Structure of an Absolute Encoder

The measuring system consists of a light source, a code
disc pivoted in a precision ball bearing and an opto-
electronic scanning device (see Image 1). A LED is used
as a light source which shines through the code disc and
onto the screen behind. The tracks on the code disk are
evaluated by an opto-array behind the reticle. With every
position another combination of slashes in the reticle is
covered by the dark spots on the code disk and the light
beam on the photo transistor is interrupted. That way the
code on the disc is transformed into electronic
signals.Fluctuations in the intensity of the light source are
measured by an additional photo transistor and another electronic circuit compensates for these. After the electronic signals are amplified and converted they are then available for evaluation.
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