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首页> 外文会议>International Symposium on Nondestructive Testing of Wood; 20000913-20000915; Sopron; HU >Measurement of moisture gradient in wood by Electrode Scanning Moisture Analysis ESMA
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Measurement of moisture gradient in wood by Electrode Scanning Moisture Analysis ESMA

机译：通过电极扫描水分分析ESMA测量木材中的水分梯度

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摘要

A new principle of a dielectric moisture meter measuring moisture gradient in wood was proposed. This method is named Electrode Scanning Moisture Analysis (ESMA ) because a moisture signal is detected by measuring a capacity change during electrode scanning. The capacity decreased logarithmically with increase of an electrode distance, and patterns of capacity-electrode distance curve reflected the moisture content distribution in wood. The moisture distribution was denoted by a first kind Fredholm type integral equation by using a capacity change due to change of an electrode distance and a kerner function which was given by capacity sensitivity per unit moisture content. The integral equation was solved by rewriting it to a system of simultaneous linear equations. The solution was unstable and showed "ill-posed" problem. However, a post smoothing of data using a least square method showed good reproduction of the original moisture distribution. These results showed that the principle of the electrode scanning moisture analysis is effective to estimate the moisture gradient in wood.
机译：提出了一种测量木材中水分梯度的介电水分仪的新原理。由于通过测量电极扫描过程中的电容变化来检测水分信号，因此该方法被称为电极扫描水分分析（ESMA）。容量随着电极距离的增加而呈对数减少，容量-电极距离曲线的图形反映了木材中的水分分布。通过使用由于电极距离的变化引起的容量变化和由每单位水分含量的容量灵敏度给出的kerner函数，由第一类Fredholm型积分方程表示水分分布。通过将积分方程重写为联立线性方程组来求解积分方程。该解决方案不稳定，并显示“不适定”问题。但是，使用最小二乘法对数据进行后期平滑处理后，可以很好地再现原始水分分布。这些结果表明，电极扫描水分分析的原理可以有效地估计木材中的水分梯度。

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