Design and Performance Analysis of Composite Sensor for Multilayer Soil Profile

Gao Zhitao, Liu Weiping, Zhao Y ong Zh

Abstract

Considering the many difficulties of installing the sensor for the soil temperature and moisture measurement, such as miserable installation of the sensor and relatively large disturbance to the local soil, this paper designed a composite sensor for multilayer soil profile in accordance with the principles of soil moisture measurement and temperature measurement based on SWR and platinum resistance. A vector network analyzer and HFSS electromagnetic simulation software were used to analyze impedance characteristic and electric field distribution of the sensor electrode. According to the analysis result, the structure of copper detection probe was designed. The diameter of the probe is 5cm, the width is 2.5cm, the thickness is 0.09cm and the excitation frequency of test circuit is 100MHz. Three types of soil were choosen as experimental samples. The polynomial fitting and linear fitting were conducted on the output values of sensor detection unit. The results correlation reached more than 099.The static and dynamic performance of the system met the detection requirements of temperature and moisture of soil profile. Experiments was carried out in Xiaotangshan District, Beijing City, and then effect of temperature and volumetric moisture content of soil on sensor outputs were analyzed and correction models were established by using the statistical regression method at different temperatures. The sensor working in the PVC pipe buried in the soil could obtain the information of temperature and moisture of the three layers, and its performance was stable and the data was reliable. This study provides a highly efficient method for obtaining the real time information of multilayer soil moisture and temperature.


Keywords: soil moisture, soil temperature, composite sensor, profile detection, performance analysis

 

Download Full Text:

PDF


References


Li Lianjun, Sun Yurui, Lin Jianhui. A wireless-sensor for soil water content powered by solar energy [ J ]. Journal of Jiangsu University; Natural Science Edition, 2009, 30(6) ; 541 -544. (in Chinese)

Kang S, Zhang J. Controlled alternate partial root-zone irrigation; its physiological consequences and impact on water use efficiency [J]. Journal of Experimental Botany, 2004, 407(55) ; 2437 -2446.

Hutton R J, Loveys В R. A partial root zone drying irrigation strategy for citrus-effects on water use efficiency and fruit characteristics[ J]. Agricultural Water Management, 2011 , 98( 10) : 1485 - 1496.

Hedley С В, Yule I J. A method for spatial prediction of daily soil water status for precise irrigation scheduling [J ]. Agricultural Water Management, 2009, 96( 12) : 1737 -1745.

Thompson R B, Gallardo M, Valdez L С, et al. Using plant water status to define threshold values for irrigation management of vegetable crops using soil moisture sensors[J]. Agricultural Water Management, 2007, 88( 1 -3) : 147 - 158.

Gao Xiaodong, Wu Pute, Zhao Xining, et al. Estimating the spatial means and variability of root-zone soil moisture in gullies using

measurements from nearby uplands[ J ]. Journal of Hydrology, 2013, 476( 1 ) ; 28 -41.

Sheng W, Sun Y, Lammers P S, et al. Observing soil water dynamics under two field conditions by a novel sensor system [J ]. Journal of Hydrology,2011 ,409( 1-2) :555 -560.

Li Xiaodong, Wu Yongfeng, Li Guanglin, et al. Development of wireless soil moisture sensor based on solar energy [ J ]. Transactions of the CSAE, 2010 ,26( 11 ) ; 13 - 18. (in Chinese)

Zhao Yandong, Ma Yangfei, Wang Yongzhi. Green land precision irrigation control system and analysis of optimal irrigation amount [J ]. Translations of the Chinese Society for Agricultural Machinery, 2012, 43(3) :46 -50. (in Chinese)

Steven R, Robert C, Joaquin J, et al. Soil water sensing for water balance, ET and WUE [ J ]. Agricultural Water Management, Zhao Yandong, Wang Yiming. Intelligent system of measuring the spatial distributions of Soil moisture [ J ]. Transactions of the Chinese Society for Agricultural Machinery, 2005,36(2) :76 -78. (in Chinese)

Peng Zengyu, Zhao Yandong. A monitoring system of real-time soil water content based on (СOS - П operating system [ J ]. Journal of Beijing Forestry University, 2010,32(6) :114 — 119. (in Chinese)

Dean T J, Bell J P, Baty A J B. Soil moisture measurement byan improved capacitance technique; part I. sensor design andperformance [ J ]. Journal of Hydrology, 1987 , 93 ( 1 ) : 67 -78.

Paltineanu I C, Starr J L. Real-time soil water dynamics using multi sensor capacitance probes; laboratory calibration [ J ]. Soil Science Society of America Journal, 1997 ,61 ( 6) ; 1576 - 1585.

Zhang Xueli, Hu Zhenqi, Chu Shili. Methods for measuring soil water content; a review [ J ]. Chinese Journal of Soil Science, 2005,36( 1 );118-121. (in Chinese)

Cai Kun, Yue Xuejun, Hong Tiansheng, et al. Design of soil water content sensor based on phase-frequency characteristics of RC networks[J]. Transactions of the CSAE, 2013 , 29 (7) ; 36 - 43. (in Chinese)

Ortuani B, Benedetto A, Giudici M, et al, A Non-invasive approach to monitor variability of soil water content with electromagnetic methods[J]. Procedia Environmental Sciences, 2013(19) ; 446 -455.

Cardenas-Lailhacar B, Dukes M D. Precision of soil moisture sensor irrigation controllers under field conditions[ J]. Agricultural Water Management, 2010, 97(5) ; 666 -672.

Zhao Yandong, Wang Yiming. Study on the measurement of soil water content based on the principle of standing-wave ratio[J]. Transactions of the Chinese Society for Agricultural Machinery, 2002,33(4) : 109 - 111 ,121. (in Chinese)

Hilhorst M A. Dielectric characterization of soil D]. Wageningen;Wageningen Agricltural University, 1998.

Topp G C, Davis J L, Annan A P. Electromagnetic determination of soil water content; measurements in coaxial transmission lines[J]. Water Recourse Research, 1980, 16(3): 574 -582.

He Shusen, Huang Muli. The application of micro-computer in the testing of field water depth [ J ] . Transactions of the Chinese Society for Agricultural Machinery, 1998, 29( 1 ) ; 130 - 135. (in Chinese)

Zhang Daohui, Zhao Hongjun, Zhou Guangfang,et al. Drift of the temperature-controlled instrument for the farm products storage [ J ]. Transactions of the Chinese Society for Agricultural Machinery,2010,41 (6) : 108 - 112. (in Chinese)

Zhao Yandong, Nie Mingjun. Optimal analysis for determining the dual-pin length of soil moisture probe[J]. Transactions of the Chinese Society for Agricultural Machinery, 2011 ,42( 11);39 — 43. (in Chinese)

Ma Daokun,Sun Yurui,Wang Maohua, et al. Three-dimensional numerical modeling of a four-pin probe for soil water content [ J ]. Australian Journal of Soil Research, 2006,44(2) : 183 — 189.


Refbacks

  • There are currently no refbacks.