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首页> 外文会议>International Symposium on Nondestructive Testing of Wood; 20000913-20000915; Sopron; HU >Identification of free and bound water content in wood by means of NMR relaxometry
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Identification of free and bound water content in wood by means of NMR relaxometry

机译：核磁共振弛豫法鉴定木材中游离和结合水含量

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The advanced techniques of Nuclear Magnetic Resonance (NMR) relaxometry enable to determine not only moisture content in wood but also contents of free and bound water. Simultaneous identification of both subsystems of water in wood is especially important in investigations of moisture transfer in wood. This paper presents the analysis of the relationship between the spin-lattice relaxation time and moisture content of the most common Polish wood species i.e. Scots pine. Samples for the relaxation time determination were obtained from both heartwood and sapwood of pine. The CracSpin computer program using the spin-grouping method was applied to perform the separation of the spin-lattice relaxation times. For moisture contents above the Fiber Saturation Point (FSP) there were obtained two components of the relaxation time related to two free and bound water. While below the FSP only one component was identified. The obtained results were generalized by empirical models. Differences between relaxation times for heartwood and sapwood were discussed.
机译：核磁共振（NMR）弛豫法的先进技术不仅可以确定木材中的水分含量，还可以确定游离水和结合水的含量。同时确定木材中水的两个子系统对于研究木材中水分的传递尤为重要。本文介绍了自旋晶格弛豫时间与最常见的波兰木材物种即苏格兰松树的水分含量之间的关系的分析。从松材的心材和边材中获得用于确定松弛时间的样品。应用使用自旋分组方法的CracSpin计算机程序执行自旋晶格弛豫时间的分离。对于高于纤维饱和点（FSP）的水分含量，获得了与两种游离水和结合水有关的弛豫时间的两个分量。在FSP以下，仅确定了一个组件。所得结果通过经验模型进行了概括。讨论了心材和边材的松弛时间之间的差异。

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