System calibration of digital levels

Digital levels and the corresponding rods are complex measurement systems which makes it necessary to focus on system calibration rather than on the calibration of the individual components. For this task, a vertical comparator was built at our Institute.

In the geodetic measurement laboratory, levelling systems are calibrated by means of a vertical comparator. The system is optimized for digital levelling equipment with coded staffs. The staff is mounted in the vertical comparator. It can be moved vertically by a motor driven stage. The displacement of the stage is continually tracked with a laser Doppler interferometer. The levelling instrument is mounted on a horizontal stage and can be moved to positions at arbitrary distances (range: 5 to 25m) from the staff. The calibration is controlled by a PC, which guides the movement of the rod and records simultaneous interferometer and level readings.


To top

Related publications
image/svg+xml

Woschitz H. (2014) Laboruntersuchung von Digitalnivellieren. Proc. 17. Int. Ingenieurvermessungskurs, ETH Zürich. Reprint

Woschitz H., Gassner G., Ruland R. (2007) SLAC Vertical Comparator for the Calibration of Digital Levels. Journal of Surveying Engineering 133: 144-150. PDF

Heister H., Woschitz H., Brunner F.K. (2005) Präzisionsnivellierlatten, Komponenten- oder Systemkalibrierung? Allg. Verm. Nachr. 112: 233-238. Reprint

Woschitz H. (2005) Systemkalibrierung: Effekte von digitalen Nivelliersystemen. Allg. Verm. Nachr. 112: 239-244. Reprint

Brunner F.K., Woschitz H. (2004) Die selbstleuchtende Nivellierlatte. Allg. Verm. Nachr. 111: 104-109. Reprint

Woschitz H., Brunner F.K. (2003) Development of a Vertical Comparator for System Calibration of Digital Levels. Österreichische Zeitschrift für Vermessung und Geoinformation 91: 68-76. PDF

Woschitz H., Brunner F.K., Heister H. (2003) Scale Determination of Digital Levelling Systems using a Vertical Comparator. ZfV 128: 11-17. PDF

Woschitz H., Brunner F.K. (2002) System Calibration of Digital Levels - Results. Proc. 2nd Conference of Engineering Surveying, Bratislava. PDF

Woschitz H., Brunner F.K., Heister H. (2002) Scale Determination of Digital Levelling Systems using a Vertical Comparator. Proc. FIG XXII, Washington D.C. PDF

Rüeger J.M., Brunner F.K. (2000) On System Calibration and Type Testing of Digital Levels. ZfV 125: 120-130. Reprint