DocumentCode :
3359395
Title :
Development of a high frequency underwater acoustic intensity probe
Author :
McConnell, James A. ; Weber, Thomas C. ; Lauchle, Gerald C. ; Gabrielson, Thomas B.
Author_Institution :
Acoustech Corp., State College, PA, USA
Volume :
4
fYear :
2002
fDate :
29-31 Oct. 2002
Firstpage :
1924
Abstract :
The development of an underwater acoustic intensity probe for high frequency applications (e.g., f ∼ 10 kHz) is presented. The probe measures the acoustic pressure along with two orthogonal components of the particle acceleration; hence, the probe relies on inertial sensing as opposed to a gradient technique. The acoustic pressure is measured with a ring hydrophone that is capped at both ends. The accelerometers are positioned within the internal cavity created by the hydrophone and are oriented to measure sound in the horizontal plane. The probe is negatively buoyant, contains a viscoelastic suspension system, and is positioned within a free-flooding stainless steel cage that contains extensional damping treatments and exhibits a low scattering cross-section. Negative buoyancy results from making the probe small so that it does not scatter the acoustic field over the frequency range of interest nor exhibit any in-band structural modes. The consequence of this action translates into an in-water acceleration sensitivity that is reduced by a factor of two relative to the intrinsic value. The hydrophone has an omni-directional beam pattern and the accelerometers have dipole directivity. Lumped parameter circuit models will be preesented along with performanc data.
Keywords :
accelerometers; acoustic intensity measurement; acoustic transducers; oceanographic equipment; underwater sound; viscoelasticity; accelerometer; acoustic pressure measurement; dipole directivity; free-flooding stainless steel cage; gradient technique; high frequency application; horizontal plane; in-band structural mode; in-water acceleration sensitivity; inertial sensing; internal cavity; intrinsic value; lumped parameter circuit model; negative buoyancy; omni-directional beam pattern; orthogonal component; particle acceleration; ring hydrophone; scattering cross-section; underwater acoustic intensity probe; viscoelastic suspension system; Accelerometers; Acoustic measurements; Acoustic scattering; Frequency; Particle measurements; Particle scattering; Pressure measurement; Probes; Sonar equipment; Underwater acoustics;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
OCEANS '02 MTS/IEEE
Print_ISBN :
0-7803-7534-3
Type :
conf
DOI :
10.1109/OCEANS.2002.1191926
Filename :
1191926
Link To Document :
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