The most commonly used emitter elements are

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Unformatted text preview: ngle of refraction is greater than the angle of incidence, the beam is refracted away from the vertical. 1 2 n = 1.0003 3 n = 1.000 n1 5 4 n = 1.0003 n2 ϑ4 ϑ4 ϑ3 ϑ2 ϑ5 ϑ3 ϑ2 ϑ1 Air (1) Substance 1 (2) Vacuum (3) Substance 2 (4) Air (5) Fig. 11.4.3: Refraction of light beams in various media 188 © Festo Didactic GmbH & Co. KG • FP 1110 11. Physical fundamentals 11.4.3 Total reflection With the transition from an optically dense medium into an optically thin medium, the angle of incidence cannot exceed a certain limit value. In the case of angles greater than this, total reflection occurs, i.e. the entire light energy is reflected into the optically dense medium. αg n1 n1 › n2 n2 α› αg α n1 n2 Fig. 11.4.4: Total reflection 11.4.4 Photoelectric components In optoelectronic proximity sensors, photoelectronic emitting components are used to create light emission and photoelectronic receiving components for receiving light emission. The most commonly used emitter elements are luminesc...
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