Beam focusing behavior of linear phased arrays

被引：171

作者：

Azar, L ^{[1
]}

Shi, Y ^{[1
]}

Wooh, SC ^{[1
]}

机构：

[1] MIT, Dept Civil & Environm Engn, Cambridge, MA 02139 USA

来源：

NDT & E INTERNATIONAL | 2000年 / 33卷 / 03期

关键词：

ultrasonic phased array transducers; dynamic focusing; beam directivity; numerical simulation; imaging;

D O I：

10.1016/S0963-8695(99)00043-2

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

One of the fundamental features of phased arrays is the ability to focus the propagating waves to a specific point within the load material by inducing a parabolic time delay. This required focusing time delay has been modified from the current formulation to incorporate either an odd or even number of elements. A brief procedure leading to the derivation of the pressure distribution for beam focusing is described, which gives rise to an unclosed form. Consequently, a numerical method is desirable for the analysis of beam focusing. Using this approach, beam directivity and pressure distributions are studied to predict the behavior of focusing as compared to steering. This shows a benefit of focusing over steering within the near field of the array, and that the directivity of focusing converges to that of steering in the far field. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：189 / 198

页数：10

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