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Measurement of the Solid Dielectric Permittivity of Clay Minerals and Granular Samples Using a Time Domain Reflectometry Immersion Method

Dep. of Plants, Soils, and Biometeorology, Utah State Univ., Logan, UT

View larger version (23K): [in a new window]   Fig. 1. Modeled effective permittivity (Eq. [2]) of a two-phase mixture plotted vs. the permittivity of the background solution. The unique crossing point occurs when the permittivity of the fluid matches the permittivity of the solid.

View larger version (118K): [in a new window]   Fig. 2. Photograph of the equipment specifically made for soil dielectric measurements: internal stainless-steel electrode 0.003175 m in diameter and 0.16 m in total length with 0.152 m projecting above the chemical resistant Delrin probe head at the base (A), outer brass tube, 0.156 m long with an internal diameter of 0.085 m (B), retaining nut fixing B to E (C), male connector (D), microwave electrical connector (E), coaxial cable (F), syringe assembly for mixing suspension (G), mixing rod (H), syringe used to draw fluid out of the coaxial cell (I). A similar syringe was used with a piece of Tygon tube to connect to G, to apply a tension to deair the suspension.

View larger version (21K): [in a new window]   Fig. 3. The solid permittivity of quartz and calcite determined using the immersion method.

View larger version (19K): [in a new window]   Fig. 4. The solid permittivity of biotite mica, phlogopite mica, and talc determined using the immersion method.

View larger version (32K): [in a new window]   Fig. 5. The predicted effective permittivity as a function of the quantity of entrapped air.

View larger version (20K): [in a new window]   Fig. 6. The effective permittivity of kaolin, illite, and montmorillonite used to determine solid permittivity.