Analysis of Sensitivity of Soil Moisture Measurement Based on Standing-Wave Ratio

With the development of study on measurement of soil moisture, sensitivity of measurement becomes more and more important. In this paper, the theory of electrostatic field was applied to analyze the sensitivity of soil moisture measurement by using its sensor based on standing wave ratio, which was manufactured by Electrical Information College of China Agricultural University. The effective measurement of soil volume and the best structure of sensor's probe were presented, and the linear range between voltage and soil moisture was obtained.