Research on the relationship between moisture content and the dielectric constant of the tree trunk by the radar wave

Jingxia Lv, Lin Gao, Jian Wen

School of TechnologyBeijing Forestry University, Beijing, China, 100083

Radar wave technology offers a noninvasive, quick determination technique and has potential for the applications of the non-destructive detection (NDT) for the trees trunk and wood based materials. The precision of NDT determination by radar wave is influenced the wood dielectric constant which is closely related to the moisture content of the trees trunk. For our investigations we used TRU trees radar wave to detect the trees trunk. Four typical trees trunks were selected: polar, willow, pine, eucalyptus. Different trees trunks moisture content and dielectric constant were tested under the radar wave frequency respectively. Models of the relationship between moisture content and dielectric constant of the trees trunks were established for improving the accurate of radar wave NDT.