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Increasing the Rate of Recording Echo Signals with an Ultrasonic Antenna Array Using Code Division Multiple Access Technology

  • ACOUSTIC METHODS
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Abstract

The disadvantage of using the digital focusing with an antenna (DFA) method to produce an image of reflectors is a large volume of echo signals and an insufficiently high speed of their recording. We propose to increase this speed by simultaneously emitting probing signals by all elements of an antenna array (AA), formed according to the sets of code sequences used in the code division multiple access (CDMA) technology. The measured echo signals can be decoded using matched filtering (MF) and the reflectors can be reconstructed using the combined SAFT (C-SAFT) method. The image can be reconstructed without decoding the measured echo signals using the ME method. The proposed technology was tested to obtain images of reflectors in samples of duralumin, steel 20, and steel 40.

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ACKNOWLEDGMENTS

The authors are grateful to S.Yu. Romanov, A leading researcher at the Research Computing Center of Lomonosov Moscow State University, for comments and suggestions made when preparing this article.

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  1. LLC “Scientific-productional Center «Echo+”, 123458, Moscow, Russia

    V. K. Avagyan & E. G. Bazulin

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  1. V. K. Avagyan
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  2. E. G. Bazulin
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Correspondence to E. G. Bazulin.

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Translated by V. Potapchouck

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Avagyan, V.K., Bazulin, E.G. Increasing the Rate of Recording Echo Signals with an Ultrasonic Antenna Array Using Code Division Multiple Access Technology. Russ J Nondestruct Test 56, 873–886 (2020). https://doi.org/10.1134/S1061830920110029

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