Whether you are an engineer or a consumer, many daily applications involve capacitance. Capacitance can be measured using a capacitor, however it is not as simple as that. There are three different methods in which the capacitor measures capacitance.
1.Displacement of Parallel Plates
- Diaphragm deflections is simplest way to change
the measure of capacitance, by varying the distance between electrode plates - This method measures the amount of energy that can be stored by the slight amount one electrode plate of the diaphragm deflects in response to changes in applied force
- The diaphragm can deflect inwards or outwards (opening/closing gap)
- Fun Fact: Setra uses this method by converting the change in capacitance into a linear analog output (voltage/current) for our pressure transducers
2. Change in Area- Shift in Electrode Plates
- Measures capacitance between two moving electrode plates
- As the plates move in separate directions, in respect to one another, the capacitance between the plates decreases
3. Change in Dielectric Material
- Dielectric material is an insulating layer
between the two conducting electrode plates - Dielectric material examples include solids and gases
- Can be used with displacement parallel plates or change in area
- Click here to view a dielectric constant chart
between the two conducting electrode plates
CLICK HERE to learn more about Setra’s Capacitance transducers.
