13 November 2014 Long-range active retroreflector to measure the rotational orientation in conjunction with a laser tracker
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Abstract
High precision optical non-contact position measurement is a key technology in modern engineering. Laser trackers (LT) accurately determine x-y-z coordinates of passive retroreflectors. Next-generation systems answer the need to measure an object‘s rotational orientation (pitch, yaw, roll). So far, these devices are based either on photogrammetry or on enhanced retroreflectors. Here we present a new method to measure all six degrees of freedom in conjunction with a LT. The basic principle is to analyze the orientation to the LT’s beam path by coupling-out laser radiation. The optical design is inspired by a cat’s eye retroreflector equipped with an integrated beam splitter layer. The optical spherical aberration is compensated, which reduces the divergence angle for the reflected beam by one order of magnitude compared to an uncompensated standard system of the same size. The wave front distortion is reduced to less than 0.1 λ @ 633 nm for beam diameters up to 8 mm. Our active retroreflector is suitable for long-range measurements for a distance > 10 m.
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O. Hofherr, O. Hofherr, Christian Wachten, Christian Wachten, C. Müller, C. Müller, H. Reinecke, H. Reinecke, } "Long-range active retroreflector to measure the rotational orientation in conjunction with a laser tracker", Proc. SPIE 9276, Optical Metrology and Inspection for Industrial Applications III, 92760V (13 November 2014); doi: 10.1117/12.2071945; https://doi.org/10.1117/12.2071945
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