基于电阻法针刺式在体玉米水分测量仪的设计

Design of needle-punched in-situ corn moisture meter based on resistance method

目前我国对玉米水分测量的研究多集中于脱粒后玉米籽粒的水分测量,对于田间在体玉米籽粒的水分判定还主要依赖人工生产经验,针对这一现状,本文研究田间在体玉米籽粒电阻与含水率和温度之间的函数关系模型,设计一种手持探针刺入式玉米籽粒水分测量仪,实现对田间在体玉米籽粒的水分测量,对实时监测田间玉米水分提供参考。试验结果表明,该水分测量仪对田间在体玉米籽粒的水分测量准确率高,模型拟合度大于0.9,水分测量仪单次测量响应时间不大于1.5 s,能够满足田间玉米籽粒水分测量的要求。

At present,the research on moisture measurement of maize in our country is mostly focused on the measurement of maize grain after threshing,and the moisture determination of maize grain in the field mainly depends on the experience of artificial production.In view of this situation,this paper studies the functional relationship model between resistance of maize grain in situ in the field and moisture content and temperature,and designs a hand-held probe penetrating moisture grain moisture meter,it can measure the moisture of maize grain in situ in the field and provide reference for real-time monitoring of maize moisture in the field.The experimental results show that the moisture meter has a high accuracy in measuring the moisture content of maize grains in the field.The fitting degree of the model is more than 0.9,and the response time of the moisture meter is less than 1.5 s,which could meet the requirement of measuring the moisture content of maize grains in the field.