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Production sequence of Si-spheres and interferometrical determination of the sphere volume

Precision Engineering

Division 5

Dimensions from several metres down to nanometres — precise dimensional metrology as backbone of a reliable and sustainable industrial production.


It is the main task of the division to assure the traceability of industrial measurements in different length and angle ranges by application of special measuring instruments, methods and standards. Also hardness metrology belongs to its scope. The aim of these activities is to offer traceability to industry in an adequate way and to jointly solve respective measurement challenges.
The research and development activities needed for these tasks focus on new measurement methods, instrumentation and standards. In addition the division is engaged in manufacturing and measurement tasks in the field foundations of metrology. The Scientific Instrumentation offers construction and manufacturing services for special components and precision instruments for the whole PTB.

5 Abteilungsbericht aus dem Jahresbericht 2021

Der Initiates file downloadAbteilungsbericht gibt einen Überblick über die wichtigsten Nachrichten und Ereignisse der Abteilung „Fertigungsmesstechnik“ des letzten Jahres und ergänzt somit den Opens internal link in current windowJahresbericht-2021 der PTB.


In ICT, the usable dynamic range of the X-ray images, i.e. the useful contrast, limits the maximum material thickness and the accuracy of the surface determination. In the EMPIR project "AdvanCT", various influences on the imaging, such as parasitic source regions and light scattering in the scintillator of the detector, were examined and model-based corrections implemented. This made it possible, for example, to determine the surfaces with an accuracy of 1/10 of the voxel size even with an array of overlapping steel gauge blocks.

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In the WIPANO project CTSimU a procedure for the basic qualification of X-ray CT simulation software for dimensional measurements of macroscopic parts was developed. This basic qualification tests the correct implementation of basic physical effects and software functionalities. The outcomes of the project are currently being incorporated in a VDI/VDE guideline for the basic qualification of CT simulation software. The basic qualification represents the first step towards standardisation for the determination of measurement uncertainty in dimensional CT measurements by means of simulation.

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The published standard ISO 10360-13 describes for the first time acceptance and reverification tests for optical 3D coordinate measuring systems (3D-CMS) such as those used in the automotive industry for measurements on car bodies. German manufacturers and users of optical 3D CMS 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.

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Data Analysis Service for Precision Engineering

The data analysis support provides advice to adopt numerical and system theoretical procedures to the specific tasks of the different departments. The support covers detailed advice and implementation support as well as tests and comparisons. Furthermore, the roughness reference software RPTB is also taken care of here, Opens external link in new windowhttps://www.ptb.de/rptb.

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