Variable Area Capacitance Displacement Sensor

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.

Variable area capacitance displacement sensor.

The capacitive transducer or sensor is nothing but the capacitor with variable capacitance. A transducer using the change in the area of plates. Capacitive displacement sensors are non contact devices capable of high resolution measurement of the position and or change of position of any conductive target. 2 variable area capacitive sensor.

They are also able to measure the thickness or density of non conductive materials. A variable capacitance sensor is constructed with its capacitance plates connected at their center. The capacitor transducers are used for the measurement of linear and angular displacement. Doing a simple calculation we can find out that for.

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. In the typical capacitor the distance between the two plates is fixed but in variable capacitance transducers the distance between the two plates. Capacitive displacement sensors are used in a wide variety of applications including semiconductor processing assembly of precision equipment such. The transducer using the change in distance between the plates.

This uses the concept of change of capacitance by a change in overlapping area and distance between the capacitor plates. The conducting surfaces forming the capacitor are insulated. The permittivity of the air is ε 0 8. 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.

854 10 12 f m. Applications for capacitive sensors. Capacitive transducer used to measure angular displacement. 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.

This post answers the question how capacitive displacement sensor works. Measuring displacement using capacitive sensor. A variable dielectric capacitive displacement sensor consists of two square metal plates of side 5 cm separated by a gap of 1 mm.