Lecture - 6 - Capacitance Transducers

Capacitance TransducersCapacitance is a function of effective area of conductor, the separation between the conductors and the dielectric strength of the Hisham El-SherifElectronics and Electrical Engineering DepartmentELCT903, S ensor TechnologyA change in Capacitance can be by varying any of the following parameters- Changing the distance between the two parallel electrodes. d- Changing the dielectric constant, permittivity, of the dielectric medium- Changing the area of the electrode. A eThe ratio of the amount of charge stored on one of the plates to the amount of voltage across the capacitor is the Hisham El-SherifElectronics and Electrical Engineering DepartmentELCT903, Sensor TechnologyThe Capacitance is directly proportional to the area of plates and inversely proportional to the distance between themdACe=The constant of proportionality is known as the permittivity is a function of the type of material separating the platesFor a Capacitance with insulating material, the Capacitance between the plates:-edACr0ee= Hisham El-SherifElectronics and Electrical Engineering DepartmentELCT903, Sensor Technology= dielectric constant of the insulating medium ( air = 1)= permittivity of air or free space ( X 10-12F/m)= overlapping area in plates m2= distance between electrodes or platesrere0eAdV

There is a linear relationship between displacement and the capacitance. The equations showed that: The capacitance is directly proportional to the area of the plates and varies linearly with changes in the displacement between the plates Transducers of this type are used for the measurement of relatively large Dr.-Eng. Hisham El-Sherif

Loading..

Tags:

  Linear, Transducer

Information

Related search queries