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Unformatted text preview: mp; Co. KG • FP 1110 97 6. Optical proximity sensors 6.5.4 Examples of application Fig. 6.5.9: Detecting small objects by means of a diffuse sensor with fibre-optic cables 98 © Festo Didactic GmbH & Co. KG • FP 1110 6. Optical proximity sensors Fig. 6.5.10:
Distinguishing between one or two layers of fabrics by means of a through-beam sensor with fibre-optic cable One layer of fabric lets through more light than two, which leads to switching with an
appropriate proximity sensor setting. Fig. 6.5.11: Checking of threads Threaded screws reflect sufficient diffused light to make the receiver switch. If the
surface is smooth, the emitted light beam is deflected away from the sensor. © Festo Didactic GmbH & Co. KG • FP 1110 99 6. Optical proximity sensors 1
a b 2 Workpiece (1) Workpiece carrier (2) Through-beam sensor with fibre-optic cable (a – b) Fig. 6.5.12: Detection of workpieces on a workpiece carrier 6.6
Exercises Exercise 6.1 Environmental effects on optical proximity...
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- Spring '12