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- Capacitance_probe abstract "Capacitance sensors (or Dielectric sensors) use capacitance to measure the dielectric permittivity of a surrounding medium. The configuration is like the neutron probe where an access tube made of PVC is installed in the soil; probes can also be modular (comb-like)and connected to a logger. The sensing head consists of an oscillator circuit, the frequency is determined by an annular electrode, fringe-effect capacitor, and the dielectric constant of the soil. Each capacitor sensor consists of two metal rings mounted on the circuit board at some distance from the top of the access tube. These rings are a pair of electrodes, which form the plates of the capacitor with the soil acting as the dielectric in between. The plates are connected to an oscillator, consisting of an inductor and a capacitor. The oscillating electrical field is generated between the two rings and extends into the soil medium through the wall of the access tube. The capacitor and the oscillator form a circuit, and changes in dielectric constant of surrounding media are detected by changes in the operating frequency. The capacitance sensors are designed to oscillate in excess of 100 MHz inside the access tube in free air. The output of the sensor is the frequency response of the soil’s capacitance due to its soil moisture level.".
- Capacitance_probe wikiPageID "13128582".
- Capacitance_probe wikiPageRevisionID "579381040".
- Capacitance_probe hasPhotoCollection Capacitance_probe.
- Capacitance_probe subject Category:Composite_materials.
- Capacitance_probe subject Category:Hydrology.
- Capacitance_probe subject Category:Measuring_instruments.
- Capacitance_probe subject Category:Physical_chemistry.
- Capacitance_probe subject Category:Soil_mechanics.
- Capacitance_probe subject Category:Soil_physics.
- Capacitance_probe type Artifact100021939.
- Capacitance_probe type Device103183080.
- Capacitance_probe type Instrument103574816.
- Capacitance_probe type Instrumentality103575240.
- Capacitance_probe type MeasuringInstrument103733925.
- Capacitance_probe type MeasuringInstruments.
- Capacitance_probe type Object100002684.
- Capacitance_probe type PhysicalEntity100001930.
- Capacitance_probe type Whole100003553.
- Capacitance_probe comment "Capacitance sensors (or Dielectric sensors) use capacitance to measure the dielectric permittivity of a surrounding medium. The configuration is like the neutron probe where an access tube made of PVC is installed in the soil; probes can also be modular (comb-like)and connected to a logger. The sensing head consists of an oscillator circuit, the frequency is determined by an annular electrode, fringe-effect capacitor, and the dielectric constant of the soil.".
- Capacitance_probe label "Capacitance probe".
- Capacitance_probe sameAs m.02z7sn3.
- Capacitance_probe sameAs Q5034478.
- Capacitance_probe sameAs Q5034478.
- Capacitance_probe sameAs Capacitance_probe.
- Capacitance_probe wasDerivedFrom Capacitance_probe?oldid=579381040.
- Capacitance_probe isPrimaryTopicOf Capacitance_probe.