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



Vincent Lee, Daniel S. Sawyer, Balasubramanian Muralikrishnan


Performance verifications of laser tracker systems (LTSs) often rely on calibrated length artifacts that are 2.3 m in length or more, as specified in International Standards Organization (ISO) and American Society of Mechanical Engineers (ASME) standards. The 2.3 m length is chosen as the minimum length that will sufficiently expose inaccuracy in LTSs. Embodiment of these artifacts often comes in the form of scale bars, fixed monuments, or a laser rail. In National Institute of Standards and Technology (NIST) Internal Report (IR) 8016, which was published in 2014 and discusses interim testing of LTSs, it was shown that a scale bar with three nests spaced 1.15 m apart was sufficient for exposing errors in LTSs. In that case, the LTS was placed symmetrically with respect to the scale bar so that both a 2.3 m symmetrical length and a 1.15 m asymmetrical length were presented to the LTS. This paper will evaluate whether a scale bar that is only 1.15 m in length can sufficiently expose errors within the LTS when it is stitched together to create a 2.3 m long test length.
Journal of Research (NIST JRES) -


interim testing, laser scanners, laser tracker systems, scale bar


Lee, V. , Sawyer, D. and Muralikrishnan, B. (2020), Improvised Long Test Lengths via Stitching Scale Bar Method: Interim Testing of Laser Trackers, Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed April 14, 2024)
Created May 27, 2020, Updated March 1, 2021