2010 Fiscal Year Final Research Report
Extension and functional properties for TDR measurement application
| Project/Area Number |
20580265
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Irrigation, drainage and rural engineering/Rural planning
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| Research Institution | Kyushu University |
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Principal Investigator |
筑紫 二郎 Kyushu University, 生物環境調節センター, 教授 (00127458)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Yuji 佐賀大学, 低平地沿岸海域研究センター, 研究機関研究員 (60526911)
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| Project Period (FY) |
2008 – 2010
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| Keywords | TDR / 誘電率 / 電気伝導度 / 電磁波パルス / マイクロ波 / 淡塩境界面 / 校正曲線 |
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| Research Abstract |
The purpose of the present study was to establish new applications of TDR measurement and to clarify their functional properties. In this report, three major research topics are included. (1) A multi TDR probe (MWP), having 8 probes in the electric board of 3-cm wide, was developed and properties of the MWP were investigated to measure water content profile near soil surface. The measurements of the profile conducted during evaporation process for sand and decomposed granite soil by using the MWP revealed clear difference of the profile between the soils. (2) Applicability of TDR technique to the monitoring of soil deposit level in water reservoir. A linear relationship between dielectric constant and the deposit level was found with minor impact of electrical conductivity of water. (3) The detection of boundary between fresh- and salt-water using TDR was examined. The analysis of TDR wave form made it possible to estimate the boundary level with high accuracy. With the measurement, we also found that the electrical conductivity of the fresh water can be also evaluated.
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