimens with various moisture gradients, using twenty different electrode designs, showed that no electrode design eliminated the effect of moisture gradients on the measured average dielectric properties. A parallel-plate electrode, with poles on opposite faces of the specimen, was influenced least by moisture gradients, but as applied to dielectric moisture meters, the improvement did not appear to warrant the inconvenience of making contact with both sides of the specimen. There was a weakly defined indication that a dielectric moisture meter using the capacitance principle and operating at about 10 kHz would be least affected by moisture gradients.

Keywords


Dielectric properties;electrode design;moisture gradients

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