Pepperl+Fuchs - Rotary encoders
In automation, rotary encoders are used as sensors for angle, position, speed and acceleration. By the use of spindles, gear racks, measuring wheels or cable pulls, linear movements can also be monitored.
They convert the actual value of a mechanical parameter into electrical signals which can be processed by counters, tachometers, programmable logic controllers and industrial PCs.
Transparent and non-transparent fields are applied to a disk made of glass or plastic. If a light source is fitted on one side of the disk and a light sensitive sensor on the other side, the rotary movement is picked up contactless.
If a light beam hits a transparent field, the receiver recognises a pulse. If, however, the beam is interrupted by a dark field, no pulse is released.
Light-emitting diodes which emit light in the infrared range are usually used as a light source. Photodiodes or phototransistors are used as receivers.
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