Document Detail


Theory of compact nonporous windscreens for infrasonic measurements.
MedLine Citation:
PMID:  20550233     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The principle of the compact nonporous windscreen is based on the great penetrability of infrasound through matter. The windscreen performance is characterized by the ratio of the sound pressure at an interior microphone, located in the center of a windscreen, to the incident sound pressure in the free field. The frequency dependence of this pressure ratio is derived as a function of the windscreen material and geometric properties. Four different windscreen geometries are considered: a subsurface, box-shaped windscreen, a cylindrical windscreen of infinite length, a cylindrical windscreen of finite length, and a spherical windscreen. Results are presented for windscreens made of closed-cell polyurethane foam and for typical dimensions of each of the above geometries. The cylindrical windscreen of finite length, featuring evanescent radial modes, behaves as a unity-gain, low-pass filter, cutting off sharply at the end of the infrasonic range. The remaining geometries reveal a pass band that extends well into the audio range, terminated by a pronounced peak beyond which the response plummets rapidly.
Authors:
Allan J Zuckerwar
Related Documents :
23916003 - Method for relating the centre of pressure locus during dynamic stance to the anatomica...
22300373 - Formation of nanometer-sized surface platinum oxide clusters on a stepped pt(557) singl...
2450243 - Prejunctional and postjunctional effects of neuropeptide y at the noradrenergic neuroef...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  127     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-06-16     Completed Date:  2010-10-19     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3327-34     Citation Subset:  -    
Affiliation:
Analytical Services and Materials, 107 Research Drive, Hampton, Virginia 23666, USA.
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:  Finite-element modeling of depth and range dependent acoustic propagation in oceanic waveguides.
Next Document:  Meteorological influence on sound propagation between adjacent city canyons: A real-life experiment.