Application of super-resolution techniques to expert testing of welded joints in pipelines of nuclear power plants

Utilization of super-resolution techniques in processing reflected signals in ultrasonic testing has proved to be useful with a view to improve expert estimates of defect dimensions and shapes with the help of theAvgur holographic facility. In particular, the improvements in the image quality mostly...

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Bibliographic Details
Published in:Russian journal of nondestructive testing 2000, Vol.36 (1), p.45-50
Main Authors: BADALYAN, V. G, BAZULIN, E. G, VOPILKIN, A. Kh, GREBENNIKOV, D. V, TIKHONOV, D. S
Format: Article
Language:English
Subjects:
Defects
Flaw detection
Frequencies
Image quality
Nuclear power plants
Signal to noise ratio
Ultrasonic testing
Welded joints
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Summary:Utilization of super-resolution techniques in processing reflected signals in ultrasonic testing has proved to be useful with a view to improve expert estimates of defect dimensions and shapes with the help of theAvgur holographic facility. In particular, the improvements in the image quality mostly due to athree-fold increase in the beam coordinate resolution has allowed more accurate determination of defect dimensions and more reliable classification of defects.A lower intensity of the speckle noise due to the broader frequency band can also be considered as a favorable feature of the extrapolation techniques. The signal-to-noise ratio in the images of flaws in materials with an intense structural noise isa factor of about 1.7 higher when super-resolution techniques are used. The paper describes some results of practical utilization of super-resolution techniques in estimating dimensions of flaws detected in welded joints of DU-300 pipelines (an effective diameter of 300 mm) of nuclear power plants.
ISSN:1061-8309
1608-3385
DOI:10.1007/BF02759393