Geometrical product specifications (GPS) - Acceptance and reverification tests for coordinate measuring systems (CMS) - Part 11: CMSs using the principle of X-ray computed tomography (CT) (ISO/DIS 10360-11:2021)
产品几何技术规范(GPS)坐标测量系统(CMS)的验收和再验证试验第11部分:使用X射线计算机断层扫描(CT)原理的CMS
ISO 10360本部分的目的是定义使用计算机断层扫描(CT)原理作为专用于技术工件尺寸测量的单个传感器测试坐标测量系统(CMS)的计量特性和方法。这不包括医疗成像、医疗尺寸测量以及CT的无损(材料)检测应用(例如缺陷分析)。ISO 10360本部分的目的是实现与具有触觉和光学传感器的坐标测量系统特性的可比性。
本部分描述的特性既可用于使用计算机断层扫描原理的坐标测量系统规范,也可用于各种坐标测量系统之间的比较。本标准专门用于使用基于X射线的计算机断层扫描的CMS,其中测量主要基于穿透物理物质时可见的衰减对比度。本标准也可适用于CMS,使用基于双方协议的其他层析测量原理。
本标准涵盖了使用基于轴向CT(风扇和锥束几何)运动学/几何原理的传感器的坐标测量系统以及附录F中所述的螺旋CT。本标准涵盖坐标测量系统,并定义了计量特性和测试方法,这些特性和方法专门用于均匀的非梯度单体材料,即仅由一个组成的参考标准进行测量的情况(相关)X衰减中未显示相关横向或空间梯度的材料-
射线。
ISO 10360的本部分未定义计量特性和相关测试方法,这些特性和方法专门用于测量表面粗糙度对基于CT的CMS测量的影响(参见[XXX]、[YYY]以描述潜在影响)。根据ISO 10360-2和ISO 10360-5以及ISO 10360-8,本标准定义了验收测试方法以及使用基于CT的CMS时长度测量误差和探测误差的监测方法。因此,本文件确定了使用CT时所需的其他方面:
-可用作量块替代品的参考标准
-使用替代标准时特征的可比性(例如球形边界表面)
-不同探测策略下特征的可比性(不同点数、待测量元素的覆盖度)
-各种操作条件下特性的定义
-关于处理影响量的注释,如环境条件、数学数据过滤器和测量标准表面的性质。
The purpose of this part of ISO 10360 is to define metrological characteristics and methods for testing coordinate measuring systems (CMSs) using the principle of computed tomography (CT) as a single sensor which are dedicated to dimensional measurements of technical workpieces. This excludes medical imaging, medical dimensional measurements and as well non-destructive (material) testing applications of CT (e.g. defect analyses). The intention of this part of ISO 10360 is to achieve comparability with the characteristics of coordinate measuring systems with tactile and with optical sensors. The characteristics described in this part serve both for the specification of coordinate measuring systems using the principle of computed tomography and for the comparison between various coordinate measurement systems. This standard is intentionally dedicated to the CMS using X-ray-based computed tomography where the measurements are predominantly based on the attenuation contrast visible when penetrating physical matter. This standard may also be applied to CMS using other tomographic measurement principles based on a mutual agreement.
This standard covers coordinate measuring systems using sensors based on the kinematic/geometric principles of axial CT (fan and cone beam geometries) and as well helical CT as described in Annex F. This standard covers coordinate measuring systems and defines metrological characteristics and methods for testing which are intended specifically for non-gradient mono-materials which are homogeneous, i.e. cases where measurements of reference standards are performed which consist only of one (relevant) material which does not show a relevant lateral or spatial gradient in the attenuation of X-rays.
This part of ISO 10360 does not define metrological characteristics and related testing methods which are dedicated to measure the influence of surface roughness on CT-based CMS measurements (cf. e.g. [XXX], [YYY] for describing the potential influence). In close reliance on ISO 10360-2 and ISO 10360-5 and as well ISO 10360-8, this standard defines the methods for acceptance testing and for the monitoring of length measurement errors and probing errors when using CT-based CMS. Therefore, this document establishes the additional aspects necessary when using CT:
- Reference standards usable as alternatives to gauge blocks
- Comparability of the characteristics when using alternative standards (e.g. with spherical bounding surfaces)
- Comparability of the characteristics under different probing strategies (different number of points, degree of coverage of the elements to be measured)
- Definition of the characteristics for various operating conditions
- Notes on the treatment of affecting quantities such as environmental conditions, mathematical data filters and the nature of the measurement standard’s surface.