Comparison of Standing Wave Ratio, Time Domain Reflectometry and Gravimetric Method for Soil Moisture Measurements
In this paper, we presents a new soil moisture sensor that is based on SWR (Standing Wave Ratio) theory which is a different dielectric property method from TDR (Time Domain Reflectometry) tech-nique. To test the performance of SWR sensor, we made a comparative experiment of SWR sensor and TDR sensor. A series of soil cylinders of specific gravimetric soil moisture were made in the laboratory. The volumetric soil moisture of soil cylinders was measured with SWR sensor and TDR sensor, meanwhile, the real soil moisture of soil cylinders was determined by gravimetric method. The experiments used loam and sandy soil. An analysis of the data gathered in the experiment shows that SWR sensor and TDR sensor both have a high measurement precision compared with gravimetric results, but soil type influence of SWR sensor in sandy soil is a little higher than TDR sensor. As a relatively simple and low-cost sensor, the precision of SWR sensor is high enough to satisfy the requirement of practical application.
Soil Moisture SWR TDR Gravimetric Method
Lei Feng Yiming Wang Weizhong Yang Qinglan Shi
College of Information and Electrical Engineering, China Agricultural University, Beijing, 100083, P. R. China
国际会议
南昌
英文
1140-1143
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）