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Related Experiment Videos

Precision goniometer equipped with a 22-bit absolute rotary encoder.

Z Xiaowei1, M Ando, W Jidong

  • 1Photon Factory, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba-shi 305, Japan.

Journal of Synchrotron Radiation
|July 21, 2004
PubMed
Summary
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Calibration of a precision goniometer revealed that bearing non-circularity limits angular accuracy. The 22-bit absolute rotary encoder

Area of Science:

  • Instrumentation and Measurement
  • Precision Engineering

Background:

  • Accurate angular positioning is critical in scientific instrumentation.
  • Compact goniometers require precise calibration for reliable data acquisition.

Purpose of the Study:

  • To calibrate a compact precision goniometer with a 22-bit absolute rotary encoder.
  • To evaluate the angular accuracy and identify limitations of the goniometer system.

Main Methods:

  • Modified Huber 410 goniometer utilizing a stepping-motor worm gear and piezoactuator tangent arm.
  • Angular accuracy assessed using an autocollimator.
  • 22-bit absolute rotary encoder calibrated against an incremental rotary encoder.

Main Results:

  • Deviation from circularity in the rolling bearing significantly restricts angular positioning accuracy.

Related Experiment Videos

  • Angular accuracy was found to be ten times larger than the 0.01 arcsec angular resolution.
  • The absolute encoder's accuracy was limited to approximately 18 bit due to systematic errors.

    • Conclusions:

    • Bearing non-circularity is a primary factor limiting the goniometer's angular accuracy.
    • Systematic errors affect the performance of the 22-bit absolute rotary encoder.
    • Further improvements in bearing design are necessary for enhanced goniometer precision.