are pointing in the same direction presented in fig9 is an isometric view of a classical capacitive displacement sensor element 500 it is composed of two conductive plates 501 and 502 on which a charge is applied and a dielectric material 503 between the two plates 501 and 502 the capacitance c of this element 500 can be expressed by where c is the capacitance u2208 0 is the known permittivity of free space constant k is the known dielectric constant of the material in the gap 503 a is the conjoint area of the plates 501 and 502 and d is the distance between the plates 501 and 502 hence it is possible with such sensor to compute the displacement in z direction that corresponds to variation in u2018 d u2019 in the previous equation by measuring the capacitance variation difference in u2018 c u2019 electronically fig1 shows how to use capacitive sensors to be able to measure displacement in more than one direction simultaneously multi axis measurement fig1 shows a sensor that is able to measure the displacement in two dimensions but this concept could be extended to more dimensions again the sensor is composed of two conductive plates 601 and 602 on which a charge is applied and a dielectric material 603 between.