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设计了一种水平放置管式结构的介电水分传感器测量系统,通过水平往复移动扫描,测量一定深度下水平剖面的土壤水分。水分传感器的测量原理为频域(FD)外缘场阻抗法,该系统实现了土壤水平剖面含水率的线扫描测量,其最大扫描长度为380 cm。为了检验该测量系统的技术性能与可应用性,结合农田滴灌试验给出了2个点源激励下土壤入渗的应用测试案例。试验结果显示了不同质地土壤的入渗差异并记录了点源激励下土壤入渗过程的时间、空间三维数据。
A horizontal tube-structured dielectric moisture sensor measuring system was designed to measure the soil moisture in a horizontal section at a certain depth by horizontal reciprocating scanning. The moisture sensor measures the frequency domain (FD) fringing field impedance method. The system realizes the line-scan measurement of moisture content in the soil horizontal section with a maximum scan length of 380 cm. In order to test the technical performance and applicability of the measuring system, the application test cases of soil infiltration under two point sources excitation are given in combination with the drip irrigation experiment in farmland. The test results show the infiltration differences of soils with different textures and record the three-dimensional data of time and space in soil infiltration process under the excitation of point sources.