24 November 2016 Concentricity calibration of photogrammetry retro-reflector target
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Close range digital photogrammetry is being widely used in industrial measurements. The measurements are usually carried out with a mobile retro-reflector target, which is consists of a shaft and reflective target fixed in the center of the shaft. When the center of the target and the axis of the shaft is not consistent, it will introduce measurement error. Therefore, the concentricity of target is an important parameter for the measurement results. To achieve the concentricity of retro-reflector target a multi-sensor coordinate measurement machine with imaging probe and touch probe is used. In this combined measurement system the touch probe measure the axis of the shaft, and imaging probe measure the center of reflective target. An artifact is designed to evaluate the performance of combined system. This artifact is defined as a sharp edged hole in a metal plate. It is suitable to measure with touch probe as well as imaging probe. The touch probe measures 25 points on the hole and then with the imaging probe. With all the points measured by two kinds of probe the evaluation parameters including combination size error, form error and location error are calculated. These parameters are consistent with the ISO standard 10360-9. It indicates that combined measurement uncertainty is 3.2 microns which can meet the calibration requirements of target concentricity.
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Hengzheng Wei, Hengzheng Wei, Weinong Wang, Weinong Wang, Limei Pei, Limei Pei, Guoying Ren, Guoying Ren, } "Concentricity calibration of photogrammetry retro-reflector target", Proc. SPIE 10023, Optical Metrology and Inspection for Industrial Applications IV, 1002309 (24 November 2016); doi: 10.1117/12.2244876; https://doi.org/10.1117/12.2244876

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