Industrial measurement and test systems

Mittels OCT dargestellter Riss in Zirkoniumoxid.
© Fraunhofer IKTS
OCT image of a crack in zirconium oxide.

Structural analysis of ceramics by means of optical coherence tomography

 

Optical coherence tomography (OCT) applied for visual 3D testing provides high-resolution information on scattering intensities in various materials, like ceramics, plastics, glasses, glass fiber-reinforced plastics or biological materials. From signal imaging, a wide range of quality parameters can be extracted.

This contact-free, highly resolved and quickly working measurement method is especially suited for the structural analysis of ceramics. With the aid of OCT, for example, pore sizes and web thicknesses of ceramic foams can be determined or structural defects, like cracks, pores or dents can be automatically detected.

Compared to existing methods, OCT is characterized by a continuously high accuracy under industrial conditions (vibration, dust, highly smooth and transparent surfaces) and can be applied to the whole production chain.

Further application fields of OCT:

  • Foreign object detection in filling processes (fragments, residual liquids, biological foreign objects)
  • Strain measurement
  • Structural analysis (delaminations, inclusions, cracks, construction of multilayered systems, coatings)
  • Surface metrology

For more information on OCT, please contact:

Andreas Lehmann
Department: Bio- and Nanotechnology, Group: Optical Coherence Tomography

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Nahaufnahme einer Folie mit Lufteinschlüssen
© Fraunhofer IKTS
Tape with air inclusions.

Automated thickness measurement of tapes in roll-to-roll processes by means of optical coherence tomography

 

For the automated, production-related monitoring of tape manufacturing processes, Fraunhofer IKTS uses optical coherence tomography and offers a fully automated inline thickness measurement in real-time, which is also available as service and laboratory device. This measurement technology is contact-free, highly resolved and fast. Compared to existing methods, OCT is characterized by its continuously high accuracy under industrial conditions (vibration, dust, highly smooth and transparent surfaces).

For more information on OCT, please contact:

Dr.-Ing. Malgorzata Kopycinska-Müller
Department: Bio- and Nanotechnology, Group: Characterization Technologies

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Aufnahme eines keramischen Gewebes mit dem Röntgenzeilendetektor L100e®
© Fraunhofer IKTS
Image of ceramic tissue by x-ray line detector L100e®.

X-ray line detector L100 – direct-converting, counting x-ray detector for 100 % inline testing

 

The x-ray line detector L100 solves complex tasks in the area of non-destructive testing at an unmatched quality. It comprises energy discrimination, single photon counting, high resolution as well as flexibility and speed. Besides its actual application – the detection of x-radiation – the line detector L100 can also be adapted to optical testing tasks (process control, sorting, tomography).

L100 is just one of the possible configurations of the sensor system. Other applications include very long as well as curved detectors. Moreover, special configurations can be realized for proving high counting rates.

For more information on the x-ray line detector L100, please contact:

Dr. Peter Krüger
Department: Accredited Test Lab

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Durch ein Fenster ist  der zweiter Prototyp eines Diagnosesystems (OCD) für die optische Krebsdiagnose zu sehen und in der Reflektion sieht man eine Person die mit einer verdunkelten Brille den Prototyp betrachtet.
© Fraunhofer IKTS
3D dosimeter for the detection of high-energy radiation on curved 3D free-form surfaces.

Multidimensional dosimeter for the detection of ionizing radiation

 

The dose of ionizing radiation (e.g. gamma or electron radiation) can be measured by using ceramic phosphors. In the particle-based dosimeter of the Fraunhofer IKTS the dose information is derived from the particles’ optical properties. In the measuring range 0–30 kGy the dose can be read out from a particle-coated free-form surface of any shape with high spatial resolution. Furthermore, dose-depth distributions are also possible by optical readout of embedded, dosimetrically active particles.

More information about the luminescent particle-based dosimeter can be found here:

Whitepaper: Multidimensional dosimetry

Dr.-Ing. Christiane Schuster
Department: Testing of Electronics and Optical Methods, Group: Optical Test Methods and Nanosensors

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© Fraunhofer IKTS
Automated inline inspection system based on laser-speckle-photometry (LSP).

Laser Speckle Photometry for inline quality assurance

 

The laser speckle photometry (LSP), developed by Fraunhofer IKTS, is a contactless, inline-capable and cost-effective method. It is suitable for the time- and spatially resolved characterization of material properties, for monitoring mechanical stress changes, for the detection of surface defects, for process monitoring and for geometric measurement. In addition to traditional metal and non-metal materials also composites and organic substances are investigated.

LSP evaluates the temporal variation of the speckle patterns (interference patterns), which are connected via different parameters with mechanical and structural properties of the component (porosity, residual stress, hardness, roughness, degradation, inhomogeneity) and which are physically coupled to the change of the thermal conductivity of the material structure.

Fraunhofer IKTS offers the LSP for application in the following areas:

  • Inline quality assurance in production areas with high quantities
  • Development of customized LSP-based complete test systems
  • On-site measurement service
  • Process monitoring (e.g. porosity/defects in additive manufacturing, monitoring of biotechnological processes)
  • Stress monitoring of large components with fatigue stress (structures, bridges)
  • Defect detection for almost all classes of materials
  • Geometric measurement of electronic components

For more information on LSP, please contact:

Dr. Beatrice Bendjus
Department: Testing of Electronics and Optical Methods, Group: Speckle-Based Methods

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Process monitoring with Laser Speckle Photometry – fast, accurate, non-contact, non-destructive.