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TOFD Echo Signal Processing to Achieve Superresolution

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Abstract

It is proposed to use the method of maximum entropy (ME) and the method for constructing the AR model of the TOFD echo spectrum together with the method of splitting the spectrum to increase its resolution and, consequently, information content. The effectiveness of the approach proposed is demonstrated in model experiments. As a result, the resolution of TOFD echo signals has increased by at least two times, and the noise level has decreased by 6 dB. The higher resolution of TOFD echoes allows for phase analysis of echoes and conclusions about reflector type.

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ACKNOWLEDGMENTS

The author is grateful to M.S. Sadykov for carrying out the experiments and to the chief designer of the Research and Production Center ECHO+ A.E. Bazulin for the comments and suggestions made during the preparation of the article.

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  1. Research and Production Center ECHO+, 123458, Moscow, Russia

    E. G. Bazulin

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  1. E. G. Bazulin
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Correspondence to E. G. Bazulin.

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Bazulin, E.G. TOFD Echo Signal Processing to Achieve Superresolution. Russ J Nondestruct Test 57, 352–360 (2021). https://doi.org/10.1134/S1061830921050053

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  • DOI: https://doi.org/10.1134/S1061830921050053

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