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Which optical sensor will be best for rotary encoders? Answered

I am trying to make an Optical Rotary Encoder please can anyone suggest that which optical sensor will be best for good resolution and accuracy...I have made one using Photo diode as receptor but the proble i am facing is that switching is not fast enough which results in a lot of error....so what can be done to make photo diode switch fast or should I use some other sensor(phototransistor or Photoresistor) and please do tell the reason...thank you..

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rickharris
rickharris

6 years ago

Depends on the resolution you need and the speed you intend to detect.

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iceng
iceng

6 years ago

Pin Photo Diodes are faster in reverse bias circuits then in the generation forward mode.

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steveastrouk
steveastrouk

6 years ago

Photo diodes are usually pretty fast, how fast are you counting ?

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Josehf Murchison
Josehf Murchison

6 years ago

Strip a printer they have exactly what you are looking for.

The one in the red square is from a rotary encoder from a printer.

It is an IR LED and a Phototransistor which tend to be faster and the plastic housing is slotted for a tight more accurate beam.

Joe

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