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Use of the distance transform for the integration of local measurements : principle and application in the field of chemical engineering.

Abstract : We propose an original methodology to integrate local measurement for non-trivial object shape. The method employs the distance transform of the object and least-square fitting of numerically computed weighting functions extracted from it. The method is exemplified in the field of chemical engineering by calculating the global metal concentration in catalyst grains from uneven metal distribution profiles. Applying the methodology on synthetic profiles with the help of a very simple deposition model allows us to evaluate the accuracy of the method. For high symmetry objects such as an infinite cylinder, relative errors on global concentration are found lower than 1% for well resolved profiles. For a less symmetrical object, a tetralobe, the best estimator gives a relative error below 5% at the cost of increased measurement time. The applicability on a real-case is demonstrated on an aged hydrodemetallation catalyst. Sampling of catalyst grains at the inlet and the outlet of the reactor let us conclude to different reactivity for the trapped metals.
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https://hal.archives-ouvertes.fr/hal-01394873
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Submitted on : Thursday, February 2, 2017 - 11:14:49 AM
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Loïc Sorbier, Frédéric Bazer-Bachi, Yannick Blouet, Maxime Moreaud, Virginie Moizan-Baslé. Use of the distance transform for the integration of local measurements : principle and application in the field of chemical engineering.. Microscopy and Microanalysis, Cambridge University Press (CUP), 2016, 22 (2), pp.422-431. ⟨10.1017/S1431927616000015⟩. ⟨hal-01394873⟩

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