Accuracy Evaluation of Three Dimensional Laser Range Scanner Based on Field Calibration

摘要

As a kind of advanced automatic high precision three dimension data acquisition technology,three dimensional laser range scanning is used widely in high precision modeling and reconstruction for reverse engineering.It is also titled as realistic copy technology because of its well displaying of real object.After scanning a complicate real environment in detail with large volume of points,the technology can then reconstruct an object with point cloud in computer despite of large-size,complication and irregularity of the real landscape.However,the precision of the object modeling may be influenced by the error of the data from three dimension range scanner,which will result in the bias of analysis based on such model.So it is important to calibrate the instrument based on a better understanding of the error influence.As the objective of this paper,some calibrate schemes is designed in order to analyze the error source from the laser range scanner.The work principle and operation flow of three dimension laser scanner is reviewed firstly in this paper as the basis of further work in this paper.The accuracy of the instrument is evaluated with respect to distance measurement,angle measurement,temperature,intensity of echo,time,echo mode and so on.During the procedure of experiment,LR1-R from company of 3D LaserMaping is used as the three dimension laser range scanner,Kern Mekometer is used as precision electronic apomecometer,Kern prism is used as reflecting prism and TCA2003 is used as the total station.