DBPapers
DOI: 10.5593/SGEM2014/B22/S9.062

TESTING ELECTRONIC DISTANCE METERS ON SHORT ABSOLUTE LABORATORY BASELINE

J. Braun, F. Dvoracek, M. Stroner, R. Urban
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-11-7 / ISSN 1314-2704, June 19-25, 2014, Book 2, Vol. 2, 497-504 pp

ABSTRACT
The paper deals with testing of electronic distance meters (EDM) on absolute laboratory baseline. The EDM baseline is made up of 16 concrete pillars with forced centering and its length is 38.6 m. It is used in accordance with the rules for very precise measurement. To determine the coordinates and distances between pillars, very accurate industrial instrument, Leica Absolute Tracker AT401 was used (accuracy of distance measurement: 10 μm, accuracy of direction measurement: 0.15 mgon). The coordinates were determined by adjustment of polar measurement from 3 pillars. The lengths between pillars were determined with an accuracy of 0.02 mm. The baseline is used for testing EDMs of total stations that are used for accurate measurement for purposes of mechanical engineering. The EDMs were tested to determine the sizes of systematic and random errors on short distances which are common in engineering surveying. Repeated measurements were also used to determine time stability of the errors of the distance meters and the differences among the EDMs built in the same type of instruments. The main aim of the tests is to determine the real standard deviations of the distance measurement, the real systematic errors and their change depending on the distance and to develop procedure to apply the acquired information to make results more accurate and reliable.

Keywords: EDM baseline, standard deviation, pillars, forced centering plates, accurate lengths.