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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 22 — Oct. 29, 2007
  • pp: 14601–14617

An optoelectronic measurement system for measuring 6-degree-of-freedom motion error of rotary parts

C. J. Chen, P. D. Lin, and W. Y. Jywe  »View Author Affiliations

Optics Express, Vol. 15, Issue 22, pp. 14601-14617 (2007)

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This paper presents an optoelectronic measurement system for measuring 6 degree-of-freedom (DOF) motion error of rotary parts. It comprises a pyramid-polygon-mirror, three laser diodes and three 2-axis position sensing detectors (PSD). The laser/PSD pairs are arranged evenly around the pyramid-polygon-mirror, which is mounted rigidly on and aligned axially with the rotary part to be measured. Laser rays from the laser diodes are reflected off the respective mirrors to the respective PSDs. The incidence point of the laser ray on the PSD’s surface varies with the pose of the pyramid-polygon-mirror, allowing the PSD to register variation in the mirror and, thereby, the rotary part. With appropriate orientation of the lasers and PSDs, this system can measure variation (error) during rotation of a rotary part. By use of skew-ray tracing and first order Taylor series expansion, the system achieves measurement of translational and rotational motion errors for each Cartesian axis. To validate the proposed methodology, a laboratory prototype system is built. System verification and stability tests are conducted to evaluate its performance. Stability test results show that measurement errors and maximum crosstalk are within ±1 μm in translation and ±1.5 arc sec in rotation.

© 2007 Optical Society of America

OCIS Codes
(080.2740) Geometric optics : Geometric optical design
(120.4570) Instrumentation, measurement, and metrology : Optical design of instruments
(120.4640) Instrumentation, measurement, and metrology : Optical instruments

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: August 23, 2007
Revised Manuscript: October 12, 2007
Manuscript Accepted: October 14, 2007
Published: October 19, 2007

C. J. Chen, P. D. Lin, and W. Y. Jywe, "An optoelectronic measurement system for measuring 6-degree-of-freedom motion error of rotary parts," Opt. Express 15, 14601-14617 (2007)

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