Effect of grain direction on transmittance of 100-GHz millimeter wave for hinoki (Chamaecyparis obtusa)

Effect of grain direction on transmittance of 100-GHz millimeter wave for hinoki (Chamaecyparis obtusa)
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纹理方向对扁柏 (Chamaecyparis obtusa) 100 GHz 毫米波透过率的影响

DOI:
10.1007/s10086-010-1160-z
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发表时间:
2011
影响因子:
2.9
通讯作者:
Tadao Nagatsuma
Tadao Nagatsuma
中科院分区:
材料科学3区
文献类型:
--
作者:
Soichi Tanaka;Yuko Fujiwara;Yoshihisa Fujii;Shogo Okumura;Hiroyoshi Togo;Naoya Kukutsu;Tadao Nagatsuma

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对厚度为 0.2-2.0 cm 的扁柏 (Chamaecyparis obtusa) 的横切、四分之一锯和平锯板测量了 100 GHz 毫米波线性偏振的衰减系数。这样做是为了检查自由波传播理论将电磁波应用于木材的适用性。研究发现,当板材纤维方向平行于入射波电场方向时,毫米波穿过试板的透过率低于纤维方向垂直于电场方向时的透过率,且切向和径向的透过率差异不大。这些发现可以通过使用传播理论和木材的介电特性来定量解释。
The attenuation coefficients of 100-GHz millimeter waves polarized linearly were measured for cross-cut, quarter-sawn, and flat-sawn boards of hinoki (Chamaecyparis obtusa) that were 0.2–2.0 cm thick. This was done to examine the applicability of free-wave propagation theory for applying electromagnetic waves to wood. It was found that the transmittance of a millimeter wave through the specimen boards was lower when the fiber direction of a board was parallel to the direction of the electric field of the incident wave than when the fiber direction was perpendicular to the electric field, and there was little difference in the transmittance between the tangential and radial directions for the former case. These findings can be quantitatively explained by using propagation theory and the dielectric properties of wood.
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