The properties of a stress wave transmitted through wood during drying are influenced by the factors such as its temperature and moisture gradient as well as its moisture content. The effects of these factors on the variation of stress wave velocity and signal amplitude were investigated. It was confirmed that the temperature effect is partially attributed to the property change of a transducer. The effect of the moisture gradient on the velocity of the stress wave varies with the average moisture content of a board. The transit times of stress waves transmitted through a board during kiln drying reflect the temperature steps in the drying schedule and the transducer temperature steps.
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