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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
– Matt black plastic
Dark materials with a rough surface
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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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.
- Spring '12