E1 b e2 r2 e1 a r1 r1 r2 e2 a problem mutual

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Unformatted text preview: sharp knife. • Cost saving. Advantages of glass fibre-optic cables • Suitable for higher temperatures. • Reduced optical attenuation with large distances as well as at close infrared range. • Longer lasting. 94 © Festo Didactic GmbH & Co. KG • FP 1110 6. Optical proximity sensors If emitter/receiver units with separate housing (as with through-beam sensors) are used, it should be noted that if several sensors are similarly orientated, mutual interference can occur. E1 b) E2 R2 E1 a) R1 R1 R2 E2 a) Problem: Mutual interference of emitter and receiver b) Solution: Alternate arrangement of emitter and receiver Fig. 6.5.6: Avoiding mutual interference © Festo Didactic GmbH & Co. KG • FP 1110 95 6. Optical proximity sensors Although optical proximity sensors are to a certain extent protected against external light influences, excessive external light (e.g. filming lights, flash lights, strong sunlight) can cause interference. Problem: Interference from extraneous ligh...
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