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There are two general types of capacitive displacement sensing systems. One type is used to measure thicknesses of conductive materials. The other type measures thicknesses of non conductive materials or the level of a fluid.
A capacitive sensing system for conductive materials uses a model similar to the one described above, but in place of one of the conductive plates, is the [[sensor]], and in place of the other, is the conductive target to be measured. Since the area of the probe and target remain constant, and the [[dielectric]] of the material in the gap (usually air) also remains constant, "any change in capacitance is a result of a change in the distance between the probe and the target."<ref name="LionCapTheory">[http://www.lionprecision.com/tech-library/technotes/cap-0020-sensor-theory.html Capacitive Sensor Operation and Optimization How Capacitive Sensors Work and How to Use Them Effectively] {{Webarchive|url=https://web.archive.org/web/20151202093819/http://www.lionprecision.com/tech-library/technotes/cap-0020-sensor-theory.html |date=2015-12-02 }}, An in depth discussion of capacitive sensor theory from Lion Precision.</ref> Therefore, the equation above can be simplified to:
:<math>C \propto \dfrac{1}{d} </math>
Where α indicates a proportional relationship.
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*[http://www.tectrends.com/cgi/showan?an=00174300 Medical Engineering ] - Patient Monitoring Using Capacitive Sensors
*[http://www.capacitance-sensors.com/capacitive_sensor_tutorial.htm Capacitive Sensors for Motion Control] - Tutorial on Capacitive Sensors for Nanopositioning Applications
*[http://www.lionprecision.com/tech-library/technotes/cap-0020-sensor-theory.html Capacitive Sensor Theory] {{Webarchive|url=https://web.archive.org/web/20151202093819/http://www.lionprecision.com/tech-library/technotes/cap-0020-sensor-theory.html |date=2015-12-02 }} - How Capacitive Sensors Work and How to Use Them Effectively
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