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Unformatted text preview: ith reflecting surfaces. Devices with
sensing ranges of up to 500 mm are available. Luminescent sensors can also be
used in conjunction with fibre optic cables. 246 © Festo Didactic GmbH & Co. KG • FP 1110 15. Special designs and variants of proximity sensors 15.2.7 Angled light barrier sensors
An angled light barrier sensor is a through-beam sensor with an angled light
emission. The optical emitter and receiver are focussed on a common point. If an
object appears at this focal point, the receiver detects the light reflected by the
object and generates a switching signal.
Angled light barrier sensors are used for the accurate detection of objects at smaller
distances whereby in contrast to retro-reflective sensors the switching distance is
independent of the degree of reflection. 2 3 1
Emitter (1) Receiver (2) Object (3) Fig. 15.2.5: Angled light barrier sensor © Festo Didactic GmbH & Co. KG • FP 1110 247 15. Special designs and variants of proximity sensors 15.2.8 Sensors for accident preve...
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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