测量谷物颗粒湿度的微波谐振腔法初步研究  

The Preliminary Research of Microwave Resonator Technique for Moisture Content Determination in Single Kernels

作　　者：尤田束[1] 王春山[2] 叶红[2] 

机构地区：[1]浙江大学分析测试中心,副教授杭州市玉泉路310027 [2]浙江大学

出　　处：《农业工程学报》1994年第2期91-95,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金

摘　　要：介绍一种测量谷物颗粒湿度的微波谐振腔法及其原理和装置,以及它的测量过程和研究的实验结果。实验研究证明,微波谐振腔技术用来测量黄豆颗粒的湿度是一种有价值的方法。当腔用黄豆颗粒加载时,测量的是谐振频率和传输系数的改变值,所以,对测量系统的稳定性要求不太苛刻。这一测量技术也可以用来测量稻谷、麦子及其它种籽的湿度。The purpose of this research is to determine the effect of soybean seed of different sizes and sample quantities on the parameters of a resonant cavity and microwave frequency, and to evaluate the feasibility of the system for measuring moisture in individual kernels.When electromagnetic wave and dielectrical body work mutualy, its energy consumption is connected with the size,shape and relative dielectrical constant of the body. While the moisture content of the body varies the wave frequency is shifted with it. Because relative dielectrical constant of water is different from that of most of the moisture-absorbed dielectrical materials, the effects of water and of dry dielectrical materials can be separated and ultimately, the relative moisture of dielectrical material, such as,soybean or grains can be measured.It was proved by the priliminary research that the microwave resonant cavity technique is a valuable tool to measure the soybean moisture of kernels. As measurement is done by measuring the shift properties of resonant frequency and coefficient of transfer, therefore,it does not require very high stability of the measuring system. The technique may also be used for the measurement of moisture of corn, wheat and other seed kernels.

关 键 词：湿度 微波谐振器 谷物 测量 贮藏 

分 类 号：S379.1[农业科学—农产品加工]