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Abstract

 

This article in SSSAJ

  1. Vol. 76 No. 6, p. 1987-1991
     
    Received: Feb 22, 2012
    Published: October 19, 2012


    * Corresponding author(s): shengwenyi@cau.edu.cn
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doi:10.2136/sssaj2012.0063n

A Novel Method to Determine the Volume of Sensitivity for Soil Moisture Sensors

  1. Yurui Suna,
  2. Wenyi Sheng *a,
  3. Qiang Chenga,
  4. Jin Chaia,
  5. Yuliang Yunb,
  6. Yandong Zhaoc,
  7. Xuzhang Xued,
  8. Peter Schulze Lammerse,
  9. Lutz Damerowe and
  10. Xiang Caif
  1. a College of Information and Electrical Engineering, China Agricultural Univ. 100083 Beijing, China
    b College of Mechanical and Electrical Engineering, Qingdao Agricultural Univ. 266109 Qingdao, China
    c School of Technology, Beijing Forestry Univ. 100083 Beijing, China
    d National Research Center of Intelligent Equipment for Agriculture, 100083 Beijing, China
    e Dep. of Agricultural Engineering Univ. of Bonn, 53115 Bonn, Germany
    e Dep. of Agricultural Engineering, Univ. of Bonn, 53115 Bonn, Germany
    f College of Information and Electrical Engineering, China Agricultural Univ., 100083 Beijing, China

Abstract

This study presented a novel method to determine the volume of sensitivity (VOS) for dielectric sensors by frozen soil columns radially thawing from outside inward. The method is based on physical equivalence of the dielectric properties between soil drying–wetting and freezing–thawing transitions. We applied this method to determine/compare (i) the VOSs of two types of fringe field probes (one tube type and one cone type) with sandy silt loam samples at a middle level of soil moisture content (θv = 0.20 cm3 cm−3), (ii) the VOSs of the cone-type probe with sandy silt loam samples at three levels (θv = 0.10, 0.20, and 0.28 cm3 cm−3), and (iii) the VOSs of the tube-type probe with three soil textural samples (sand, sandy silt loam, and silty clay). The determined radii of the cone-type sensor ranged from 3.0 to 4.1 cm and those of the tube-type sensor from 5.1 to 8.5 cm. These results could be beneficial for improving the technical design of soil dielectric sensors and understanding the effect of soil physical properties on the VOS.

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Copyright © 2012. Copyright © by the Soil Science Society of America, Inc.