Kg fp 1110 11 physical fundamentals 112 fundamentals

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Unformatted text preview: onary objects. 164 © Festo Didactic GmbH & Co. KG • FP 1110 11. Physical fundamentals Material Relative dielectric constants Ethyl alcohol 25.1 Polyvinyle chloride 2.9 Methyl alcohol 33.5 Polyethylene 2.3 Glass 3 – 15 Polystyrene 3.0 Water 81 Transformer oil 2.2 – 2.5 Ice 4 Slate 6 – 10 Air 1 Brick 2.3 Hard rubber 3–4 Vaseline 2.1 – 2.3 Paper 1.2 – 3.0 Cable sealing compound 2.5 Paraffin 2.2 Oiled paper 5 Table 11.1.4: Relative dielectric constant of various materials © Festo Didactic GmbH & Co. KG • FP 1110 165 11. Physical fundamentals RC-resonant circuit An RC circuit is not capable of oscillation of its own accord. An active element is required in order to make up an oscillator. Circuits are often used which are similar to a Wien-Robinson oscillator. R2 C2 R1 R3 C1 R4 Fig. 11.1.6: RC resonant circuit For R1 = R2 = R and C1 = C2 = C, the resonant frequency of the RC-oscillator is ω = 1/RC 166 © Festo Didactic GmbH & Co. KG • FP 1110 11. Physical fundamentals 11.2 Fundamentals of magnetic proximity sensors With magnetism,...
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This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.

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