Volume 6 Issue 5
Oct.  2013
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PAN Nian, MA Wen-li. Error analysis and correction of scale tape grating encoder[J]. Chinese Optics, 2013, 6(5): 788-794. doi: 10.3788/CO.20130605.0788
Citation: PAN Nian, MA Wen-li. Error analysis and correction of scale tape grating encoder[J]. Chinese Optics, 2013, 6(5): 788-794. doi: 10.3788/CO.20130605.0788

Error analysis and correction of scale tape grating encoder

doi: 10.3788/CO.20130605.0788
  • Received Date: 21 Jul 2013
  • Rev Recd Date: 23 Sep 2013
  • Publish Date: 10 Oct 2013
  • To satisfy rigid performance specifications of goniometry for a telescope, this paper analyzes the impacts of the mechanical installation eccentric, roundness error and the shafting sloshing on angle measurements by an encoder with a scale tape grating, and develops a software subdivision angle measurement program based on 4 reading heads and 90 phase difference. The counterclockwise and clockwise angle measuring experiments are performed on a experimental platform with a mechanical installation eccentric of 10 m, roundness error of 2 m and shafting sloshing of 0.6. The measuring angle error RMS values from two sets of experiments are 0.393, 0.488, respectively. The experiments prove that the program can eliminate the angular measurement errors caused by the mechanical installation eccentric, machining roundness error and the shafting sloshing. It achieves arcsecond angle measurements.

     

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