摘要
为了能够在粮食的收购、干燥、储存过程中，快速、准确的测量粮食水分，根据电容器的电特性受介质影响的原理，提出了用介质损耗因数测量粮食水分的方法。给出了以AT89C52单片机为核心的粮食水分测试系统的硬件结构组成，采用相敏检波正交分离法测量介质损耗因数。通过对传感器的标定并对测试数据进行相应的回归处理，得到了介质损耗因数和粮食水分的函数关系。通过对山融1号小麦试验结果表明，该方法重复性好，测量精度高，水分含量在13％～26％范围内，最大误差小于0．5％。
Based on the principle that electricity characteristic of capacitor was influenced, the method for measuring grain moisture content by dielectric loss tangent was put forward. The hardware structure of grain moisture measuring instrument was developed on the basis of AT89C52 single-chip computer. The method for signal processing and measuring was described in detail. Through demarcating sensor and corresponding regressive processing, the relationship between dielectric loss tangent and grain moisture content can be obtained. If only dielectric loss tangent of grain was measured, the measuring system can acquire grain moisture content by seeking table and calculating. The results of experiments show that it has high accuracy and good repeatability.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2006年第2期14-17,共4页
Transactions of the Chinese Society of Agricultural Engineering
关键词
粮食水分含量
测量
介质损耗因数
单片机
传感器
grain moisture content
measurement
dielectric loss tangent
single-chip processor
sensor
作者简介
李业德（1962-），男，山东淄博市人，教授，工学硕士，硕士生导师，主要从事农业电气化与自动化、智能仪器仪表研究、计算机应用。山东省淄博市张店区张周路12号山东理工大学计算机学院，255049。Email：liyede@sdut．edu．cn
