Abstract
The combined method is based on using an electrical method for moisture gradient monitoring and an acoustic emission method for detection of microcracking. In the method, electrodes are used to create an electric field in drying wood and to measure the electric complex spectrum using the impedance spectroscopy method, while at the same time measuring acoustic emissions from drying wood. The result can be used for calculating the parameters required for determining the stress state prevailing in the wood. The spectrum is affected by the properties of the wood, such as moisture content, moisture gradient, temperature, density and structure. When the electric complex spectrum and acoustic emission response are determined at the same time, it is possible to estimate both the main reason for the stresses (moisture gradient) and the outcome (microcracking and macrocracking). The results may be used to control drying to achieve wood products of superior quality. The method was studied and tested both in the laboratory and in industrial kilns.
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