Laboratory applications of truncated parametric arrays (A)
Laboratory applications of truncated parametric arrays (A)
Parametric arrays have characteristics that make them ideally suited for use as versatile sources in the laboratory for performing a range of measurements and acoustic studies. Such measurements can exploit the wideband character of the source to provide detailed acoustic response characteristics of systems as a function of frequency, while the short pulses and narrow beamwidths enable multiple reflections and unwanted echoes to be resolved or minimized. However, the need to make measurements in the nearfield of the array means that truncation of the nonlinear interaction region with an acoustic low-pass filter is advisable in order to generate a region free of secondary-sources and simplify the interpretation of the results. This truncation also avoids the possible influence of hydrophone nonlinearity. The effects of truncation on the array characteristics are illustrated using both model and experimental results. A number of examples of the use of arrays in the laboratory are given, including their use to study acoustic scattering from structures and diffraction from baffles, and measurement of reflection and transmission properties of materials. These demonstrate how the characteristics of parametric arrays can be exploited to make detailed, accurate measurements of relevance to underwater acoustics under laboratory conditions
parametric arrays, interaction of sound with sound, virtual sources
2689-2689
Humphrey, Victor F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
April 2009
Humphrey, Victor F.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Humphrey, Victor F.
(2009)
Laboratory applications of truncated parametric arrays (A).
Journal of the Acoustical Society of America, 125 (4), .
Abstract
Parametric arrays have characteristics that make them ideally suited for use as versatile sources in the laboratory for performing a range of measurements and acoustic studies. Such measurements can exploit the wideband character of the source to provide detailed acoustic response characteristics of systems as a function of frequency, while the short pulses and narrow beamwidths enable multiple reflections and unwanted echoes to be resolved or minimized. However, the need to make measurements in the nearfield of the array means that truncation of the nonlinear interaction region with an acoustic low-pass filter is advisable in order to generate a region free of secondary-sources and simplify the interpretation of the results. This truncation also avoids the possible influence of hydrophone nonlinearity. The effects of truncation on the array characteristics are illustrated using both model and experimental results. A number of examples of the use of arrays in the laboratory are given, including their use to study acoustic scattering from structures and diffraction from baffles, and measurement of reflection and transmission properties of materials. These demonstrate how the characteristics of parametric arrays can be exploited to make detailed, accurate measurements of relevance to underwater acoustics under laboratory conditions
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Published date: April 2009
Additional Information:
Program abstracts of the 157th Meeting of the Acoustical Society of America
Keywords:
parametric arrays, interaction of sound with sound, virtual sources
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Local EPrints ID: 79031
URI: http://eprints.soton.ac.uk/id/eprint/79031
ISSN: 0001-4966
PURE UUID: 5dfe9424-b852-436a-a2af-4eced545aa72
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Date deposited: 17 Mar 2010
Last modified: 11 Dec 2021 03:54
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