Abstract
Due to the diverse application areas of dimensional metrology and the demand for surveys where precision is guaranteed, the approach through geodetic surveying techniques is an alternative for large-scale metrology. In the Laboratory of Geodetic Instrumentation of the Federal University of Parana, a structure was developed for calibration of vertical Invar rods and digital leveling systems, in which this structure is composed of two parallel guide rails. The vertical deviations of these guide rails can cause deviations during the calibration processes, and consequently, affect the results of the calibration procedure. Therefore, an investigative study is proposed to determine these deviations of the guide rails by different techniques and equipment. Direct leveling methods (differential leveling using digital level and optical level), indirect methods (trigonometric leveling using total station) and electronic level were used. As results, the vertical deviations of the guide rails were obtained with submillimetre precision, regardless of technique and methodology applied. The results were evaluated using the Pearson correlation coefficient, indicating that there were no statistical differences between the calculated deviations.
Highlights
Metrology is defined by the International Bureau of Weights and Measures (BIPM) as the science of measurement, which covers theoretical and practical aspects of measurements, regardless of uncertainty level and field of application (BIPM, 2017)
Large scale metrology, engineering survey or industrial geodesy are some of the terms used for the application of geodetic or photogrammetric techniques for precise measurement of large objects when conventional techniques are not appropriate (LEICA GEOSYSTEMS, 2011), such as the use of traditional coordinate measuring machines (CUYPERS et al, 2009)
The Laboratory of Geodetic Instrumentation (LAIG) of the Federal University of Paraná (UFPR) has developed a structure for calibration of vertical Invar rod and digital leveling systems, which consists of two parallel guide rails used to move a transport system that contains part of the equipment used in the calibration process
Summary
Metrology is defined by the International Bureau of Weights and Measures (BIPM) as the science of measurement, which covers theoretical and practical aspects of measurements, regardless of uncertainty level and field of application (BIPM, 2017). Large scale metrology, engineering survey or industrial geodesy are some of the terms used for the application of geodetic or photogrammetric techniques for precise measurement of large objects when conventional techniques are not appropriate (LEICA GEOSYSTEMS, 2011), such as the use of traditional coordinate measuring machines (CUYPERS et al, 2009). Other terms, such as industrial surveying or industrial metrology, are adopted and refer to this same concept. Since the geometry of these guide rails can cause deviations in the calibration result, it is important to model possible vertical deviations that are compatible with the quality of the calibration process
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