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Title: Effect of annual rings on transmission of 100 GHz millimeter waves through wood
Authors: Tanaka, Soichi  kyouindb  KAKEN_id
Fujiwara, Yuko
Fujii, Yoshihisa
Okumura, Shogo
Togo, Hiroyoshi
Kukutsu, Naoya
Mochizuki, Shoji
Author's alias: 田中, 聡一
藤井, 義久
Keywords: Millimeter wave
100 GHz
NDE
Annual rings
Diffraction
Issue Date: Oct-2013
Publisher: Springer Japan
Journal title: Journal of Wood Science
Volume: 59
Issue: 5
Start page: 375
End page: 382
Abstract: 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.
Rights: The final publication is available at Springer via http://dx.doi.org/10.1007/s10086-013-1342-6.
This is not the published version. Please cite only the published version.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/193011
DOI(Published Version): 10.1007/s10086-013-1342-6
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