Characterization of 0.02-3 GHz Soil Dielectric Spectrum in 0-40 Deg. C. Temperature Range
Referat wygłoszony
| Status: | |
| Autorzy: | Lewandowski Arkadiusz, Szypłowska Agnieszka, Szerement Justyna, Kafarski Marcin, Wilczek Andrzej, Woszczyk Aleksandra, Majcher Jacek, Skierucha Wojciech |
| Rok wydania: | 2020 |
| URL do źródła | LINK |
| Język: | angielski |
| Źródło: | 2020 ASA-CSSA-SSSA International Annual Meeting "Translating Visionary Science to Practice" |
| Miasto wystąpienia: | Phoenix, Arizona |
| Państwo wystąpienia: | STANY ZJEDNOCZONE |
| Efekt badań statutowych | NIE |
| Abstrakty: | angielski |
| In-field monitoring of soil moisture content and salinity by means of non-invasive electromagnetic methods requires prior characterization of the relationship between soil complex dielectric-spectrum and soil physical and chemical properties. The state-of-the-art approach for such characterization employs broadband vector-network-analyzer (VNA) scattering-parameters measurement of a soil sample inserted into a large-diameter coaxial-transmission-line cell. The complex dielectric spectrum is then determined from scattering parameters based on modeling the cell as a transmission-line section filled with an unknown dielectric. In this work, we present a VNA-based system for the 0.02-3 GHz soil dielectric spectrum characterization under variable temperatures. Our system contains six separate channels for simultaneous measurement of six different soil samples. The system is placed into a climatic chamber and operated in the temperature range 0-40 degrees Celsius. To correct for the impact of the temperature on the VNA measurement accuracy, we employ a novel variable-temperature calibration technique. This technique allows us to separate out the impact of temperature on the measurement of the soil-filled coaxial cell. We validate our system based on measurements of polycarbonate samples and some known liquids. We then employ the system to characterize the temperature dependence of the dielectric spectrum of four soil samples of various moisture content. Results of our work may serve as a first step in the difficult task of establishing temperature-dependent models of soil dielectric spectrum. |
