Moisture content measurement

Valutec has spent three years developing methods for measuring moisture content using different radio frequencies. The technique is based on measuring a spectrum of radio frequencies. This reveals the characteristics for the material being examined. Through advanced signal analysis the method can predict moisture content and other characteristics. Two aerials are placed at either end of a batch kiln, a sender and a receiver aerial.

The method does not require physical contact with the wood, so operators avoid having to attach sensors to the wood at the start of the process. The electronic measuring unit is outside the heated environment and it measures attenuation and phase shifting of radio waves that go through the wood, which is then converted to a moisture content value.

Measured values can then be used as input data for control of the drying process. They can be used for monitoring, indicate when the moisture content target has been achieved or used as a control parameter for loading progressive kilns.



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