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Laserskanner för precisionsmätning 2D/3D
New field of applications in previously unexplored areas emerges at the same time as the UAS technology constantly evolves. In the construction industry and especially in civil engineering applications which this study covers with, the UAS photogrammetry is quite an unexplored technology and despite its ability to quickly measure and estimate various properties on a construction site. Since follow-up of cost estimates and production plans is fundamental for the success of a construction project, the purpose of the study has been to evaluate to how unmanned aerial vehicles UAV can be used to monitor the production progress of civil engineering works. The reconstruction included camera, tripod, cables, protective casing and memory cards for programming the camera. To evaluate the accuracy of the UAS photogrammetry, the measurement was compared with total station measurements and terrestrial laser scanning. All measurements have been performed on hard flat and hilly surfaces. As reference for the measurements values from the total station were used. Accuracy in height of 9 mm was obtained which is the same precision as the laser scanning delivered in the same study. For larger contiguous areas, terrain models from laser scanning and UAS photogrammetry were compared, one flat surface area and two hilly surface areas. A mean deviation of 9 mm was obtained for the flat area while the deviation ranged between mm for the hilly areas.
Compact size combined with low weight opens up new fields of application in profile measurement. The controllers of the scanCONTROL profile sensors being integrated in the housing simplify cabling arrangements and mechanical integration. Due to their compact size and their high profile frequency, the laser profile sensors are ideally suited to dynamic measurement tasks, e. Laser scanners from Micro-Epsilon are available either with red laser or the patented blue laser technology. Laser scanners with blue laser line are preferably used for profile measurement with organic and transparent objects, as well as for red-hot glowing metals. While allowing higher stability, the blue laser light does not penetrate the measurement object due to the shorter wavelength of the blue-violet laser.