基于超表面透镜天线的小麦含水量微波检测系统设计

Microwave Detection System for Wheat Moisture Content Based on Meta-surface Lens Antenna

控制小麦含水量在安全范围内对小麦品质安全具有重要意义,而对小麦含水量的高精度快速检测是决定控制过程实施的关键因素。提出了一种基于超表面透镜天线的小麦含水量微波检测系统,能够对小麦含水量实现高精度、无损和非接触检测。该系统测量不同含水量小麦在23.5~24.5 GHz的衰减变化特性,通过与标准干燥法测得的小麦实际含水量建立线性回归方程(决定系数R^(2)=0.9946)作为小麦含水量的预测模型。选取72份小麦样本进行含水量预测,预测结果的均方根误差(Root Mean Square Error,RMSE)为0.193%,平均绝对误差(Mean Absolute Error,MAE)为0.16%,最大相对误差(Maximum Relative Error,MRE)为5.25%。结果表明,提出的基于超表面透镜天线的微波检测系统是检测小麦含水量的有效方法。

Controlling the wheat moisture content within a safe range play a great importance in wheat quality safety,the high precision and rapid detection of wheat moisture content is a key factor in determining the implementation of the control process.A microwave moisture content detection system for wheat based on a meta-surface lens antenna is proposed,which can achieve high accuracy,non-destructive and non-contact detection of wheat moisture content.The attenuation variation characteristics of wheat with different moisture contents in the frequency range of 23.5 GHz to 24.5 GHz is measured,and a linear regression equation(coefficient of determination R^(2)=0.9946)with the actual wheat moisture content measured by the standard drying method is established as a prediction model for the wheat moisture content.72 wheat samples are selected for moisture content prediction and the Root Mean Square Error(RMSE)of the prediction results is 0.193%,Mean Absolute Error(MAE)is 0.16%,and Maximum Relative Error(MRE)is 5.25%.The results show that the proposed microwave detection system based on the meta-surface lens antenna is an effective method to detect the wheat moisture content.