Systematic errors of measurements on a measuring arm equipped with a laser scanner on the results of optical measurements
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Laser triangulation is an optical measuring method which characterizes with relatively high precision. There are many factors which can affect this type of measurement. They depend on a nature of optical measurements. Equally important from the viewpoint of accuracy is how precisely the position of the scanner in measuring volume is determined. In this paper we present tests performed using measuring arm equipped with a laser scanner. As in measuring arms position of the probe depends on the accuracy of angular encoders their influence on the results was tested. Five different strategies were chosen to show the significance of employment of additional encoders. Results showed that if less encoders are used, better results are obtained. Also overlapping of individual scans affects precision of results. Therefore one should pay attention on choosing proper measuring strategy, to not change the scanning direction excessively and to not scan the same area many times.
Keywordsmeasuring arm laser scanning angular encoders coordinate measuring techniques
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