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Em3rgent0rdr (talk | contribs) →Basic capacitive theory: Capacitance is not "created by applying an electrical charge to two conductive objects with a gap between them", so deleting. (Readers can read the capacitor article if they want to know what capacitance is). Capacitance is also not capitalized. Shortening parallel plate description. |
Em3rgent0rdr (talk | contribs) →Basic capacitive theory: use ≈ instead of = because air's constant isn't quite exactly 1. |
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Due to this proportional relationship, a capacitive sensing system is able to measure changes in capacitance and translate these changes in distance measurements.
The operation of the sensor for measuring thickness of non-conductive materials can be thought of as two capacitors in series, with each having a different dielectric (and dielectric constant). The sum of the thicknesses of the two dielectric materials remains constant but the thickness of each can vary. The thickness of the material to be measured displaces the other dielectric. The gap is often an air gap, (dielectric constant
A sensor for measuring fluid levels works as two capacitors in parallel with constant total area. Again the difference in the dielectric constant of the fluid and the dielectric constant of air results in detectable changes in the capacitance between the conductive probes or plates.
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