Document Detail


Characteristics of sound pressure field focused by an acoustic aplanat lens.
MedLine Citation:
PMID:  18532028     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
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.
Authors:
Toshiaki Nakamura; Yuji Sato; Ayano Miyazaki; Kazuyoshi Mori
Related Documents :
24289418 - Triaxial testing system for pressure core analysis using image processing technique.
2354048 - Evaluation of radon mitigation systems in 14 houses over a two-year period.
3624648 - The development of skill in producing word-final english stops.
933358 - Influence of heart rate and age on q-korotkoff sound intervals.
9119428 - Age and sex variation of blood pressure in the population of andhra pradesh.
8988828 - Negative pressure induced airway and pulmonary injury.
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    
Affiliation:
National Defense Academy, 1-10-20 Hashirimizu, 239-8686 Yokosuka, Japan, toshiaki@nda.ac.jp.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Acoustic methods in extremely shallow water: validity of the far field approximation.
Next Document:  A hydrophone calibration centre for the Mediterranean area.