Calibration of a Terrestrial Laser Scanner - Institute of Geodesy and ...

56 3. Calibration of Terrestrial Laser ScannerX-Direction0 100 200 300 400 500 600 700 800 900azimuth [°]Y-Direction0 100 200 300 400 500 600 700 800 900azimuth [°]Figure 3.29:Inclination values of three data series acquired by identical setups and reduced by the levelling error;x-direction (top) and y-direction (bottom).the phase angle derived by the y-direction, but there is an angle difference of approximately 120 ° betweenthe x-direction and the y-direction instead of 90 °. In addition, [Gerstbach, 1976] investigated the theodoliteKern DKM2-A and found a phase shift in the wobble of the vertical axis between the x-direction and they-direction of 30°.The results show a significant wobble of the vertical axis exists and the wobble is repeatable.The nextquestion raised is if these results can be reproduced by independent setups.This means the wobble of thevertical axis should also be reproducible concerning the frequency, or period, the amplitude and the phaseangle, including the difference of the phase angles between the x-direction and the y-direction.ResultsThe wobble of the vertical axis was investigated with several different and independent setups.series were analyzed in the way shown so that the results concerningAll datathe harmonic oscillations describedby the parameters frequency, or period, amplitude and phase angle can be compared.following:The results are the