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DOI: 10.14489/td.2015.09.pp.010-027
Bazulin E.G., Vopilkin A.H., Tihonov D.S.
IMPROVED RELIABILITY OF ULTRASONIC INSPECTION. Part 2
(pp. 10-27)
Abstract. The article discusses methods of improving the signal-noise ratio in coherent reconstruction of reflectors image based on coherent ac-cumulation of the useful signal. The effectiveness of complex signals to improve the signal-noise ratio at low level of the useful signal was demonstrated. To reduce the level of structural noise we suggested using the echo processing techniques in order to achieve the super-resolution effect. The effectiveness of reconciliation of maximum entropy method to restore the image of reflectors on a set of echoes in the object with structural noise was demonstrated. Restoring the image of flaw by C-SAFT method reduces the impact of indirect reflections. To account for the effect of re-reflected signal between defects we proposed a technique that uses the method of least squares and the method of maximum entropy. Evaluation of the scattered field is held with the expansion of the field in the Bourne series. We also gave examples of these algorithms with the analysis of the reconstructed images.
Keywords: ultrasonic nondestructive testing, antenna arrays, prisms, dual scanning, FMC, C-SAFT, TFM, digital focusing array (DFA), structural noise, superresolution, complex signals, maximum entropy method (MEM), method of con-structing a model AR-echo spectrum and method of splitting the spectrum.
E. G. Bazulin, A. H. Vopilkin, D. S. Tikhonov
SPC “ECHO+”, Moscow, Russia. E-mail:
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