10.14489/td.2025.07.pp.015-022

2025, 07 July

DOI: 10.14489/td.2025.07.pp.015-022

Danilov V. N.
ON THE CHANGE IN THE AMPLITUDE OF THE BOTTOM ECHO WITH A DISTANCE FOR STANDARD NORMAL PROBES
(pp. 15-22)

Abstract. Based on computer modeling of the electro-acoustical channel of the flaw detector for standard normal probes for the steel sample, taking into account the presence of a contact liquid layer, the dependences of the change in the amplitude of the bottom echo reflected from the flat surface are determined. It is shown that the dependences of the bottom echo of standard normal probes lie above the dependence calculated using the scalar (simplified) model for values consistent with the previously obtained results. It was found that taking into account the presence of a layer of contact liquid that lowers the operation frequency of the probe leads to a slight change in the value of the bottom echo, which does not qualitatively affect the previously made conclusions on the study of the dependence of the amplitude of the bottom echo on distance. The determination of the diffraction attenuation of the bottom echo in steel for standard normal probes, taking into account the presence of a contact liquid layer, can be carried out according to the dependence of the bottom echo previously recommended for practical use with permissible variations in the wave parameter of the piezoelectic plate.

Keywords: bottom echo, normal probe, near field, far field, contact liquid layer, electro-acoustical channel, operation frequency, wave parameter of the piezoelectic plate.

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

+ - References Click to collapse

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