Logo of the Physikalisch-Technische Bundesanstalt
Production sequence of Si-spheres and interferometrical determination of the sphere volume

ISO standard for testing optical 3D coordinate measuring systems published


The published standard ISO 10360-13 describes for the first time acceptance and reverification tests for optical 3D coordinate measuring systems (3D CMS) as used in the production environment, e.g. in the automotive industry for measurements on car bodies. These measuring systems without measuring axes are often used in robot-assisted measuring and usually use the structured illumination measuring method. In this process, several views of the measured object are combined into one measurement result, e.g., with the aid of optical marks.

In addition to the determination of probing errors (P) and length measurement errors (E) known from other coordinate measuring machines and systems, the tests described in the standard also include tests to determine distortions of the measurement volume and flatness errors. A distinction is made between tests in the sensor measurement volume (SMV) and in the concatenated measurement volume (CMV) as well as between tests with a single view (SV) and tests with multiple views (MV).

In the length measurement error test, the volumetric length measurement error EVol is determined in the concatenated measurement volume with multiple views. Volumetric length measurement error means that measured distances between associated geometries, e.g., sphere centre to centre distances, are compared with calibration values.

The probing errors are determined by measurements on spheres in the sensor measurement volume, with form and diameter deviations being evaluated. The standard prescribes the determination of the probing deviations with a single and with multiple views. In addition, a distinction is made between the evaluation of all measuring points and 95 % of the measuring points.

To determine the distortion of the measuring volume, the dispersion error DCC is determined with the aid of a material standard consisting of two spheres, which is to be measured in 12 positions in the sensor measurement volume.

To determine the Flat Form Dispersion Error DForm, a flatness standard is measured in six positions in the sensor measurement volume.

German manufacturers and users of optical 3D KMS and PTB were involved in the preparation of the standard. PTB coordinated this work in Germany and contributed the results to the international standardization body ISO TC 213.

The German version of the standard will be published at the beginning of 2022.



Physikalisch-Technische Bundesanstalt
Bundesallee 100
38116 Braunschweig