基于电容法的表层土壤水分传感器设计与性能分析
Design and Performance Analysis of Top Soil Moisture Measurement Device Based on Capacitance Method
高志涛 1周志明 1孙文昊 1王伟 2唐鹏飞 1饶栢霖1
作者信息
- 1. 防灾科技学院电子科学与控制工程学院,河北 廊坊 065201
- 2. 防灾科技学院地质工程学院,河北 廊坊 065201
- 折叠
摘要
针对表层土壤水分测量速度慢效率低等问题,设计一种基于电容法的表层土壤水分传感器.区别于传统的插入式测量方式,设计并制作出共面交指型电容探头,实现表层土壤水分的快速测量.以河北廊坊地区的沙壤土作为实验样土,通过多项式拟合对传感器输出值进行标定,决定系数达到了0.981 77,传感器的动态响应、稳定性以及灵敏度试验均能满足监测要求.分析环境温度变化对传感器输出的影响,对传感器输出结果与温度进行线性拟合,决定系数为0.984 57.进一步测量传感器的测量敏感区域Ke,通过试验的方式确定了其纵向影响范围为4 cm.与TRIME-PICO64型插入式土壤水分传感器对比实验结果表明,设计的传感器与国外类似产品在性能上相当,但具有更高的性价比.最后通过对比实验分析得出,设计的土壤水分传感器能够实现土壤表层水分的快速测量,可有效解决表层土壤流动水分测量效率低的问题.
Abstract
A capacitive-based surface soil moisture sensor is designed to address the issues of slow speed and low efficiency in surface soil moisture measurement.Unlike traditional insertion-based measurement methods,a co-planar inter-digitated capacitive probe is designed and fabricated to achieve rapid measurement of surface soil moisture.Sandy loam soil from the Langfang area of Hebei Province was used as the experimental soil sample.The sensor output values were calibrated using polynomial fitting,achieving a determination coefficient of 0.981 77.The dynamic response,stability,and sensitivity tests of the sensor meet the monitoring requirements.The impact of environmental temperature changes on the sensor output is analyzed,and a linear fit between the sensor output and temperature was determined with a determination coefficient of 0.984 57.Furthermore,the sensitive measurement area of the sensor is determined through experimental testing,and its longitudinal influence range is found to be 4 cm.Comparative experiments with the TRIME-PICO64 insertion type soil moisture sensor show that the performance of the designed sensor is comparable to that of similar foreign products but has a higher cost-effectiveness.Finally,through comparative experiments and analysis,the designed soil moisture sensor is concluded to enable rapid measurement of surface soil moisture and effectively solve the problem of low efficiency in measuring flowing water in surface soil.
关键词
土壤水分/传感器/电容法Key words
soil moisture/sensor/capacitance method引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
维普
万方数据