杨卫中,王雅淳,姚瑶,赛景波.基于窄带物联网的土壤墒情监测系统[J].农业机械学报,2019,50(Supp):243-247.
YANG Weizhong,WANG Yachun,YAO Yao,SAI Jingbo.Soil Moisture Monitoring System Based on Narrow Band Internet of Things[J].Transactions of the Chinese Society for Agricultural Machinery,2019,50(Supp):243-247.
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基于窄带物联网的土壤墒情监测系统   [下载全文]
Soil Moisture Monitoring System Based on Narrow Band Internet of Things   [Download Pdf][in English]
投稿时间:2019-04-20  
DOI:10.6041/j.issn.1000-1298.2019.S0.038
中文关键词:  土壤墒情  传感器  窄带物联网  传感器标定  温度补偿
基金项目:国家重点研发计划项目(2017YFD0700603)
作者单位
杨卫中 中国农业大学 
王雅淳 中国农业大学 
姚瑶 中国农业大学 
赛景波 北京工业大学 
中文摘要:为了实时、准确监测土壤含水率,设计了一套基于窄带物联网的土壤墒情监测系统。系统探头采用圆环柱体结构,通过探头中分频器的输出频率测出土壤含水率,并对电容式土壤水分传感器进行了标定。利用恒温箱进行了环境温度对土壤含水率测量精度的影响分析,表明分频频率与温度呈现良好的线性关系,温度变化1℃,探头中分频频率变化0.1386kHz,从而得到温度补偿方程。在50.4~65.5℃和-18.0~23.6℃的环境中进行土壤含水率测量实验,结果显示,系统在较高温、较低温的环境下仍可以稳定、可靠运行。
YANG Weizhong  WANG Yachun  YAO Yao  SAI Jingbo
China Agricultural University,China Agricultural University,China Agricultural University and Beijing University of Technology
Key Words:soil moisture content  sensor  narrow band internet of things  sensor calibration  temperature compensation
Abstract:Moisture content is the most direct and necessary index to analyze and judge agricultural drought, realize water saving irrigation and hydrological forecast. In order to grasp the information of soil moisture content in time and accurately, a soil moisture monitoring system based on narrow band internet of things (NB-IoT) was designed. Circular cylinder was adopted by the probe of the system. The moisture content of soil was measured by the output frequency of the frequency divider in the probe, and the capacitive soil moisture sensor was calibrated. The calibration experiment of the sensor showed that the calibration curve adopted the cubic polynomial curve of the output frequency of the sensor, and the correlation was good, and the determination coefficient can reach 0.9851. The influence of environmental temperature change on the measurement accuracy of soil moisture content was analyzed with a thermostat, and the temperature change of 1℃ and the frequency division of the probe was 0.1386kHz, a first order linear equation was obtained to compensate the influence of ambient temperature on the frequency output of the sensor. Soil moisture content was measured at 50.4~65.5℃ and -18.0~23.6℃. The results show that the system can run stably and reliably at high temperature and low temperature.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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