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Unformatted text preview: = Normally Closed) 72 © Festo Didactic GmbH & Co. KG • FP 1110 6. Optical proximity sensors 6.1.2 Construction of an optical proximity sensor
Optical proximity sensors basically consist of two main units: the emitter and the
receiver. Depending on type and application, reflectors and fibre-optic cables are
required in addition.
Emitter and receiver are either installed in a common housing (diffuse sensors and
retro-reflective sensors), or housed separately (through-beam sensors).
The emitter houses the source of red or infrared light emission, which according to
the laws of optics extends in a straight line and can be diverted, focussed,
interrupted, reflected and directed. It is accepted by the receiver, separated from
external light and electronically evaluated. 1 3 2 4 5 6 7 Transparent cover (1) Electronics (SMD-technology) (5) Shield (2) Brass sleeve (6) Potentiometer (3) Cable (7) Photoelectric modules (4) Fig. 6.1.2: Construction of an optical proximity sensor with cylindrical design The proximity s...
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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