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Development of the Mechanical System on a Third-Generation Industrial Computed Tomography Scanner in Brazil

Journal of Physical Science and Application 2012年第6期2卷 158-165页

作者： Carlos Henrique de Mesquita Wilson Aparecido Parejo Calvo Diego Vergagas de Souza Carvalho Francisco Edmundo Sprenger Rodrigo Kirita Pablo Antonio Vasques Salvador Fabio Eduardo da Costa Margarida Mizue Hamada National Nuclear Energy Commission Nuclear and Energy Research Institute IPEN-CNEN/SP Av. Prof. Lineu Prestes 2242 SaoPaulo 05508-000 SP-Brazil

The development of measurement geometry for medical X-ray computed tomography （CT） scanners was 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 laboratorial process columns which perform highly efficient separation, turning the ^6oCo, ^75Se, ^137Cs and/or ^192Ir sealed gamma-ray source（s） and the NaI（Tl） multidetector array. It also has 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. A multiphase phantom capable to be setting with solid, liquid and gas was testing. The scanner was setting for 90 views and 19 projections for each detector totalizing 11,970 projections. Experiments to determine the linear attenuation coefficients of the phantom were carried out which applied the Lambert-Beer principle. Results showed that it was possible to distinguish between the phases even the polymethylmethacrylate and the water have very similar density and linear attenuation coefficients. It was established that the newly developed third-generation fa

关键词： Industrial computered tomography third-generation scanner troubleshooting industrial process optimization tomograficreconstruction algorithm.

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