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Identification of free and bound water content in wood by means of NMR relaxometry

机译：通过NMR弛豫测定法识别木材中的自由和结合的水含量

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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：核磁共振的先进技术（NMR）弛豫仪使能为木材中的水分含量而异，而且是自由和结合水的含量。同时识别木材中的两种水系统在木材中的水分转移调查中尤为重要。本文介绍了最常见的波兰木材种类的旋转晶格松弛时间和水分含量之间的关系..苏格兰松树。用于松弛时间测定的样品是从杉木的心脏和Sapwood获得的。使用旋转分组方法的CracSpin计算机程序应用于进行旋转晶格松弛时间的分离。对于纤维饱和点（FSP）以上的水分含量，获得了与两个自由和结合水相关的松弛时间的两种组分。虽然在FSP下面只确定了一个组件。获得的结果通过经验模型概括。讨论了Heartwood和Sapwood的放松时间之间的差异。

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