10.14489/td.2016.06.pp.021-035

2016, 06, June

DOI: 10.14489/td.2016.06.pp.021-035

Danilov V.N., Razygraev A.N., Kobernik A.V.
MODELING THE ACTIVITY OF A DIRECT DUAL PROBE
(pp. 21-35)

Abstract. On the basis of the algorithm of calculation of displacement of a longitudinal wave which is radiated the shear wave probe, the model of an acoustic channel of a base signal of dual probe was designed and the calculations for a series of versions of parameters of such probe were conducted. The intermediate task was solved for obtaining the formula of an acoustic channel. The signal amplitude of a longitudinal wave, which was radiated and registered by identical angle probes located from both parties of a parallel plate layer, was calculated. Usage of the method of the mirror-image presentations of the receiving part of dual probe concerning the lower boundary of a layer was allowed to reduce a problem of calculation of an acoustic channel of this probe to review as a case of a layer. The method of a fixed phase in a farfield region allowed to obtain the approximated (asymptotic) formula used in calculations. Matching the idealized relation of a base signal with the experimental values shown their coincidence in error limits of used computational model and experiment was conducted. It is shown the capabilities of sensitization of the dual probes on the different distances by an angular variation of wedges, by a variation of spacing interval between the piezoplates and its sizes, by change remoteness piezoplates from a surface of the control.

Keywords: dual probe, longitudinal wave, piezoplate, potential, focal point, near field, bottom echo, directivity characteristic, attenuation coefficient, probe axis.

+ - About the Authors Click to collapse

V. N. Danilov, A. N. Razygraev, A. V. Kobernik (JSC “RPA “CNIITMASH”, Moskow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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