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논문 기본 정보

자료유형
학술저널
저자정보
Kim, Chul-Ki (Department of Forest Products, National Institute of Forest Science) Kim, Kwang-Mo (Department of Forest Products, National Institute of Forest Science) Lee, Sang-Joon (Department of Forest Products, National Institute of Forest Science) Lee, Jun-Jae (Department of Forest Sciences, Seoul National University)
저널정보
한국목재공학회 목재공학(Journal of the Korean Wood Science and Technology) 목재공학 제45권 제6호
발행연도
2017.1
수록면
836 - 845 (10page)

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Gravimetric method is usually used to evaluate air-dry density, which is governing physical or mechanical properties of wood. Although it had high evaluation accuracy, the method is time consuming process. Thus, this study was conducted to estimate air-dry density of wood with high accuracy by using polychromatic X-ray and digital detector as alternative of gravimetric method. To quantify polychromatic X-ray projection for evaluating air-dry density, Lambert-Beer's law with the integral value of probability function was used. The integral value was used as weighting factor in the law, and it was determined by conducting simple test at various penetration depths and tube voltage. Mass attenuation coefficient (MAC) of wood also calculated by investigating polychromatic X-ray projection according to species, penetration depth and tube voltage. The species had not an effect on change of MAC. Finally, an air-dry density of wood was estimated by applying the integral value, MAC and Lambert-Beer's law to polychromatic X-ray projection. As an example, the relation of the integral value (${\alpha}$) according to penetration depth (t, cm) at tube voltage of 35 kV was ${\alpha}=-0.00091t{\times}0.0184$ while the regression of the MAC (${\mu}$, $cm^2/g$) was ${\mu}=0.5414{\exp}(-0.0734t)$. When calculation of root mean squared error (RMSE) was performed to check the estimation accuracy, RMSE at 35, 45 and 55 kV was 0.010, 0.013 and $0.009g/cm^3$, respectively. However, partial RMSE in relation to air-dry density was varied according to tube voltage. The partial RMSE below air-dry density of $0.41g/cm^3$ was $0.008g/cm^3$ when tube voltage of 35 kV was used. Meanwhile, the partial RMSE above air-dry density of $0.41g/cm^3$ decreased as tube voltage increased. It was conclude that the accuracy of estimation with polychromatic X-ray and digital detector was quite high if the integral value and MAC of wood were determined precisely or a condition of examination was chosen properly. It was seemed that the estimation of air-dry density by using polychromatic X-ray system can supplant the gravimetric method.
#wood #density #polychromatic X-ray #digital detector #Lambert-Beer's law #mass attenuation coefficient of wood

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참고문헌 (15)

참고문헌 신청
Brooks, R. A. / 1976 / Beam hardening in x-ray reconstructive tomography / Physics in medicine and biology 21(3):390 google schola Bucur, V. / 2013 / Nondestructive characterization and imaging of wood / Springer-Verlag Berlin Heidlberg google schola Goy, B. / 1992 / The measurement of wood density by microwave sensor / Holz als Roh-und Werkstoff 50(4):163~166 google schola Hoffmeyer, P. / 1995 / Evaluation of density and strength of Norway spruce wood by near infrared reflectance spectroscopy / European Journal of Wood and Wood Products 53(3):165~170 google schola Kaelble, E.F. / 1967 / Handbook of X-rays / McGraw-Hill Education google schola

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