10.14489/td.2022.04.pp.004-012

2022, 04 April

DOI: 10.14489/td.2022.04.pp.004-012

Danilov V. N.
ABOUT INFLUENCE OF PARAMETERS OF A WEAR PLATE OF THE NORMAL PROBE ON CHARACTERISTICS FREQUENCY A SPECTRUM AND A PULSE OF A BOTTOM SIGNAL
(pp. 4-12)

Abstract. Computer modelling of an acoustic channel of the normal probe for a reflector as a bottom surface has shown, that increase of amplitude of a pulse echo signal, registered by the probe with a wear plate from epoxy resin with fine – dispersed filler due to increase of its contents, causes reduction of speed of longitudinal waves in a wear plate with the appropriate downturn of the first resonant frequency owing to what the spectrum of a signal may vary essentially. Reception of short pulses, on amplitude of same duration considerably surpassing pulses for protectors from epoxy resin with filler, is provided with application of a protector from mineral ceramics, having own lowest resonant frequency is much higher than the basic own frequency piezo plate. Comparison of experimental and theoretical pulses and spectra of ground signals for direct converters with qualitatively distinguished protectors has confirmed an opportunity of presence of the several expressed maxima of a spectrum of a pulse with oscillating modulation of amplitude for a wear plate from epoxy resin with filler with low speed of distribution of longitudinal waves.

Keywords: normal probe, pulse, spectrum, mineral ceramics, bottom signal, thick-ness piezo plate, wear plate, longitudinal wave, characteristic impedance, contents of tungsten.

+ - About the Authors Click to collapse

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

1. Isaenko F. I., Sahlin V. V., Kopanskiy A. G., Dimitrov T. V. (1983). Piezoelectric transducers for non-destructive testing devices. Defektoskopiya, (10), pp. 46 – 52. [in Russian language]
2. Danilov V. N., Voronkov V. A., Izofatova N. Yu. (1996). Investigation of the amplitude-frequency characteristic of the acoustic path of the radiating direct transducer. Defektoskopiya, (3), pp. 37 – 45. [in Russian language]
3. Danilov V. N. (1996). On the effect of the thickness of the couplant layer on the characteristics of elastic waves emitted by a direct transducer. Defektoskopiya, (6), pp. 23 – 29. [in Russian language]
4. Danilov V. N., Izofatova N. Yu., Voronkov V. A. (1997). Comparison of theoretical and experimental results of the study of the operation of direct combined converters. Defektoskopiya, (6), pp. 39 – 49. [in Russian language]
5. Danilov V. N. (2006). The program for computer simulation of the operation of electroacoustic paths of flaw detectors "IMPULSE +". Defektoskopiya, (3), pp. 37 – 43. [in Russian language]
6. Danilov V. N. (1996). Study of the effect of tread parameters on the characteristics of longitudinal waves emitted by a direct transducer. Defektoskopiya, (10), pp. 11 – 17. [in Russian language]
7. Danilov V. N. (2008). On the issue of using quarterwave matching protectors in direct converters. Defektoskopiya, (5), pp. 66 – 78. [in Russian language]
8. Danilov V. N., Korolev V. D. (2002). On the issue of choosing the parameters of protectors of direct combined converters. Defektoskopiya, (1), pp. 71 – 77. [in Russian language]
9. Klyuev V. V. (Ed.), Ermolov I. N., Lange Yu. V. (2006). Ultrasonic control. Non-destructive testing: handbook: in 8 volumes. Vol. 3. 2nd ed. Moscow: Mashinostroenie. [in Russian language]
10. Danilov V. N. (2021). On the characteristics of the signal characteristics of an inclined transducer with a composite piezoelectric plate and various types of piezoceramics. Kontrol'. Diagnostika, (2), pp. 6 – 16. [in Russian language] DOI 10.14489/td.2021.02.pp.006-016

+ - Purchase digital version of a single article Click to collapse

This article is available in electronic format (PDF).

The cost of a single article is 500 rubles. (including VAT 20%). After you place an order within a few days, you will receive following documents to your specified e-mail: account on payment and receipt to pay in the bank.

After depositing your payment on our bank account we send you file of the article by e-mail.

To order articles please copy the article doi:

10.14489/td.2022.04.pp.004-012

and fill out the form