Dissertation > Excellent graduate degree dissertation topics show

Study on Soil Moisture Sensor Based on High-Frequency Electric Field

Author: TangYang
Tutor: LiGuangLin
School: Southwestern University
Course: Agricultural Electrification and Automation
Keywords: Soil moisture Permittivity Electric field Sensor Microcontroller
CLC: S152.7
Type: Master's thesis
Year: 2010
Downloads: 146
Quote: 3
Read: Download Dissertation

Abstract


China 's shortage of water resources , agricultural production and water consumption , the study of soil moisture in the fast measurement technology, the reasonable irrigation , precision irrigation , and conservation of freshwater resources and improve crop yields has very important significance . In order to achieve the rapid detection of soil moisture , the existing methods and current status of measurements of soil moisture at home and abroad were analyzed. Contact point soil dielectric properties by theoretical analysis on soil dielectric properties , show that the dielectric constant to measure soil moisture is a high sensitivity , wide adaptation , less affected by the spatial variability of soil physical and chemical properties Quick measurement method. On the basis of analysis of capacitive sensor working principle to determine the the change media capacitive sensor research programs to a high - frequency electric field method - based soil moisture sensor . Hardware circuit design probes and sensors based on capacitive sensor model . Selection of active crystal as a signal source ; designed with high - frequency diode detector circuit ; prepared to the AT89C51 design micro-control system , system applications . The system combines data processing and results display function as one . Experimental study of the relationship of soil moisture content and source frequency capacitance measurement . Purple soil for the test , the sensor signal source frequency impact on soil moisture measurements , the capacitive sensor selection of the best test frequency of 100MHz . Drying method to measure the soil moisture value as a standard to measure the corresponding sensor probe output voltage signal , using the method of least squares regression analysis of the data , complete the calibration of the sensor . On the sensor accuracy, repeatability and stability test results showed that the sensor has a better accuracy, repeatability and stability , so that the sensor can be realized on real-time measurements of soil moisture .

Related Dissertations

  1. Research on Magnetic Field Sensor Based on GMI Effect and Geomagnetic Matching Algorithm,P318
  2. Soft Sensor of Naphtha Dry Point on Support Vector Machines Regression,TE622.1
  3. Research on the Integrated Grating Subdividing Digital Display Device Based on DSP,TH822
  4. High Speed Frequency Measurment and Non-Linearity Correction of Frequency Modulated Capacitive Displacement Sensor,TH822
  5. Research on Temperature Measurement Technique Based on CCD Image Sensor,TH811
  6. The Research of Navigation Multi-Sensor Data Fusion Technology Based on Micro Unmanned Platform,V249.32
  7. Research on the Image Acquisition System Based on CMOS Star Sensor,V448.2
  8. The Effect of Current Density and Electric Field on Ni and Its Alloy Electrodeposition for Copper Crystallizer,TQ153.2
  9. Research on Temprature Controling Technology of Laser Diode with Thermoelectric Cooler,TN248.4
  10. Design and Implement of Multi-Port Network Communication Platform,TN929.5
  11. Research on Intelligent Learning-Based Multi-Sensor Target Recognition and Tracking System,TP391.41
  12. Research on Joint Target Detection for Dual-Sensor Image and System Implementation,TP391.41
  13. Research on Spaceborne Hyperspectral Sensor Simulation,TP391.9
  14. Development of Experimental Robot Control System Based on ARM,TP242.6
  15. Gradual Event Detection in Sensor Networks,TP212.9
  16. Development of Inductance Sensor Data Acquisition System Based on FPGA,TP274.2
  17. Data Aggregation Scheduling Algorithms in Wireless Sensor Networks,TP212.9
  18. Multi-Sensor Information Fusion and Its Applications on Wearable Computer,TP202
  19. Research on Target Tracking and System in Wireless Sensor Networks Based on Character of Movement and Terrain Restriction,TP212.9
  20. Technology for Localization Attack Detection in Wireless Sensor Networks,TP212.9
  21. Multiple Pairwise Keys Management Protocol of Function Node-Based for Wireless Sensor Networks,TP212.9

CLC: > Agricultural Sciences > Agriculture as the foundation of science > Soil > Soil physics > Soil moisture
© 2012 www.DissertationTopic.Net  Mobile