波谱学杂志2017，Vol.34Issue(4)：508-518,11.DOI:10.11938/cjmr20172561
用于木材水分检测的单边核磁共振传感器设计
A Unilateral Nuclear Magnetic Resonance Sensor for Nondestructive Wood Moisture Measurements
摘要
Abstract
An unilateral nuclear magnetic resonance (UMR) sensor was designed to measure wood moisture nondestructively. The sensor consisted of a unilateral magnet, an anti-eddy current module, a radiofrequency (RF) coil and an impedance matching and tuning circuit. The sensor produced a static magnetic field of 71.1 mT (resonant frequency:3.027 MHz) in a 50 mm×50 mm plane locating 75 mm above the sensor's surface. Preliminary nondestructive measurement of wood moisture was carried out with the sensor. The moisture distribution in the radical direction of a cylindrical wood sample was scanned. Variations in transverse relaxation time (T2) from the bark to core were obtained. Evaporation of moisture during wood drying was also measured with the UMR sensor. Experimental results showed that: the peak of long T2 component in the T2 spectrum moved to left and the peak integral area decreased gradually during drying. The integral area was proportional to the moisture content of the sample. The work presents a portable UMR device for wood research which may potentially be used for nondestructive moisture measurement on living trees in situ.关键词
单边核磁共振(UMR)/传感器/木材/水分/无损检测Key words
unilateral nuclear magnetic resonance (UMR)/sensor/wood/moisture/non-destructive detection分类
数理科学引用本文复制引用
余登洁,郭盼,吴嘉敏,贺玉成,徐征..用于木材水分检测的单边核磁共振传感器设计[J].波谱学杂志,2017,34(4):508-518,11.基金项目
国家自然科学基金资助项目(51677008). （51677008）
