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Computed tomography (CT) Luci – Lucerne Ct Imaging  

Computed tomography (CT) is a non-destructive method of measuring cross sections of an object by spinning the test sample around a fixed axis and recording multiple X-Ray images separated by small, angular steps. For each voxel in the image, the grey level indicates the absorbance of X-Rays and thus allow conclusions to be drawn about the distribution of materials in the object and their relative densities.

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What can you do with a CT?

The cross-sectional images produced of the examined object not only reveal the interior composition of the object, but additionally help identify the presence and cause of defects within the specimen, without altering the test sample. Furthermore, the CT allows the distribution of aggregates within a specimen to be quantified whilst the object is measured internally and externally simultaneously with high accuracy. Due to the short measuring time, it is also possible to investigate dynamic processes and track the internal changes of the object in 3D. Luci has the ability to examine a wide-range of materials: from wood and aluminium, to steel or even denser samples. In particular, biological samples such as, vegetables, fruits, cheese and even biological tissue can be examined.

System properties

Penetration capability

225 kV source (equivalent to 150 mm solid aluminium or 7 mm solid steel)

CT resolution

In principle the resolution is the diameter of the field of view divided by 3000/6000 (with measuring circuit extension), but at most 0.5-1 micrometre

Radiography resolution

2800 x 2800 pixels with 15 frames per second (full frame) and up to 85 frames per second with 2 x 2 binning

Measurement circuit extension

By combining 2 horizontally or vertically shifted measurements, the field of view can be doubled

Helix scan

Objects with a length up to 60 cm can be measured in a single experiment

Permissible sample size

Diameter 520 mm, height 650 mm, 20 kg (precision measurement), 50 kg (standard measurement)

Suitable for metrology

Due to the solid granite manipulator base and the temperature in the measuring chamber, the system is suitable for metrological tasks

Possible application

  • Distribution analysis: Whether aggregates in concrete, rock in asphalt or nuts and nougat in chocolate, CT supports you in measuring the position and orientation of each component in the sample and their relative distributions.
  • Defect analysis: CT offers the possibility to look inside a component without having to disassemble it. Therefore, you have the possibility to perform defect analysis without altering the test object.
  • Metrology and shape acquisition: CT allows you to measure exact external and internal geometries and thus determines the shapes of objects without needing invasive or destructive techniques.
  • Input data for simulations: Since CT can digitalise the shape of objects, the input geometry data for structural, thermal, or fluid mechanical simulations can be determined directly from the CT measurements. The true geometry of the object can subsequently be used for simulations.
  • In-situ measurements: Owing to the large measuring room, loading devices for tension/compression/humidity measurements, heating or cooling tests and moisture loads can be installed. Therefore, measurements of the object under load can be carried out.
  • 4D measurements: Thanks to short measuring times or time-lapse recordings, dynamic processes can additionally be investigated. This permits, for example, to track the development of defects within the sample materials in the object and their relative densities.

Legomännchen: Sichtbar sind sowohl kleinste Spritzgussfehler, wie auch Materialunterschiede zwischen unterschiedlichen Kunststofftypen.
Virtueller Schnitt durch einen Sensor. Sichtbar sind sowohl die feinen Fasern zur Verstärkung der Gehäusewand wie auch die Aluminium-Bonddrähtchen.
3D Visualisierung der Kavitäten und Porositäten in einer Meringuesschale.
Eine Schüttprobe aus kugelförmigem Material (Zeolit) dient als Ausgangspunkt eine Simulation der Wasserpermebilität. Sichtbar ist der Becher mit den kugelförmigen Proben (grau), die Verteilung der Geschwindigkeiten in einer Schicht und die Strömungslinien von Wasser durch die Probe.
Abbildung einer Himbeere
Fotos im Bereich Computertomograph
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LuCi happy about future MSE photonics students

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Master of Science in Engineering Specialization in Photonics

Master of Science in Engineering: Indepth engineering expertise The Master program offers you a future-oriented study program providing you with the necessary professional development for your progressing career. Guided by experts, the program offers a unique focus on research and projects in industry specific spezialisations.

More information about the specialisation Photonics here ->