研究目的
To describe the theory, design, and testing of a multi-frequency microwave cavity for measuring the complex permittivity of core plugs of rocks, consolidated soil, or sea ice.
研究成果
The multi-frequency core plug resonant cavity provides non-destructive measurements with high accuracy and low uncertainty, suitable for characterizing the complex permittivity of shales, soils, and ice samples. Future work will focus on geochemical characterization and expanding applications to soil and ice samples.
研究不足
Measurements at temperatures much higher/lower than room temperature need to be performed promptly after bringing the sample to temperature. The frequency range is higher than those available in literature, limiting comparison with existing data.
1：Experimental Design and Method Selection:
The study involves the design and testing of a multi-frequency resonant cavity for measuring the complex permittivity of cylindrical samples at five different frequencies between 1 GHz and
2：5 GHz. Sample Selection and Data Sources:
Core plugs of rocks, consolidated soil, or sea ice with commercially available diameter dimensions (
3：02 meters - 038 meters) and maximum height of 055 meters were used. List of Experimental Equipment and Materials:
The setup includes an ITACA multi-frequency resonant cavity, a Rohde & Schwarz (R&S) ZVA 50 vector network analyzer (VNA), a Gore VNA cable, a computer with the cavity software, and a power supply for the temperature sensor.
4：Experimental Procedures and Operational Workflow:
The VNA is calibrated, the cavity is connected, and measurements are taken with and without the sample inside the cavity. The ITACA software performs a coupling correction to calculate the permittivity.
5：Data Analysis Methods:
The software calculates the permittivity from the complex resonant frequency after performing coupling corrections.
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