ACCURACY OF MEASUREMENTS MADE WITH A CYRAX 2500 LASER SCANNER AGAINST SURFACES OF KNOWN COLOUR

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Abstract
Several commercial manufacturers produce laser scanning systems capable of measuring the surfaces of objects to precisions of the order of a few millimetres at ranges of between 2 and 200 metres. Experience on a number of projects has demonstrated significant variations in the quality of point cloud data as a function of object surface reflectivity. This paper investigates the performance of a Cyrax 2500 laser scanner in making measurements to a variety of surfaces of specified colour characteristics under laboratory conditions. From the data obtained it is evident that significant systematic range discrepancies exist which can be broadly correlated against the colour of each surface with respect to the wavelength of the laser used. Over the distances investigated a high correlation between the point data quality measure returned by the scanner and the range discrepancy was observed, offering the possibility of applying a correction to the data produced by a Cyrax 2500 scanner. Such a correction, which is demonstrated to be applicable for diffusely reflecting surfaces, can be carried out with data available to the end user in order to significantly improve scanner accuracy.

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