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Reducing the Level of Weakly Changing Noise by the Decorrelation Method during Ultrasonic Monitoring Using Antenna Arrays

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Abstract

In ultrasonic testing with antenna arrays, the measured echo signals may contain interference echo signals that, after reconstructing the image of reflectors, can produce false flares that impede image analysis. Such unwanted pulses include reverberation noise pulses arising from the reflection of a probing pulse from the wedge boundaries and/or pulses reflected from a structural reflector in the test object. In the case where such pulses remain highly stable from measurement to measurement, the easiest method for reducing their amplitude is to subtract a template with the interfering pulses from the measured echo signals. However, if interfering pulses vary slightly during ultrasonic testing, thus in a minor way changing the arrival time and amplitude, then suppressing them by subtracting the noise template will not be effective. To reduce the level of the slightly varying interference, it is proposed to apply the decorrelation procedure. The effectiveness of the approach proposed is demonstrated in model experiments.

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Authors and Affiliations

  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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Translated by V. Potapchouck

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Bazulin, E.G. Reducing the Level of Weakly Changing Noise by the Decorrelation Method during Ultrasonic Monitoring Using Antenna Arrays. Russ J Nondestruct Test 56, 310–317 (2020). https://doi.org/10.1134/S1061830920040026

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  • DOI: https://doi.org/10.1134/S1061830920040026

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