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

Authors

  • William L. James

Keywords:

Dielectric properties, electrode design, moisture gradients

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.

References

Jamis, W. L. 1981. Influence of electrode design on measurements of dielectric properties of wood. Wood Sci. 13(4):185-198.nMackay, J. F. G. 1976. Effect of moisture gradients on the accuracy of power-loss moisture meters. For. Prod. J. 26(3):49-52.n

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Published

2007-06-28

Issue

Number 2 / April 1986

Section

Research Contributions

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