Study on soil water content measurement technique based on transmission line theory

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K18046
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Electron device/Electronic equipment
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Ito Hiroyuki 東京工業大学, 科学技術創成研究院, 准教授 (40451992)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: センサ技術 / IoT

Outline of Final Research Achievements

This work has studied sensor technology to measure water content of soil, improvement method of resolution and accuracy, and ion-concentration measurement technique for soil by exploiting frequency dependence of complex permittivity. We have proposed the new thin probe technique which uses interference between transmitted waves and reflected waves with soil influence. In our measurement, variation was 2.3% in the range of 20% to 35% water content. Measurements to improve accuracy and to consider influence of soil ions were conducted. The complex permittivity is hardly affected by fertilizer from 10GHz to 25GHz in our measurement.

Free Research Field

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