Effect of Diffraction on Millimeter Wave Transmission Image of Wood
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- TANAKA Soichi
- Materials Res. Inst. of Tech., Advanced Industrial Sci. and Tech.
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- FUJIWARA Yuko
- Graduate School of Agriculture, Kyoto Univ.
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- FUJII Yoshihisa
- Graduate School of Agriculture, Kyoto Univ.
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- OKUMURA Shogo
- formerly Graduate School of Agriculture, Kyoto Univ.
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- TOGO Hiroyoshi
- NTT Microsystem Integration Lab., NTT Co.
Bibliographic Information
- Other Title
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- 木材のミリ波透過像に及ぼす回折の影響
- モクザイ ノ ミリハ トウカゾウ ニ オヨボス カイセツ ノ エイキョウ
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Abstract
A practical method to detect wood annual ring structure has been limited to the ionizing radiation such as X-ray though the structure is important in determining the dimensional stability and strength of wood. A millimeter wave technique has attracted much attention as a new technique that can detect the annual ring structure. The relation of annual ring structure to the millimeter wave image, however, has been obscure because the wave is diffracted in wood. In this paper, the effect of diffraction on the millimeter wave image was investigated. The transmission images of the MMW transmitted through 2 mm thick quarter-sawn specimens of six wood species were obtained as the distributions of phase shift and attenuation, and they were compared with the density distributions obtained by the X-ray radiography. The phase shift and attenuation distributions did not always match the density distribution. The electromagnetic wave transmission model considering diffraction well explained this mismatch. This indicates that the diffraction affects the millimeter wave transmission image of wood.
Journal
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- Journal of the Society of Materials Science, Japan
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Journal of the Society of Materials Science, Japan 63 (4), 326-330, 2014
The Society of Materials Science, Japan
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Details 詳細情報について
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- CRID
- 1390001205445215616
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- NII Article ID
- 130003393272
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- NII Book ID
- AN00096175
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- ISSN
- 18807488
- 05145163
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- NDL BIB ID
- 025475751
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed