| 摘要 |
A sensor is provided for testing a porous medium using time-domain reflectometry. The sensor includes an inner conductor, an outer conductor and a ceramic material interposed there-between. The inner conductor runs along a longitudinal axis of the sensor. The outer conductor has a hollow axial interior and is oriented around the inner conductor. The ceramic material is solid, porous, exhibits a known liquid release curve and fills an axial gap between the inner and outer conductors. A dielectric substance can be applied to an exterior surface of the inner conductor to enable the testing of a porous medium which is highly dissipative. The inner conductor can be permeable and have a hollow axial interior. A hydrophobic material can also be interposed between the inner and outer conductors.
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