194 festo didactic gmbh co kg fp 1110 11 physical

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Unformatted text preview: ed in sensor technology for the purpose of conveying light to inaccessible or particularly exposed areas, where there is no room for an emitter and/or receiver or where difficult environmental conditions prevail. The operation of an optical fibre is based on the total reflection of incoming radiated light inside the fibre. Fig. 11.4.7: Total reflection of light beams in the core of an optical fibre © Festo Didactic GmbH & Co. KG • FP 1110 193 11. Physical fundamentals In order to achieve total reflection, the high-refracting core is surrounded by a lowrefracting cladding. 1 dCore (1) 2 dCladding (2) Fig. 11.4.8: Principle of a fibre-optic cable There are three different types of fibre: – Step index, Multimode – Step index, Monomode – Gradient index, Multimode "Modes" refers to the particular forms of propagation of a light beam inside the fibre optic cable, which differ according to their individual direction of propagation. 194 © Festo Didactic GmbH & Co. KG • FP 1110 11. Physical fundamentals n r dCl t Input pulse AI nCl = const nC = n(r) c) nC t Output pulse nCl AO n(r) n dCl b)...
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