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首页> 外文期刊>Mathematical Problems in Engineering >The Influence of Specimen Size and Distance to a Surface on Resistive Moisture Content Measurements in Wood
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The Influence of Specimen Size and Distance to a Surface on Resistive Moisture Content Measurements in Wood

机译：试样尺寸和与表面的距离对木材中电阻水分含量测量的影响

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The moisture content of wood is commonly determined by measuring the electrical resistance between two electrodes inserted in the wood. However, problems using this method close to wood surfaces were reported in a previous study. In the present study, the effect of the distance to a surface and the specimen size on the measured electrical resistance was studied analytically as follows. The two electrodes create an electrical potential in the wood specimen. The boundary condition for the electrical potential is that the electrical current across all specimen surfaces is zero, which is achieved by using a suitable array of mirror sources. The analytical solution for the electrical potential was used to analyse the influence of the distance from the electrodes to the specimen surface as well as the size of the specimen. In addition, the error in moisture content was evaluated. The effect of the distance to a surface and the specimen size depended on the equivalent radius of the electrodes; if large electrodes are used in small specimens or close to surfaces, there is a risk that a higher resistance is measured which results in slightly lower measured moisture content than the actual moisture content of the specimen.
机译：木材的水分含量通常是通过测量插入木材中的两个电极之间的电阻来确定的。但是，在先前的研究中报告了使用这种方法接近木材表面的问题。在本研究中，对表面距离和试样尺寸对所测电阻的影响的分析如下。两个电极在木材样本中产生电势。电位的边界条件是所有标本表面上的电流为零，这是通过使用适当的镜像源阵列实现的。电位分析溶液用于分析从电极到样品表面的距离以及样品尺寸的影响。另外，评估了水分含量的误差。到表面的距离和样本大小的影响取决于电极的等效半径；如果在小的样品中或靠近表面的地方使用大电极，则有可能测量到较高的电阻，从而导致测得的水分含量略低于样品的实际水分含量。

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