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Capacitance Sensors use capacitance to measure the dielectric permittivity of the surrounding medium. The volume of water in the total volume of soil most heavily influences the dielectric permittivity of the soil because the dielectric of water (80) is much greater than the other constituents of the soil (mineral soil: 4, organic matter: 4, air: 1). Thus, when the amount of water changes in the soil, the probe will measure a change in capacitance (from the change in dielectric permittivity) that can be directly correlated with a change in water content. Circuitry inside the probe changes the capacitance measurement into a proportional millivolt output.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Capacitance_probe". A list of authors is available in Wikipedia.|