Accurate measurement of dynamic distribution of moisture content in wood during microwave drying is the prerequisite for realizing optimal control of drying process and in-depth study of drying mechanism.Conventional hot-air drying is widely used in practical production because of its mature technology and large loading capacity. With the advantages of integral heating and fast drying speed, it has been applied to the drying of precious and Difficult-to-dry wood to a certain extent.
Previous studies have shown that there exists an internal high and external low moisture gradient field opposite to the temperature gradient in the wood during conventional hot air drying. Some scholars have conducted preliminary studies on the distribution of moisture content in wood during microwave drying, but the results are not consistent. Some scholars believe that the moisture content in wood during microwave drying is different. Some experimental results show that the moisture content of wood inner layer is higher than that of surface layer in microwave drying, and there is no moisture gradient field contrary to that of conventional hot air drying. In addition to the rapid moisture migration and the rapid change of moisture content distribution in wood, it is very difficult to accurately determine the moisture content. Another important reason is that an ideal method for measuring the dynamic distribution of moisture content has not been found.
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