摘要
土壤水分是现代精准农业中的重要检测对象,目前常用的土壤水分传感器大多使用高频测量方法,电路制作成本较高无法满足大范围布设的要求。基于土壤水分含量变化影响土壤介电常数的原理,设计了利用电导率特性进行校正的低频电容土壤水分传感器,详细介绍了传感器的原理、组成以及含水量计算混合模型,并将传感器应用于低盐度、低有机物含量的黄土土样中进行了重复测试。测试结果表明,传感器的最大误差小于3.30%,平均绝对误差小于2.0%,能够满足农业生产对土壤水分检测的精度要求。
Soil moisture is an important test object in modern precision agriculture. Most commonly used soil moisture sensors use high-frequency measurement methods,and the cost of circuit fabrication cannot meet the requirements of large-scale layout. Based on the difference of dielectric constant caused by the change of soil moisture content,the conductivity characteristics are designed to calibrate the capacitive soil moisture sensor in a low frequency. The principle,composition and water content calculation hybrid model are introduced in detail,and the sensors are applied to the low-salinity and low-organic content loess soil samples. The test results show that the maximum error of the sensor is less than3.30%,and the average absolute error is less than2.0%,which can meet the accuracy requirements of agricultural production for soil moisture detection.
作者
顾惠南
杨雷
邓霄
吕华芳
宋志强
潘丽鹏
张丽
崔丽琴
GU Huinan;YANG Lei;DENG Xiao;Lü Huafang;SONG Zhiqiang;PAN Lipeng;ZHANG Li;CUI Liqin(College of Physics and Optoelectronics,Taiyuan University of Technology,Taiyuan 030024,China;Key Lab of Advanced Transducers and Intelligent Control System,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;State Key Laboratory of Hydroscience and Engineering,Department of Hydraulic Engineering,Tsinghua University,Beijing100084,China)
出处
《传感技术学报》
CAS
CSCD
北大核心
2019年第5期784-789,共6页
Chinese Journal of Sensors and Actuators
基金
国家重点研发计划项目(2016YFC0402900)
国家自然科学基金项目(51809147
51641904
51809190
51205273)
山西省青年科技研究基金项目(2015021097)
国家留学基金项目(201508140062)
山西省研究生教育创新项目(2018SY020)
关键词
电容传感器
水分检测
电导率校正
低频
混合模型
capacitive sensors
moisture detection
conductivity correction
low frequency
mixed model
