Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
A new 3D positioner for the analytical mapping of non-flat objects under accelerator beams
Section snippets
Background
The analytical imaging implemented by particle accelerators or synchrotrons based on the raster scanning of beams at the surface of the sample provides the effective multi-scale mapping of elements and compounds. This approach is however restricted to flat surfaces because the applied analytical methods require a constant geometry with respect to a detection system for each point of the map. There are many application domains where the sample surface is not flat, in particular in Cultural
Objectives
The above-mentioned approach was retained for the analysis of complex artefacts with beams produced by large-scale facilities offered within the IPERION-CH European program [8], namely two particle accelerators at AGLAE-C2RMF in Paris, France and at ATOMKI in Debrecen, Hungary, the synchrotron SOLEIL in Saclay, France and the Budapest Neutron Centre in Hungary. The new 3D positioner was developed within a joint research activity (JRA) of this program entitled ‘innovative instruments and methods
3D positioner mechatronics
The positioner is designed upon a robot-vision solution combining 3D optical imaging and 3D positioning. The X/Y/Z coordinates of the sample surface to be mapped are captured using a laser digitizer prior to the experiment. The recorded coordinates are subsequently used to position and raster scan the sample under the fixed analysing beam using a 6°-of-freedom robot (3 translations +3 rotations).
The 3D laser digitizer is a KONICA MINOLTA model VIVID 900 equipped with a 25.5 mm telephoto lens
3D positioner testing
The 3D positioner was tested on an object specially handcrafted for the purpose of the test by the laboratory of the Cité de la Céramique in Sèvres, France, using traditional materials. The object (pot model Mézy) has a 140 mm diameter and 80 mm height and weights 420 g. Its body is made of glazed porcelain and exhibits a curved shape (Fig. 7). The curvature of the lid is moderate while that of the belly is more pronounced. It is decorated with a complex polychrome motif with very fine details
Conclusion and perspectives
The new 3D positioner for mapping artefacts of complex shapes has been designed, assembled and implemented in the AGLAE scanning external microbeam end-station. It has been successfully tested on a curved object from heritage applications in PIXE mode and its validation in RBS mode is planned. The 3D positioner also requires a specific support to hold securely the object in the 3D positioner. The 3D printing of a supporting mould made of suitable material and based on the digitized model of the
Declaration of Competing Interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Acknowledgements
We acknowledge the funding of the present project by the IPERION-CH European program (GA. 654028). We are indebted to V. Jonca, head of creation and production and O. Dargaud head of research service from Cité de la Céramique, Sèvres, France for the design and handcrafting of the decorated porcelain test sample. We thank A. Maigret, N. Mélard and C. Hochart from the imaging group of the C2RMF for their help in the operation of the 3D digitizer. L. Sz. acknowledges the financial support of the
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