中文摘要：

利用时域核磁共振（TD-NMR）技术,为研究人造板和水分的关系提供新方法.该文通过研究胶合板（Plywood）、刨花板（Particle board）、中密度纤维板（Medium Density Fiberboard）3种常用人造板吸水过程中水分的自由感应衰减（FID）信号的变化,得出传统称重法得到的吸水率与吸水过程中测得的FID信号高度线性相关,24 h吸水率由大到小依次为胶合板〉刨花板〉中密度纤维板.通过3种人造板24 h吸水过程中自旋-自旋弛豫时间（T2）大小及分布的实验数据,分析了吸水过程中人造板中水分的状态.实验结果证实了TD-NMR是研究人造板与水分的关系的一个有效手段.

英文摘要：

Time-domain nuclear magnetic resonance（TD-NMR） technology may provide a new method to study water absorption in wood-based panels. We measured changes of free induction decay（FID） signal of water in plywood, particle board and medium density fiberboard after a 24-hour soaking process, and the results were correlated to water contents calculated with the traditional weighing method. The amount of water absorption was plywood particleboard medium density fiberboard. The state of water in the panels was analyzed by spin-spin relaxation time（T2） measurements. The result suggested that NMR is an effective tool to study the relationship between wood-based panels and water.