Abstract
The description of the dual energy method (DEM) for non-destructive testing (NDT) of materials and products is presented. It highlights the key factors that determine its accuracy and performance and shows the possibilities for its further improvement. The correlation between the quantum noise level and the DEM precision of the effective atomic number was found.
Highlights
The quality control is the most massive operation in the production process, because no detail can be made without measuring its performance
F(E,E1), f(E,E2) is the energy spectra of X-rays with a maximum energy E1 and E2 correspondingly; g1(E), g2(E) are the energy dependences of attenuation coefficient of photon radiation for the two physical effects of photon interaction with matte r; EA(E) is an average value of the absorbed energy to a photon with energy E, which is registered by detector; A and B are desired dual energy method (DEM) parameters; ε(E) is the effectiveness of the radiation detecting energy E for the detector; Y(E1), Y(E2) are first and second informative parameters
At the present stage of the development of digital radiography systems, implementing DEM, there were analysed the images from 256 × 256 to 1024 × 1024 elements, and more, that is, in the pre-processing stage is necessary to find solutions from 65536 to 1048576 or more systems integrated-parametric equations of type (1)
Summary
The quality control is the most massive operation in the production process, because no detail can be made without measuring its performance. The term "digital radiography" means the aggregate of radiation NDT methods and diagnostics, which converted at some point the radiation image of the testing object (TO) into a digital signal [5,6] This digital signal is stored in computer memory and converted into two -dimensional array of measuring data, which can be subjected to various digital signal processing (contrast enhancement, scaling, antialiasing, and the like), and it is reproduced on the display screen as halftone (or colour) image directly perceived by the operator. It is obvious that the possibility of determining the atomic number (or effective atomic number) TO material makes the examination process significantly more informative This is important during examination of responsible products, designed for operation in extreme conditions, in particular for NDT of structural elements of spacecraft
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