Department of Mechanical Engineering, Polytechnique Montréal, Montreal, QC H3T 1J4, Canada.
Sensors (Basel). 2021 Mar 18;21(6):2137. doi: 10.3390/s21062137.
This paper proposes the use of a pseudo-3D ball-lattice artifact to characterize a handheld laser scanner from a metrological standpoint. The artifact allows the computation of local and global errors in measurement by using the reference-frame-independent parameters of size, form, and distance within the measuring volume of the scanner, and in a single point cloud, without the need for registration. A set of tests was performed using the whole measuring volume, and three acquisition parameters, namely the orientation of the sweeps during the scans, the exposure time, and the distance to the scanner were analyzed for their effects on the accuracy of the scan data. A composite error including the errors in measuring size, form, and distance was used as a single figure of merit to characterize the performance of the scanner in relation to the data-acquisition parameters. The orientation of sweeps did not have a considerable effect on the errors. The accuracy of the scan data was strongly affected by exposure time and its interaction with the distance at which the artifact was scanned. The errors followed a quadratic trend with respect to the distance of the artifact to the scanner. The tested scanner performed best at its manufacturer's recommended stand-off distance.
本文提出使用伪三维球晶格伪像从计量学角度来描述手持式激光扫描仪。该伪像允许通过使用测量体内部的大小、形状和距离的参考框架独立参数以及在单个点云中计算局部和全局测量误差，而无需注册。使用整个测量体积进行了一组测试，并分析了三个采集参数，即扫描过程中扫描的方向、曝光时间和到扫描仪的距离，以研究它们对扫描数据准确性的影响。将包括测量大小、形状和距离误差的复合误差用作单个性能指标来描述扫描仪与数据采集参数相关的性能。扫描的方向对误差没有显著影响。扫描数据的准确性受到曝光时间及其与扫描伪像的距离的交互作用的强烈影响。误差与伪像到扫描仪的距离呈二次趋势。在制造商建议的距离下，测试的扫描仪性能最佳。
