Variable Area Capacitance Displacement Sensor

In the variable area type capacitive sensor taking the parallel plate capacitor as an example when the upper plate moves the relative coverage area between the two plates changes thereby causing a change in capacitance.

Variable area capacitance displacement sensor.

The change in capacitance producted by a displacement in response to supplied pressure or force is increased by maximizing the displacement at peripheral regions having the largest area. This post answers the question how capacitive displacement sensor works. A transducer using the change in the area of plates. 854 10 12 f m.

A sheet of dielectric material 1 mm thick and of the same area as the plates can be slid between them as shown in the figure. 2 variable area capacitive sensor. Measuring displacement using capacitive sensor. The permittivity of the air is ε 0 8.

They are also able to measure the thickness or density of non conductive materials. This uses the concept of change of capacitance by a change in overlapping area and distance between the capacitor plates. A variable capacitance sensor is constructed with its capacitance plates connected at their center. Applications for capacitive sensors.

For the measurement of object displacement one plate of the capacitance transducer is kept fixed while the other plate is connected to the object. The transducer using the change in distance between the plates. Doing a simple calculation we can find out that for. Such sensors can be used for displacement measurements.

The capacitive transducer or sensor is nothing but the capacitor with variable capacitance. Capacitive displacement sensors are non contact devices capable of high resolution measurement of the position and or change of position of any conductive target. Capacitance of a parallel plates capacitor is determined by the formula c ε a d where a is the plate square d is a distance between plates and ε is a permittivity of the material between the plates. Capacitive transducer used to measure angular displacement.

The capacitive transducer comprises of two parallel metal plates that are separated by the material such as air which is called as the dielectric material. Capacitive displacement sensors are used in a wide variety of applications including semiconductor processing assembly of precision equipment such. In the typical capacitor the distance between the two plates is fixed but in variable capacitance transducers the distance between the two plates.