Self-calibration for Precision Encoders
نویسندگان
چکیده
INTRODUCTION Angular encoder accuracy is often the key limiting factor in rotational metrology systems. Inconsistent spacing of the graduations and spindle error motion are major sources of encoder error. Through calibration, the repeatable components of encoder error can be eliminated. Calibration systems have been developed to measure the error map at 128 angular intervals, achieving 0.01" (arc-sec) measurement uncertainty at [1]. Another method using five evenly distributed scanningheads, self-calibrated graduation errors except 5th order harmonic multiples [2].
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