Korkua Suratsavadee K, Sakphrom Siraporn
School of Engineering and Technology, Walailak University, Thailand.
Heliyon. 2020 Aug 4;6(8):e04555. doi: 10.1016/j.heliyon.2020.e04555. eCollection 2020 Aug.
In this study, we analyze a non-invasive and low-cost wood moisture meter by means of a capacitive detection circuit. The process of the design and development of an oil-palm-wood moisture meter is described. As part of the study, two electrode structures, i.e., parallel-plate and coplanar electrodes, are tested. The capacitive detection circuit includes a square-wave-generator circuit, low-pass filter circuit, and signal-conditioning circuit. The frequencies of the square-wave excitation signal are in the range of 200 kHz and are analyzed via a microcontroller to interpret the percentage of oil-palm-wood moisture content. The applicability of the capacitive moisture measurement is investigated under various moisture conditions of the oil palm wood i.e., 5%-20%. The experimental results show that the measurement accuracy of the detection circuit is high, with an acceptable measurement error.
在本研究中，我们通过电容检测电路分析了一种非侵入式低成本木材湿度计。描述了油棕木材湿度计的设计与开发过程。作为研究的一部分，测试了两种电极结构，即平行板电极和共面电极。电容检测电路包括方波发生器电路、低通滤波器电路和信号调理电路。方波激励信号的频率在200 kHz范围内，并通过微控制器进行分析以解读油棕木材的含水率百分比。在油棕木材5%-20%的各种湿度条件下研究了电容式湿度测量的适用性。实验结果表明，检测电路的测量精度很高，测量误差可接受。
