Determination of moisture content and moisture content profiles in wood during drying by low-field nuclear magnetic resonance |
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| Authors: | Kang Xu Yulei Gao Yiqiang Wu Xianjun Li |
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| Affiliation: | 1. State Key Laboratory of Tree Genetics and Breeding, Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing, P. R. China;2. Hunan Provincial Collaborative Innovation Center for High-efficiency Utilization of Wood and Bamboo Resources, Central South University of Forestry and Technology, Changsha, P. R. China;3. College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha, P. R. China |
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| Abstract: | In this article, the low-field nuclear magnetic resonance was used to measure the moisture content (MC) and MC profiles in poplar wood during real-time drying. The T2 distribution curve at each drying stage measured using the Carr–Purcell–Meiboom–Gill pulse sequence provided detailed information in the dynamic change of free water as well as bound water of the whole wood sample. In addition, a new developed SE-SPI pulse sequence was first used to evaluate the spatially resolved T2 distribution of the successive nondestructive sliced layer of wood. Combined with the area integration method, the moisture content in each layer was calculated, and the change of MC profiles within wood at the MC above and below fiber saturation point was well reflected. |
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| Keywords: | Bound water CPMG sequence free water NMR relaxation time SE-SPI sequence wood drying |
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