Abstract
A focus shift during the operation of an X-ray unit is described. It is demonstrated that the focus motion could be related to thermal variations in the sizes of the unit’s elements and the X-ray tube. The key role in this process is played by extension of the tube’s anode rod. The focus shift was found to have two components, namely, a slow and a fast one. The fast component depends on the velocity of the heating of the anode; the slow one depends on an increase in oil temperature. It was experimentally proven that variations in the anode current and voltage do not directly affect the focus position.
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Original Russian Text © A.M. Stein, 2012, published in Defektoskopiya, 2012, Vol. 48, No. 6, pp. 70–76.
Materials of the First All-Russia Scientific and Practical Conference on Innovations in Nondestructive Testing with International Participation, Gornyi Altai, July 24–29, 2011.
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Stein, A.M. Analysis of a focus shift during the operation of an X-ray unit. Russ J Nondestruct Test 48, 378–383 (2012). https://doi.org/10.1134/S1061830912060071
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DOI: https://doi.org/10.1134/S1061830912060071