Design of soil moisture distribution sensor based on high-frequency capacitance

Authors

  • Yan Hua College of Water Conservancy and Civil Engineering，China Agricultural University;National Engineering Research Center for Information Technology in Agriculture
  • Tang Zejun College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China
  • Xing Zhen National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China
  • Gao Dingneng College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, China
  • Hong Haoxing National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China

DOI:

https://doi.org/10.25165/ijabe.v9i3.2226

Keywords:

high frequency capacitance detection, profile, soil moisture sensor

Abstract

In order to obtain accurate real-time soil moisture data and the spatial distribution of soil moisture, the soil moisture measurement methods based on high-frequency capacitance edge field effect were analyzed, the structure of probe was studied, and a multi-channel soil moisture sensor was designed. Moreover, with the established two-dimensional trace planar capacitance probe model and the method of the finite element analysis, relationship between the structure of sensor probe and electric field intensity was studied and capacitance of the probe trace amount planar capacitance model was analyzed, the most optimal structure of sensor probe was determined. Design parameters of the probe which can achieve optimal sensitivity and detection range are: outer diameter 40 mm and inner diameter 38.4 mm for the probe copper ring electrode, axial length 20 mm and axial spacing 10 mm. The sensor is suitable for measuring the moisture of different type of soil. Moreover, the features of the profile soil moisture sensor were experimentally explored. The measurement accuracy reached ±1.31% with better stability and consistency. Sensor probes can be assembled according to the measurement depth and used to measure soil moisture of different crop root zone. Keywords: high frequency capacitance detection, profile, soil moisture sensor DOI: 10.3965/j.ijabe.20160903.2226 Citation: Yan H, Tang Z J, Xing Z, Gao D N, Hong H X. Design of soil moisture distribution sensor based on high-frequency capacitance. Int J Agric & Biol Eng, 2016; 9(3): 122－129.

Author Biography

Yan Hua, College of Water Conservancy and Civil Engineering，China Agricultural University;National Engineering Research Center for Information Technology in Agriculture

Associate Professor, research interest: agricultural information, Email: yanh@nercita.org.cn.

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Published

2016-05-31

How to Cite

Hua, Y., Zejun, T., Zhen, X., Dingneng, G., & Haoxing, H. (2016). Design of soil moisture distribution sensor based on high-frequency capacitance. International Journal of Agricultural and Biological Engineering, 9(3), 122–129. https://doi.org/10.25165/ijabe.v9i3.2226

Issue

Vol. 9 No. 3 (2016): IJABE

Section

Information Technology, Sensors and Control Systems

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