三维激光扫描仪的精度评价分析

Accuracy evaluation and analysis of 3D laser scanner

针对三维激光扫描仪用于隧道施工中断面检测和监控量测的精度评价,从测距、测角、入射角和竖向变形位移4个方面评定三维激光扫描仪的实测精度。试验分析得出:三维激光扫描仪在实际工作环境下可以达到测距、测角的标称精度;当入射角不超过70.7°时,点位误差值在3.5 mm以内;当测距在20 m以内以及入射角在60°以内时,点位竖向变形误差绝对值不超过1 mm。结果表明将该激光扫描技术应用于隧道施工的断面检测和监控量测中具有可行性,本研究也对三维激光扫描仪在现场中的应用提出了一些建议。

Aiming at the accuracy evaluation of a three-dimensional laser scanner used for the detection and monitoring of the tunnel construction interruption surface,this paper evaluates the actual measurement accuracy of the three-dimensional laser scanner from four aspects:distance measurement,angle measurement,incident angle and vertical deformation displacement.It is demonstrated that the three-dimensional laser scanner can achieve the nominal accuracy of distance measurement and angle measurement in the actual working environment.When the incident angle does not exceed 70.7°,the point position error value is smaller than 3.5 mm.When the distance measurement is smaller than 20 m and the incident angle is smaller than 60°,the absolute vertical deformation error at the point does not exceed 1 mm.The laser scanning technology is feasible to be used in tunnel construction interruption surface detection and monitoring measurement,and some suggestions are proposed for the practical application of the 3D laser scanner.