An Electronic System for Monitoring Gradients of Drying Wood

Study of the moisture and temperature diffusion of drying wood requires a practical means of continuous measurement. Existing measurement techniques are evaluated and the design of a composite sensing probe is presented. Performance of a prototype used in connection with a microprocessor-based control system is described. Excitation voltage to the electrodes was provided by low-frequency alternating polarity. Moisture and temperature gradients of a Douglas-fir board drying in a kiln were monitored by this electronic system. Results demonstrate the possible advantages of the instrumentation when applied to industry and research.

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