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Journal of Wood Science

Official Journal of the Japan Wood Research Society

Fig. 4 | Journal of Wood Science

Fig. 4

From: Simultaneous detection of density, moisture content and fiber direction of wood by THz time-domain spectroscopy

Fig. 4

a Relationship between the reference values of angle between fiber direction and THz orientation, and predicted value from THz signal (RH = 85%). b Relation between relative humidity and intercept (opened square) and correlation coefficient (closed circle) of regression line between reference values of angle between fiber direction and THz orientation

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