Effect of annual rings on transmission of 100GHz millimeter waves through wood
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For the application of millimeter wave (MMW) technique to nondestructive evaluation of wood, the effect of annual rings on the behavior of a 100 GHz MMW transmitted through wood was examined. The complex amplitude was measured for 2 mm thick flat- (LT) and quarter-sawn (LR) specimens of several species with different annual ring structures at 11 % moisture content, of which the density distribution was measured using X-ray radiography. For the LT specimens of all species and the LR specimens with small density fluctuation or with earlywood width smaller than the wavelength of the MMW (=3 mm), the amplitude and phase of the transmitted wave were similar to those of the wave without a specimen. For the LR specimen with large density fluctuation and with earlywood width close to or larger than the wavelength, the amplitude and phase were different from those of the wave without a specimen. All the measured complex amplitudes were well expressed using a diffraction model. It was concluded that the MMW is deformed by the density distribution, and then its components with periods shorter than the wavelength by diffraction are attenuated.
収録刊行物
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- Journal of Wood Science
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Journal of Wood Science 59 (5), 375-382, 2013-10
Springer Japan
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詳細情報 詳細情報について
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- CRID
- 1050845760732546944
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- NII論文ID
- 120005526702
- 40019826164
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- NII書誌ID
- AA11200007
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- ISSN
- 14350211
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- HANDLE
- 2433/193011
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- NDL書誌ID
- 024929662
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- IRDB
- NDL
- CiNii Articles