E it does not recognise the object one solution to

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Unformatted text preview: example, can be 150 µs and parts of up to 2 mm in diameter can be resolved. 242 © Festo Didactic GmbH & Co. KG • FP 1110 15. Special designs and variants of proximity sensors 15.2.3 Laser barrier sensors Light emitting diodes (LED) are mostly used as the light source for optical sensors. However, by using laser diodes, it is possible to construct laser sensors, which have the following advantages: • Extremely wide range by means of concentrating the laser beams • Very narrow and precise response range over great distances With laser beams having a cross section of 18 mm x 10 mm, it is possible to detect objects at ranges of more than 200 m for instance. With shorter ranges of for example 2 m, it is possible to detect an object of only 0.3 mm diameter. Such extremely small response areas are particularly useful for accurate approaching and setting of tools and workpieces. 15.2.4 Polarised retro-reflective sensors Where retro-reflective sensors are used to detect highly reflective objects, the proximity sensor is unable to distingui...
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