Soil Moisture Monitoring System Based on Narrow Band Internet of Things

被引：0

作者：

Yang W. ^{[1
]}

Wang Y. ^{[1
]}

Yao Y. ^{[1
]}

Sai J. ^{[2
]}

机构：

[1] College of Information and Electrical Engineering, China Agricultural University, Beijing

[2] College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing

来源：

Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2019年 / 50卷

关键词：

Narrow band internet of things; Sensor; Sensor calibration; Soil moisture content; Temperature compensation;

D O I：

10.6041/j.issn.1000-1298.2019.S0.038

中图分类号：

学科分类号：

摘要：

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. © 2019, Chinese Society of Agricultural Machinery. All right reserved.

引用

页码：243 / 247

页数：4

共 18 条

[1]

Duan A., Meng Z., Present situation of techniques and equipments of monitoring crop water status, Journal of Agricultural Science and Technology, 9, 1, pp. 6-14, (2007)

[2]

Xiao W., Li X., Wang W., Et al., Advances in soil water content surveying research, Academic Annual Meeting of China Society of Agricultural Engineering, (2007)

[3]

Methods of Testing Soils for Engineering Purposes, (1977)

[4]

Wang Y.P.E., Lin X., Adhikary A., Et al., A primer on 3GPP narrow band internet of things (NB-IoT), IEEE Communications Magazine, 55, 3, pp. 117-123, (2016)

[5]

Angalvedhe N., Ratasuk R., Ghosh A., NB-IoT deployment study for low power wide area cellular IoT, 2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), (2016)

[6]

Adhikary A., Lin X., Wang Y.P.E., Performance evaluation of NB-IoT coverage, Vehicular Technology Conference, (2017)

[7]

Li J., Hong T., Feng R., Et al., High-frequency capactitive soil water content sensor based on detecting of true root mean square, Transactions of the CSAE, 27, 8, pp. 216-221, (2011)

[8]

Velazquez-Marti B., Gracia-Lopez C., Plaza-Gonzalez P.J., Determination of dielectric properties of agricultural soil, Biosystems Engineering, 91, 1, pp. 119-125, (2005)

[9]

Zhang Z., Xie Y., Yuan Z., Analysis of circuit characteristics of parallel resonant converter, Journal of South China University of Technology (Natural Science Edition), 41, 4, pp. 33-38, (2013)

[10]

Gao Z., Liu W., Zhao Y., Et al., Design and performance analysis of composite sensor for multilayer soil profile, Transactions of the Chinese Society for Agricultural Machinery, 47, 1, pp. 108-117, (2016)

← 1 2 →