Meana Víctor, Cuesta Eduardo, Álvarez Braulio J
Departamento de Construcción e Ingeniería de Fabricación, Universidad de Oviedo, Calle Pedro Puig Adam, E.D.O.5, 33203 Gijon, Asturias, Spain.
Materials (Basel). 2021 Sep 9;14(18):5187. doi: 10.3390/ma14185187.
To ensure that measurements can be made with non-contact metrology technologies, it is necessary to use verification and calibration procedures using precision artefacts as reference elements. In this environment, the need for increasingly accurate but also more cost-effective calibration artefacts is a clear demand in industry. The aim of this work is to demonstrate the feasibility of using low-cost precision spheres as reference artefacts in calibration and verification procedures of non-contact metrological equipment. Specifically, low-cost precision stainless steel spheres are used as reference artefacts. Obviously, for such spheres to be used as standard artefacts, it is necessary to change their optical behavior by removing their high brightness. For this purpose, the spheres are subjected to a manual sandblasting process, which is also a very low-cost process. The equipment used to validate the experiment is a laser triangulation sensor mounted on a Coordinate Measuring Machine (CMM). The CMM touch probe, which is much more accurate, will be used as a device for measuring the influence of sandblasting on the spheres. Subsequently, the influence of this post-processing is also checked with the laser triangulation sensor. Ultimately, the improvement in the quality of the point clouds captured by the laser sensor will be tested after removing the brightness, which distorts and reduces the quantity of points as well as the quality of the point clouds. In addition to the number of points obtained, the parameters used to study the effect of sandblasting on each sphere, both in contact probing and laser scanning, are the measured diameter, the form error, as well as the standard deviation of the point cloud regarding the best-fit sphere.
为确保能够使用非接触式计量技术进行测量，有必要使用以精密工件作为参考元件的验证和校准程序。在这种环境下，工业界对越来越精确但成本效益更高的校准工件有明确需求。这项工作的目的是证明在非接触式计量设备的校准和验证程序中使用低成本精密球体作为参考工件的可行性。具体而言，使用低成本精密不锈钢球体作为参考工件。显然，要将此类球体用作标准工件，有必要通过去除其高亮度来改变其光学特性。为此，对球体进行手动喷砂处理，这也是一个成本极低的过程。用于验证实验的设备是安装在坐标测量机（CMM）上的激光三角测量传感器。更精确的CMM接触式探头将用作测量喷砂对球体影响的装置。随后，也使用激光三角测量传感器检查这种后处理的影响。最终，将测试去除亮度后激光传感器捕获的点云质量的改善情况，亮度会使点云变形、减少点数并降低点云质量。除了获得的点数外，在接触式探测和激光扫描中用于研究喷砂对每个球体影响的参数包括测量直径、形状误差以及点云相对于最佳拟合球体的标准偏差。
