Refracting Sound Waves
作者:
Winston E. Kock,
F. K. Harvey,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1949)
卷期:
Volume 21,
issue 5
页码: 471-481
ISSN:0001-4966
年代: 1949
DOI:10.1121/1.1906536
出版商: Acoustical Society of America
数据来源: AIP
摘要:
Structures are described which refract and focus sound waves. They are similar in principle to certain recently developed electromagnetic wave lenses in that they consist of arrays of obstacles which are small compared to the wave‐length. These obstacles increase the effective density of the medium and thus effect a reduced propagation velocity of sound waves passing through the array. This reduced velocity is synonymous with refractive power so that lenses and prisms can be designed. When the obstacles approach a half wave‐length in size, the refractive index varies with wave‐length and prisms then cause a dispersion of the waves (sound spectrum analyzer). Path length delay type lenses for focusing sound waves are also described. A diverging lens is discussed which produces a more uniform angular distribution of high frequencies from a loud speaker.
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