| dc.description | 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. | |
