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A new compensation method that can greatly reduce the slit errors (i.e., transition location errors) due to nonidealities in optical incremental encoders caused by manufacturing limitations in the code wheel, optical components, and analog circuitry is presented. An M/T-type constant sample-time digital tachometer (CSDT), which involves pulse-count and high-frequency timer measurement, effectively...
A novel compensation method to greatly reduce the slit errors (i.e. code wheel errors) that are caused by non-idealites in optical incremental encoders is proposed in this paper. Manufacturing limitations in the code wheel, optical components and analog circuitry hinder the use of cheaper encoders for high-end applications. To measure the shaft velocity, the M/T-type constant sample-time digital tachometer...
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