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Optical proximity sensors 2 1 emitterreceiver 1

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Unformatted text preview: LED display to facilitate reliable setting, which flashes if the sensing object is not clearly detected. The adjustment of a proximity sensor with normally open output should be made in such a way that the light emitting diode is on in the active status without flashing. Behaviour of a diffuse sensor with a mirroring object 1 Emitter/Receiver (1) 2 Reflecting surface (2) Fig. 6.4.4: Object is detected © Festo Didactic GmbH & Co. KG • FP 1110 89 6. Optical proximity sensors 2 1 Emitter/Receiver (1) Reflecting surface (2) Fig. 6.4.5: Object is not detected Transparent objects – Light glass – Light plexiglass – Transparent cling film These materials usually have smooth, reflecting surfaces and a diffuse sensor can therefore be used. Condition: The surface of the object must be vertically aligned to the direction of the light beam. Objects with reduced reflection – – – – – Matt black plastic Black rubber Dark materials with a rough surface Dark textiles Burnished steel Diffuse sensors do not react to this type of material or only at a very small distance. Alternative solutions 90 • Through-beam sensors or retr...
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