# If a non conductive or conductive material is

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Unformatted text preview: following formula applies: d= 1 π ⋅µr ⋅ µ 0 ⋅ κ ⋅f Whereby µ0 µr κ f = 1.257 ⋅ 10-6 Vs/Am = Magnetic field constant = Relative permeability = Conductivity = Frequency It can be seen that the greater the permeability and the conductivity of the material, the smaller the penetration depth. If the material thickness of the object being detected by an inductive proximity sensor is less than the penetration depth of the field, then a part of the field is outside the plate, thus resulting in greater switching distances. Materials Penetration depth [mm] Copper 0.073 Aluminium 0.094 Brass 0.16 Table 11.1.3: Field penetration depths at a frequency of f = 800 kHz © Festo Didactic GmbH & Co. KG • FP 1110 163 11. Physical fundamentals 11.1.2 Capacitive proximity sensors The active element of a capacitive proximity sensor consists of a capacitor, which is made up of a disc-shaped metallic electrode and a beaker-shaped half-open metallic shield. If a non-conductive or conductive material is introduced into the active zone in front of the sensor, capacity C of the ca...
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