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DOI: 10.14489/td.2015.08.pp.007-022
Bazulin E.G., Vopilkin A.H., Tihonov D.S.
IMPROVED RELIABILITY OF ULTRASONIC INSPECTION. PART 1
(pp. 7-22)
Abstract. One of the main problems of ultrasonic testing is a solution of classification of detected flaw. Known attempts to solve this problem the selection of a configuration of transmitting and receiving, taking into account the reflection and transformation of types of waves, in the best case allow solve the problem for special cases. The article briefly reviewed the modification algorithm Combined Synthetic Aperture Focusing Technique (C-SAFT), allowing to obtain a lot partial images of the same area of the object formed by different control configurations of the transmitting-receiving elements of the two oppositely directed phased arrays. Maximum entropy method, which can be used for processing individual echoes to achieve super-resolution and for processing a set of echo, is proposed to obtain images reflectors. In most cases a priori known information about the physical properties of the object, such as its internal geometry (e.g., thickness variation), different elastic properties of the two welded materials (e.g., dissimilar welds) or anisotropy of these properties in the control can be correctly taken into account in restoration image reflectors. This significantly increased information value, as is possible to obtain images with higher resolution, low-noise and false reflections with low amplitude. Proposed approach opens up a whole new range of opportunities for different tasks of ultrasonic testing, including the problem of determining the type of discontinuity. The article gives examples of reconstructed images of these algorithms.
Keywords: ultrasonic nondestructive testing, antenna arrays, prisms, dual scanning, FMC, C-SAFT, TFM, digital focusing array (DFA), superresolution, anisotropy, maximum entropy method.
E. G. Bazulin, A. H. Vopilkin, D. S. Tikhonov
SPC “ECHO+”, Moscow, Russia. E-mail:
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