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Improvised Long Test Lengths via Stitching Scale Bar Method: Interim Testing of Laser Trackers.

Vincent D Lee1, Daniel Sawyer1, Bala Muralikrishnan1

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.

Journal of Research of the National Institute of Standards and Technology
|September 23, 2024
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Summary

This study investigates if a shorter, 1.15-meter scale bar can effectively test laser tracker systems (LTSs) by simulating a 2.3-meter length. Findings suggest this shorter artifact can sufficiently expose LTS inaccuracies.

Keywords:
interim testinglaser scannerslaser tracker systemsscale bar

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Area of Science:

  • Metrology and Measurement Science
  • Optical Engineering and Instrumentation

Background:

  • International Standards Organization (ISO) and American Society of Mechanical Engineers (ASME) standards mandate calibrated length artifacts of 2.3 m or more for laser tracker system (LTS) performance verification.
  • Previous research (NIST IR 8016) indicated a 1.15 m spaced scale bar could expose LTS errors when used symmetrically for a 2.3 m test length.

Purpose of the Study:

  • To evaluate the efficacy of a 1.15 m scale bar in sufficiently exposing laser tracker system (LTS) errors when its length is combined to create a 2.3 m test length.
  • To determine if a shorter artifact can meet the performance verification requirements for LTSs.

Main Methods:

  • Utilizing a 1.15 m scale bar to create a stitched 2.3 m test length for LTS performance verification.
  • Comparing the error detection capabilities of the 1.15 m scale bar against established 2.3 m artifact standards.

Main Results:

  • The 1.15 m scale bar, when stitched to form a 2.3 m length, demonstrated sufficiency in exposing LTS inaccuracies.
  • The results indicate that shorter artifacts can be viable for LTS performance verification.

Conclusions:

  • A 1.15 m scale bar is a viable alternative for creating a 2.3 m test length for LTS performance verification.
  • This approach offers a potentially more practical and cost-effective method for ensuring LTS accuracy.