射频下木材的介电性质

›› 1964, Vol. 10 ›› Issue (3): 233-245.

射频下木材的介电性质

李先泽

中国林业科学研究院木材工业研究所

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1964-07-01 发布日期:1964-07-01

THE DIELECTRIC PROPERTIES OF WOOD IN THE RADIO FREQUENCY REGION

Li Xianze

Institute of Wood Industries,Academy of Forest Science

Received:1900-01-01 Revised:1900-01-01 Online:1964-07-01 Published:1964-07-01

摘要/Abstract

摘要： 本文测量了16种木材射频下的介电常数及损失角的正切,其中仅对泡桐、鱼鳞云杉、白桦进行了详细的测量。在低含水率(3%以下)下,观察到上述3种木材的介电常数,随着频率而缓慢地变化;损失角的正切,随着频率增高而逐渐增大,至某一频率后,又渐减小。电导率的对数与频率的对数成直线。所测量的全部木材在绝干状态时,其介电常数与密度的关系,符合Clausius-Mosotti 关系:含水率越高,介电值越大;纵向介电值高于径、弦向,径向和弦向的则大致相同。文中讨论了这些结果。

Abstract: The dielectric constants and loss tangents of wood of 16 tree species in the radio frequency region have been measured. Results for the three species,Paulownia fortunei Hemsl.,Picea jezoensis Carr.and Betula albo-sinensis Burk.are presented in some detail.At low moisture content (below 3%),in these species the dielectric constants vary slowly and the maximum values of the various loss tangents occur with the frequency.The curves of 1gσ—1g for the above species are presented as straight lines.The relationship of all specimens between the dielectric constant and density based on the dry wood is in agreement with the Clausius-Mosotti relation.The dielectric values increase with increasing of the moisture content.The dielectric values are the highest in the longitudinal direction,and in the other two directions they are approximately the same.

李先泽. 射频下木材的介电性质[J]. , 1964, 10(3): 233-245.

Li Xianze. THE DIELECTRIC PROPERTIES OF WOOD IN THE RADIO FREQUENCY REGION[J]. , 1964, 10(3): 233-245.