Finite difference time domain analysis of underwater acoustic lens system for ambient noise imaging

被引:21
作者
Mori, K
Miyazaki, A
Ogasawara, H
Yokoyama, T
Nakamura, T
机构
[1] Natl Def Acad, Dept Earth & Ocean Sci, Yokosuka, Kanagawa 2398686, Japan
[2] Natl Def Acad, Grad Sch Sci & Engn, Yokosuka, Kanagawa 2398686, Japan
来源
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2006年 / 45卷 / 5B期
关键词
ambient noise imaging; acoustic lens; FDTD method; focusing characteristics; aperture size;
D O I
10.1143/JJAP.45.4834
中图分类号
O59 [应用物理学];
学科分类号
摘要
Much attention has been paid to the new idea of detecting objects using ocean ambient noise. This concept is called ambient noise imaging (ANI). In this study, sound fields focused by an acoustic lens system constructed with a single biconcave lens were analyzed using the finite difference time domain (FDTD) method for realizing an ANI system. The size of the lens aperture that would have sufficient resolution-for example, the beam width is 1 degrees at 60kHz - was roughly determined by comparing the image points and -3 dB areas of sound pressure fields generated by lenses with various apertures. Then, in another FDTD analysis, we successfully used a lens with a determined aperture to detect rigid target objects in an acoustic noise field generated by a large number of point sources.
引用
收藏
页码:4834 / 4841
页数:8
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