10.14489/td.2015.04.pp.018-028

2015, 04 April

DOI: 10.14489/td.2015.04.pp.018-028

Danilov V.N.
ABOUT SOME FEATURES OF FORMATION OF SIGNALS AND DEFINITION OF THE SIZE OF A NEAR FIELD FOR A NORMAL PROBES WITH PIEZOELECTRIC PLATES AND PHASED ARRAYS. Part 1
(pp. 18-28)

Abstract. It is analyzed the comparison versions of defining of the size of a near zone of direct converses with conventional (solid) piezoelectric plates of circleand rectangular shapes usingthe formula of prof. I. N. Ermolov (standard ratio), expressions of this size for the strongly prolated rectangular plate and used in eurostandart EN 12668-2. It is estimated the spacing intervals of formation of the directivity charac-teristic of probes and relations changes in the amplitude of the signal, close to limiting for the far zone in the sizes of the near zone. These fea-tures of the signal of a direct converter with piezoelectric plate can be used to estimate the position of the far field of the transducer with the phased array in the absence of interference maxima and minima of a signal on a probe axis.

Keywords: normal probe, rectangular piezoelectric plate, size of a near field, far field, directivity characteristic, decreasing of a signal amplitude on a probe axis, last maximum, correcting factor.

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

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9. Danilov V. N. (2014). Definition of the size of a near-field region of the angle beam probe with round piezoelement. Kontrol'. Diagnostika, (8), pp. 28-34. doi: 10.14489/td.2014.08.pp.028-034.

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DOI: 10.14489/td.2015.04.pp.018-028

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