Advanced Computed Tomography for dimensional and surface measurements in industry

Third Party Funds Group - Sub project

Overall project details

Overall project: Advanced Computed Tomography for dimensional and surface measurements in industry

Overall project speaker:
Prof. Dr.-Ing. Tino Hausotte (Lehrstuhl für Fertigungsmesstechnik)


Project Details

Project leader:
Prof. Dr.-Ing. Tino Hausotte

Project members:
Felix Binder
Florian Wohlgemuth

Contributing FAU Organisations:
Lehrstuhl für Fertigungsmesstechnik

Funding source: The European Metrology Programme for Research and Innovation (EMPIR)
Acronym: AdvanCT
Start date: 01/06/2018
End date: 31/05/2021


Abstract (technical / expert description):

Computed tomography (CT) is an aspiring contact-free measurement
method which allows to determine the complete geometry of objects (inner
and outer geometry including surface texture) typically not fully
accessible to other measurement methods.


To support dimensional metrology in future advanced manufacturing,
the project will develop traceable CT measurement techniques for
dimensions and surface texture. Open issues regarding traceability,
measurement uncertainty, sufficient precision/accuracy, scanning time,
multi-material, surface form and roughness, suitable reference
standards, and simulation techniques will be clarified.


Therefore the AdvanCT project will face the following objects:


  1. To develop traceable and validated methods for absolute CT
    characterisation including the correction of geometry errors by 9
    degrees of freedom (DoF). This will include the development of reference
    standards, traceable calibration methods and thermal models for
    instrument geometry correction, as well as the correction of errors
    originating in the X-ray tube and the detector in order to improve CT
    accuracy.
  2. To develop improved and traceable methods for dimensional CT
    measurements with focus on measurements of sculptured / freeform
    surfaces, roughness, and multi-material effects including supplementary
    material characterisation.
  3. To develop fast CT methods for inline applications based on improved
    evaluation of noisy, sparse, few, or limited angle X-ray projections,
    reconstruction methods. This will be done using reduced number of
    projections from well-known directions and include enhanced
    post-processing.
  4. To develop traceable methods for uncertainty estimation using
    virtual CT models and Monte-Carlo simulations. This will include
    calibrated reference standards, the determination of accurate model
    parameters and the development of correction methods for specific CT
    image forming artefacts.
  5. To facilitate the take up of the technology and measurement
    infrastructure developed in the project by the measurement supply chain
    (accredited laboratories, instrumentation manufacturers), standards
    developing organisations (e.g. ISO TC213, VDI-GMA 3.33 Technical
    Committee Computed Tomography in Dimensional Measurements) and end users
    (e.g. plastic manufacturers, automotive, telecommunication, medical and
    pharmaceutical industries and metrology service providers).

The institute of manufacturing metrology will focus on the following aspects:


  1. The investigation of temperature variation within a CT system and
    its impact on projection stability as well as measurement deviations.
    The resulting thermal data can improve the characterization of CT
    systems.
  2. The systematic determination of model parameters for measurement
    simulation („digital twin“). The simulation of the measurement process
    could allow e.g. numerical measurement uncertainty evaluation. A
    successful parameter determination is a prerequisite for a faithful
    virtual CT model. Therefore, it is a key element for the simulation
    based uncertainty evaluation


External Partners

Physikalisch-Technische Bundesanstalt (PTB)
Bundesanstalt für Materialforschung und -prüfung (BAM)
Danish Technological Institute (DTI) / Teknologisk Institut
Laboratoire National de Métrologie et d'Essais (LNE)
Eidgenössisches Institut für Metrologie (METAS)
The National Physical Laboratory (NPL)
VTT Technical Research Centre of Finland
Commissariat à l'énergie atomique
Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa) / Swiss Federal Laboratories for Materials Science & Technology
University of Bath
University of Nottingham
University of Southampton
Robert Bosch GmbH
LEGO Group
Novo Nordisk A/S
Volume Graphics GmbH
Werth Messtechnik GmbH
YXLON International GmbH
Carl Zeiss Industrielle Messtechnik GmbH
Croatian Metrology Institute / Hrvatski mjeriteljski institut (HMI)

Last updated on 2019-17-07 at 14:14