Issues of ultrasonic testing of extended complexly structured items with strong attenuation of signals

Kachanov, V. K.; Соколов, И. В.

doi:10.1134/s1061830907080086

Cited by 13 publications

(2 citation statements)

References 2 publications

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“…The error in finding the frequency of the longitudinal wave's first mode increases, thereby reducing the reliability of the measurement results because the desired peak cannot be distinguished against a background of numerous other resonances forming a sort of noise disguising the useful signal. This noise can be called "noise of form" (in terms of noiseimmune ultrasonic testing of articles) (Kachanov, V.K. and Sokolov, I.V., 2007) because, on the one hand, it is the shape of a compact article that determines its AFC and, on the other hand, such an AFC with many peaks hinders determination of the sought resonance, i.e., is a sort of interference (noise) disguising the required article thickness.…”

Section: A Correlation Methods For Determining the Propagation Velocity Of An Acoustic Wave In Large-size Compact Concrete Articlesmentioning

confidence: 99%

Wave Propagation in Materials for Modern Applications

Petrin¹

2010

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as a Lecturer of General Physics. Since 1996, he has been with the Joint Institute for High Temperatures of Russian Academy of Sciences, Moscow, as a Leading Scientific Researcher of Theoretical Department. His scientific interests include propagation of electromagnetic waves, electrodynamics of plasma, gasdynamics, ECR microwave gas discharges, electrowetting phenomena, electric field singularities on geometric singularities such as microtips and microwedges, electric field induced instabilities of free fluid surface, nanofocusing of light energy, heat transfer in nanoscale. He is the author of more than 45 papers in scientific journals and 4 U.S. patents: www.petrin.nm.ru.

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Section: A Correlation Methods For Determining the Propagation Velocity Of An Acoustic Wave In Large-size Compact Concrete Articlesmentioning

confidence: 99%

Wave Propagation in Materials for Modern Applications

Petrin¹

2010

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“…6 первое вступление импульса продольной подповерхностной волны практически полностью маскируется шумами приемного усилителя и визуально не регистрируется, импульс поверхностной волны фиксируется надежно. Это позволяет предположить, что для типовых составов конструкционного бетона измерительная база поверхностного прозвучивания может быть увеличена до 2,0-2,5 м без потери точности оценки времени распространения импульса и без необходимости применения алгоритмов накопления сигнала и его корреляционной обработки [11].…”

Section: экспериментальное исследование процесса распространения волн зондирующего ультразвукового импульса продольной волны и волны релеunclassified

Multi-Wave Ultrasonic Control of Concrete

Снежков¹,

Леонович²

2017

Nauka teh.

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The existing non-destructive testing system of structure concrete is actually orientated on the usage of longitudinal acoustical waves. This is due to simplicity of technical realization for measuring velocity (time) of acoustical pulse propagation in bulk concrete. But a reverse side of simple measuring procedure is a loss of additional information on concrete which is contained in the accepted acoustical signal. Therefore usage of an ultrasonic concrete testing method is limited by assessment of its strength. Joint usage of several wave types, so-called multi-wave testing, allows to refine metrology parameters of the ultrasonic method and to gain more information while determining physical and mechanical properties of concrete in laboratory and in situ conditions. The paper considers testing of elongated concrete elements and structures by an ultrasonic pulsing method on the basis of longitudinal subsurface and Rayleigh waves. It has been proposed to use methodology for time selection of wave components according to amplitude parameter and it has been applied for standard acoustical transformers with considerable reverberation time and not possessing spatial selectivity Basic principle of the proposed methodology is visual (according to oscillogram of the received signal) determination of characteristic time moments which are used for calculation of differential value of a propagation velocity in the Rayleigh wave impulse. The paper presents results pertaining to simulation of acoustical pulse propagation on the basis of 0.15 m and data of concrete ultrasonic in situ testing on measuring bases from 0.25 to 1.75 m. Advantage of large baseline for sonic test is a possibility for execution of a hundred percent inspection for surface of large-sized elements and structures, and so there is no need to make a selective inspection in some control areas as it is stipulated by provided by existing regulations. Responsivity of the Rayleigh wave parameters to near surface concrete defects permits quickly and efficiently to detect crack areas in a reinforced structure. Energy localization of a surface wave in a layer having width λ/2–λ provides a possibility to ignore reinforcement availability under appropriate selection of oscillation frequency. In addition to this, large measuring baseline makes it possible to lower effect of concrete structural inhomogeneity on statistical stability for pulse velocity assessment that ultimately reveals a possibility to register an appearance of concrete acoustical elasticity effect under in situ conditions.

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