CARLOS HENRIQUE DE MESQUITA

CARLOS HENRIQUE DE MESQUITA

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Emission and transmission tomography system applied to analyze industrial process inside chemical reactors
2020 - MESQUITA, C.H.; VELO, A.F.; CALVO, W.P.; CARVALHO, D.V.; HAMADA, M.M.
The tomography techniques are widely used in many industries, such as: chemical, food, pharmaceutical and oil sectors. In the industries the tomography is used to diagnose the state of the machines of production and also in the control of quality of the produced objects. A portable tomography system known as instant-non-scanning type, a similar version of the fourth generation CT, was developed in this work. It is capable to obtain measurements in real time conditions without interrupting the operation of the industrial production and it is useful in the quality control of the means of production and the objects produced. This paper describes an innovative hybrid industrial tomographic system, i.e., simultaneous data from the emission of an internal radioactive source introduced inside to the object (67Ga citrate) and tomographic transmission using five sources of 137Cs positioned externally to the object which are distributed at the vertices of a pentagon. The tomographic system described here is useful for studying dynamic chemical phenomena, associated or not with multiphase systems commonly found in chemical reactors and distillation columns.
A new industrial tomography system combining simultaneously the emission and transmission tomography systems
2018 - MESQUITA, C.H.; VELO, A.F.; CALVO, W.A.; CARVALHO, D.V.; HAMADA, M.M.
The tomographic techniques can be used in many industries to explore the interior of their objects, for example, (a) to act as the quality control of industrialized products or (b) to diagnose and identify failure in their production devices. Commonly, the industrial objects are chemical reactors, packaging of foods, encapsulated medicaments, columns of petroleum distillation, combustion engines, among other industrial objects. A portable tomography system known as instant-non-scanning type, a similar version of the fourth generation CT, was developed in this work. It comprises 70 NaI(Tl) detectors with the same number of multichannel type acquisition boards.One of the advantages of industrial tomography is that it allows inferring the quality of the production line without interrupting the production. The tomographic system described in this work is capable to obtain measurements in real time and requires no movement of radiation sources and detectors. The tomographic system, proposed in this work, allows the introduction of a radioactive tracer inside the industrial object, for example a tube or chemical reactor and then the user will obtain the reconstruction images of a tomographic emission system together to the transmission image. By means of radioactive sources positioned externally to the object the user will obtain the reconstructed images of the transmission tomographic system. Therefore, this article describes an innovative hybrid industrial tomographic system, capable of generating both emission and transmission tomographic images simultaneously.
Multi-source third generation computed tomography for industrial multiphase flows applications
2011 - MESQUITA, CARLOS H. de; VASQUEZ, PABLO A.S.; CALVO, WILSON A.P.; MARCATO, LARISSA A.; CARVALHO, DIEGO V.S.; MARTINS, JOAO F.T.; HAMADA, MARGARIDA M.
Description of two tomography systems developed at IPEN-CNEN/SP
2007 - TETZNER, GUARACIABA de C.; HAMADA, MARGARIDA M.; MADI FILHO, TUFIC; VASQUEZ, PABLO A.S.; RELA, PAULO R.; CALVO, WILSON A.P.; MESQUITA, CARLOS H.
Gamma-ray computed tomography SCANNERS for applications in multiphase system COLUMNs
2009 - CALVO, WILSON A.P.; HAMADA, MARGARIDA M.; SPRENGER, FRANCISCO E.; VASQUEZ, PABLO A.S.; RELA, PAULO R.; MARTINS, JOAO F.T.; PEREIRA, JOAO C.S. de M.; OMI, NELSON M.; MESQUITA, CARLOS H. de
Gamma-ray tomography experiments have been carried out to detect spatial patterns in the porosity, in a 0.27 m diameter packed steel column using a first generation computed tomography (CT) system. The CT scanner consists of a NaI(Tl) detector 5.08 cm in diameter, and an encapsulated 137Cs (3.7 GBq) radioactive source, located opposite to the center of the detector. The detector and the source, mounted on a fixed support and the column, can rotated and dislocate by two stepping motors controlled through a microprocessor. Different sizes of stainless steel Raschig rings (12.6, 37.9 and 76 mm) have been examined. The primary objective of this work is to detect spatial patterns and statistical information on porosity variation in packed distillation columns. Horizontal scans, at different vertical positions of the packed bed were made for each size of Raschig rings. Radial porosity variation within the packed bed has been determined. This study has demonstrated that the porosity and its spatial distribution in a metallic packed column can be measured with adequate spatial resolution using the gamma-ray tomography technique. After validation of this first generation CT, the turntable design to rotate and dislocate the 60Co or 137Cs sealed gamma-ray sources and multidetector array for the third generation industrial computed tomography was also developed.
Development of the mechanical system on a third-generation industrial computed tomography scanner in Brazil
2012 - MESQUITA, CARLOS H. de; CALVO, WILSON A.P.; CARVALHO, DIEGO V. de S.; SPRENGER, FRANCISCO E.; KIRITA, RODRIGO; SALVADOR, PABLO A.V.; COSTA, FABIO E. da; HAMADA, MARGARIDA M.