波谱学杂志2016，Vol.33Issue(3)：479-490,12.DOI:10.11938/cjmr20160313
利用TD-NMR技术研究杨木高温干燥过程水分分布
Water Distribution in Poplar during High-Temperature Drying Process Studied by Time-Domain Nuclear Magnetic Resonance
摘要
Abstract
Moisture in wood affects its physical properties. Time-domain nuclear magnetic resonance (TD-NMR) technique can be used to monitor water state changes and migration, providing a powerful tool to study changes of water in wood during drying and product processing. In this study, water states and migration in Beijing poplar were monitored by TD-NMR during high-temperature drying. Free induction decay (FID) and transverse relaxation time (T2) of water were measured. The results showed that bothFID andT2 signals were linearized with moisture content, hence the moisture content in the whold drying process can be calculated. Free water with long relaxation time in heart wood showed a trend of first decrease and then increase and decrease again at last, this phenomenon did not happen in the sap wood. In the heart wood, the most abundant moisture is the water with magnitude of 10 ms relaxation time. But the moisture content of each water state has small difference in sap wood, and the most abundant moisture is the water with magnitude of 100 ms relaxation time. During high temperature drying process, the moisture percentage decrease faster in sap wood than that in heart wood, and the evaporation rate of free water is significantly faster than the bound water.关键词
时域核磁共振(TD-NMR)/水分分布/横向弛豫时间(T2)/北京杨/高温干燥Key words
time-domain NMR (TD-NMR)/water distribution/transverse relaxation time (T2)/Beijing poplar/high temperature drying分类
数理科学引用本文复制引用
高玉磊,李新宇,雷鹏,张明辉..利用TD-NMR技术研究杨木高温干燥过程水分分布[J].波谱学杂志,2016,33(3):479-490,12.基金项目
国家自然科学基金资助项目(30800866,31160141) （30800866,31160141）
