CARLOS HENRIQUE DE MESQUITA

CARLOS HENRIQUE DE MESQUITA

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Development of the mechanical system on a third-generation industrial computed tomography scanner in Brazil
2011 - CALVO, WILSON A.P.; MESQUITA, CARLOS H. de; SPRENGER, FRANCISCO E.; COSTA, FABIO E. da; SALVADOR, PABLO A.V.; CARVALHO, DIEGO V. de S.; HAMADA, MARGARIDA M.
The development of measurement geometry for medical X-ray computed tomography (CT) scanners carried out from the first to the fourth-generation. This concept has also been applied for imaging of industrial processes such as pipe flows or for improving design, operation, optimization and troubleshooting. Nowadays, gamma CT permits to visualize failure equipment points in three-dimensional analysis and in sections of chemical and petrochemical industries. The aim of this work is the development of the mechanical system on a third-generation industrial CT scanner to analyze laboratory gas absorption column which perform highly efficient separation, turning the 60Co, 137Cs or 192Ir sealed gamma-ray source and the NaI(Tl) multidetector array. It has also a translation movement along the column axis to obtain as many slices of the process flow as needed. The mechanical assembly for this third-generation industrial CT scanner is comprised by strength and rigidity structural frame in stainless and carbon steels, rotating table, source shield and collimator with pneumatic exposure system, spur gear system, translator, rotary stage, drives, and stepper motors. The use of suitable spur gears has given a good repeatability and high accuracy in the degree of veracity. The data acquisition boards, mechanical control interfaces, software for movement control and image reconstruction were specially development. This third-generation industrial CT scanner has obtained good spatial resolution and images. The filtered back projection (FBP) tomographic reconstruction algorithm used has shown a faster convergence. The mechanical system presented a good performance in terms of strength, rigidity, accuracy and repeatability with great potential to be used for education or program dedicated to training chemical and petrochemical industry professionals and for industrial process optimization in Brazil.
Development of a gamma ray computed tomography technique for random packed columns analysis
2008 - MESQUITA, CARLOS H. de; VASQUEZ, PABLO A.S; PEREIRA, JOAO C.S. de M.; MARTINS, JOAO F.T.; CALVO, WILSON A.P.; HAMADA, MARGARIDA M.
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.
Development of a fourth generation industrial tomography for multiphase systems analysis
2010 - MESQUITA, C.H.; DANTAS, C.R.; COSTA, F.E.; CARVALHO, D.V.S.; MADI FILHO, T.; VASQUEZ, P.A.S.; HAMADA, M.M.
Analysis of an industrial process simulator column using third-generation computed tomography
2011 - KIRITA, RODRIGO; CARVALHO, DIEGO V. de S.; MESQUITA, CARLOS H. de; VASQUEZ, PABLO A.S.; HAMADA, MARGARIDA M.
Analysis of a multiphase phanton using industrial computerized tomographic system developed at IPEN
2011 - CARVALHO, DIEGO V. de S.; KIRITA, RODRIGO; MESQUITA, CARLOS H. de; VASQUEZ, PABLO A.S.; 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.
Phantom study using a first generation gamma tomography systems
2007 - VASQUEZ, PABLO A.S.; MESQUITA, CARLOS H. de; HAMADA, MARGARIDA M.
Methodological analysis of gamma tomography system for large random packed columns
2010 - VASQUEZ, PABLO A.S.; MESQUITA, CARLOS H. de; LEROUX, GALO A.C.; HAMADA, MARGARIDA M.
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.