METHOD FOR THE NONDESTRUCTIVE 3D ANALYSIS OF A TEST SPECIMEN BY MEANS OF COMPUTER TOMOGRAPHY

摘要

In the method for data determination for a nondestructive 3D analysis of a test specimen by means of computer tomography, first a reference data record comprising image information of a first sequence of radiography images of a test specimen is provided, the first sequence of radiography images having a first average angle increment ?a. Then, image information of a second sequence of radiography images of the test specimen, which has a first state, are generated with an average angle increment ?ß, the second angle increment ?ß being larger than the first angle increment ?a. Thereafter, the respective image information of the second sequence of radiography images is compared with the angularly associated image information of the first sequence of radiography images by means of 2D image correlation, so as to obtain a comparison result. If the comparison result, at an angle position ßi of the second sequence, reaches a threshold value, image information of a third sequence of radiography images of the test specimen is generated in regions around the angle position ßi and with a third average angle increment ??, the third angle increment ?? being smaller than the second angle increment ?ß. Finally, the reference data record is updated on the basis of the image information of the third sequence of radiography images so as to obtain an updated reference data record.