摘要
采用自由空间微波透射技术对小麦的相对复介电常数进行了测量。同时,从电磁波透射探测法的基本原理出发,通过实验得到了小麦在1～8GHz探测频率下的介电常数和衰减因子值,并给出了介电常数和衰减因子各自随频率变化的规律,将实验结果和美国农业部(USDA)已发表的相应数据进行比较,误差小于4%,从而证明了所用测试方法的正确性和有效性。
This paper adopts microwave transmission method to measurement complex permittivity of wheat.The principle of the microwave transmission method is introduced.The dielectric constant and loss factor of wheat is measured between 1GHz and 8GHz detection frequencies.According to the experiment results,the regulation of complex permittivity with frequency is presented.The error between the experiment results and the publication data from USDA is less than 4%.
出处
《农机化研究》
北大核心
2010年第7期156-159,共4页
Journal of Agricultural Mechanization Research
基金
国家"十一五"科技支撑计划项目(2008BADA8B02)
关键词
微波测量
相对复介电常数
介电常数
衰减因子
microwave measurements
relative complex permittivity
dielectric constant
loss factor
