On parametric source aperture factors
作者:
Mark B. Moffett,
Robert H. Mellen,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1976)
卷期:
Volume 60,
issue 3
页码: 581-583
ISSN:0001-4966
年代: 1976
DOI:10.1121/1.381131
出版商: Acoustical Society of America
关键词: 2535;2030;3075
数据来源: AIP
摘要:
It is well known that the beam pattern of a parametric acoustic source whose difference frequency is generated largely within the nearfield of the primary beam includes a multiplicative aperture factor that can be important at large angles when ka≳1 (kis the difference frequency wave number,ais the aperture radius). Not so well known, however, is the fact that the same aperture factor arises in the case of a spherically spreading, conical primary beam of finite initial aperture. The importance of the aperture size in determining the off‐axis behavior of parametric sources is discussed.Subject Classification: [43]25.35; [43]20.30; [43]30.75.
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