DEVELOPMENT AND RESEARCH OF COMPUTED TOMOGRAPHY METHODS

Subject of Research. The paper presents the study of existing methods for automated control of printed circuit boards. Several alternative ways are proposed; namely, three approaches are considered for object form and internal structure reconstruction. Method. Twenty-two X-rays of a metal screw taken in 7° increments were chosen for the object of study at the development stage, as well as one-dimensional and two-dimensional data sets. All reconstruction methods of object three-dimensional form and structure are based on object display. The obtained digital images are processed by computed tomography techniques. Their key point is the application of specially developed algorithms for reconstruction of an object internal structure using projection data — object digital images. The first method is based on Radon transforms implemented by special libraries (MATLAB environment). The second method of an object form and structure development consists in mathematical processing of digital image pixel data in the MATLAB environment. The third method, in a similar way to the second, is based on the image pixel processing method implemented in the C programming language program. Main Results. Comparative study of all three methods is carried out. An unprocessed reconstruction of "screw" object slices with data array of 400 × 400 pixels is obtained. It is shown that the most versatile and open method for further development is the method that involves searching of X-ray pixel data by special program on C programming language. Practical Relevance. The results of the work can be useful for professionals involved in non-destructive X-ray inspection methods and specifically for circuit-board fabrication.

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