Practical application of a triaxial intensity array
Young, V.W., Hines, P.C., Hutt, D.L. and Humphrey, V.H. (2003) Practical application of a triaxial intensity array. Journal of the Acoustical Society of America, 114, (4), 2427.
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Description/Abstract
Sound intensity is a vector quantity representing the magnitude and direction of propagating energy within an acoustic field. In an underwater environment, a single omnidirectional hydrophone can be used to measure instantaneous acoustic pressure and a finite difference approximation applied to the pressure signals from a pair of such hydrophones can be used to calculate particle velocity in a single direction. Because the time average of the product of instantaneous pressure and particle velocity is intensity, a pair of hydrophones is all that is required to measure a single component of the intensity vector. The complete threedimensional intensity vector can be calculated using three orthogonal pairs of hydrophones. To evaluate this concept a triaxial array consisting of three orthogonal pairs of omnidirectional hydrophones has been developed and tested on both calibrated sources at a laboratory facility and sources of opportunity during sea trails in littoral waters. The use of this array to calculate the intensity vector and thereby localize both nearfield and farfield acoustic sources and characterize the directionality of ambient noise fields will be discussed. The impact of signaltonoise ratio and the effect of selfnoise will also be examined.
Item Type:  Article  

Related URLs:  
Subjects:  T Technology > T Technology (General) Q Science > QC Physics 

Divisions:  University Structure  Pre August 2011 > Institute of Sound and Vibration Research > Fluid Dynamics and Acoustics 

ePrint ID:  10339  
Date : 


Date Deposited:  23 Aug 2005  
Last Modified:  31 Mar 2016 11:16  
URI:  http://eprints.soton.ac.uk/id/eprint/10339 
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