摘要
利用电容器的电特性设计制作一种粮食水分测定装置,以快速测定大米水分含量。由于以大米为介质的圆柱形电容器电容极小,故设计了微小电容测量电路,即以M328单片机为核心的测量仪。传感器部分为铜质圆筒电容,通过实验测量分析出了粮食水分检测时的各项参数如粮食含水率、载装密度对于电容值的贡献率,进行误差分析并得出电容含水率载装密度的拟合函数。最后还分项进行单一变量的探究实验,分析每一因素对电容的影响程度,发现在偏差允许范围内,得出的电容计算公式具有较高的准确度,制作的水分测定装置能够较为准确地检测出粮食的水分,可适用于生活中基本粮食水分测量。
In order to determine the water content of rice quickly, a device for measuring the moisture in grain is designed and produced by using the electrical characteristics of the capacitor. Because the capacitance of the cylindrical capacitor which uses rice as the medium is very small, a micro capacitance measurement circuit is designed with M328 MCU as its core measuring instrument. The sensor part is the copper cylinder capacitance. Through the experimental measurement and analysis, the contributions of parameters to the capacitance value are analyzed in detection of moisture in grain such as the moisture content and the loading density. Based on the error analysis, and the fitting function among the capacitance, the moisture content and the loading density is obtained. Finally, we need the groping experiment to analyze the influence of each factor on the capacitance. It is found that the formula of capacitance calculation has a high accuracy in the allowable range of deviation. Overall, the water measuring device can accurately detect the moisture content in food, and can be applied to the basic measurement of moisture in grain in our daily life.
作者
李靖轩
冷文秀
LI Jingxuan;LENG Wenxiu(Institute of Petroleum Engineering,China University of Petroleum (Beijing),Beijing 102200;School of Science,China University of Petroleum (Beijing),Beijing 102200)
出处
《物理与工程》
2019年第2期100-105,共6页
Physics and Engineering
基金
中国石油大学(北京)教改项目
