Document Detail

Characteristics of sound pressure field focused by an acoustic aplanat lens.
MedLine Citation:
PMID:  18532028     Owner:  NLM     Status:  In-Data-Review    
In this paper, we describe the characteristics of an acoustic aplanat lens which can eliminate both spherical and coma aberrations. A singlet aplanat lens was designed using a ray theory in paraxial area. Sound pressure fields of the bi-concave aplanat lens and a spherical lens with 160 mm in diameter for the frequency of 500 kHz were evaluated by a three-dimensional finite difference time domain (3-D FDTD) method. The aplanetic lens showed better convergence characteristics than spherical lens. Two bi-concave lenses of aplanat and spherical lenses were made by acrylic resin and water tank experiment was conducted to compare the on-axis characteristics and beam patterns at the focus of them. As a result, the aplanat lens could focus higher sound pressure than the spherical one within the incident angle of 10 degrees.
Toshiaki Nakamura; Yuji Sato; Ayano Miyazaki; Kazuyoshi Mori
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  123     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-06-05     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3752     Citation Subset:  IM    
National Defense Academy, 1-10-20 Hashirimizu, 239-8686 Yokosuka, Japan,
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