利用参考半径/相位效应来控制声索雷型波带片透镜中的焦点模式。

Manipulation of focal patterns in acoustic Soret type zone plate lens by using reference radius/phase effect.

机构信息

Centro de Tecnologías Físicas: Acústica, Materiales y Astrofísica, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain.

出版信息

Ultrasonics. 2019 Jan;91:237-241. doi: 10.1016/j.ultras.2018.07.022. Epub 2018 Aug 4.

DOI:10.1016/j.ultras.2018.07.022

PMID:30126723

Abstract

The manipulation of focal patterns of acoustic underwater Soret Zone Plate lens in far fields, such as manipulation (optimization) of Sidelobe Level and the design of long depth of focus by selecting the simple free parameter called reference radius (phase) has been demonstrated.Two effects have been studied by means of numerical simulations. Regarding the first effect, simulations demonstrate diffraction limited focal spot (0.47 wavelength) and 3 dB reduction of the first Side Lobe Level using Soret ZP with an optimal reference radius and without causing neither main lobe broadening or gain reduction. In the second effect, by using numerical simulations an increasing of depth of focus, more than 2 times, in comparison with classical Soret ZP with high numerical aperture (F/D = 2.5), was observed.

摘要

已经证明，可以在远场中操纵水下 Soret 带板透镜的焦斑模式，例如通过选择称为参考半径（相位）的简单自由参数来操纵（优化）旁瓣电平并设计长景深。通过数值模拟研究了两种效应。关于第一个效应，模拟结果表明，使用具有最佳参考半径的 Soret ZP 可以获得衍射受限的焦点光斑（0.47 波长）和第一旁瓣电平降低 3dB，而不会导致主瓣展宽或增益降低。在第二个效应中，通过数值模拟观察到，与具有高数值孔径（F/D=2.5）的传统 Soret ZP 相比，景深增加了两倍以上。