文献类型：期刊文献

英文题名：Determination of moisture content and moisture content profiles in wood during drying by low-field nuclear magnetic resonance

作者：Xu, Kang[1] Lu, Jianxiong[1,2] Gao, Yulei[1] Wu, Yiqiang[2,3] Li, Xianjun[2,3]

第一作者：Xu, Kang

通信作者：Lu, JX[1];Lu, JX[2]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, State Key Lab Tree Genet & Breeding, Beijing, Peoples R China;[2]Cent South Univ Forestry & Technol, Hunan Prov Collaborat Innovat Ctr High Efficiency, Changsha 410004, Hunan, Peoples R China;[3]Cent South Univ Forestry & Technol, Coll Mat Sci & Engn, Changsha, Hunan, Peoples R China

年份：2017

卷号：35

期号：15

起止页码：1909-1918

外文期刊名：DRYING TECHNOLOGY

收录：;EI(收录号：20173003971497);Scopus(收录号：2-s2.0-85025119815);WOS:【SCI-EXPANDED(收录号:WOS:000415891700012)】；

基金：This work was supported by the Forestry Industry Research Special Funds for Public Welfare Projects (201404501). The authors would like to thank the engineer Bing Lu and Hao Ding at Niumag Cor. Ltd. in Shanghai for the technical support.

语种：英文

外文关键词：Bound water; CPMG sequence; free water; NMR; relaxation time; SE-SPI sequence; wood drying

摘要：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 T-2 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 T-2 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.