Anisotropic Gloss of Wood and Light Reflection at the Surface of Lumina

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  • 木材の光沢異方性および細胞内こう面からの反射について
  • モクザイ ノ コウタク イホウセイ オヨビ サイボウナイコウメン カラ ノ ハ

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Abstract

The primary cause of the characteristic gloss of wood is thought to be reflection of light at many micro concaves i.e. lumina like as gloss of silk. To separate reflection at inner surface and at cut surface of cell walls, specimens with inclined fiber (diving angle a) were made with microtome. Goniophotometric curves of specimens showed two types of peaks of specular reflection; the one peak at θ showing reflection at cut surface of cell walls and the others at θ± 2α showing reflection at surface of lumina. In the case of hinoki (Japanese cypress) the intensity of the reflection at surface of lumina was stronger than that at cut surface of cell walls. But in the case of heavy wood like bintangor, reflection at surface of lumina was considerably small. Measurement of specular glossiness of specimens with different diving angle a was also carried out. The glossiness decreased greatly with small inclination of the fiber direction. Surface boundary reflection and scatterd reflection were separated by means of goniophotometry using polarized light. Microscopic observation under vertically incident light was also carried out.

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