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Physical model of acoustic forward scattering by cylindrical shell and its experimental validation |
Lei Bo(雷波)†, Yang Kun-De(杨坤德), and Ma Yuan-Liang(马远良) |
College of Marine, Northwestern Polytechnical University, Xi'an 710072, China |
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Abstract Research on the underwater target scattering can provide important theoretical support for target detection. The scattering model of cylindrical shell is established in this paper. It is found that the forward target strength is much stronger and varies with angles of incident wave less significantly than backward target strength. The received forward signal strength fluctuates with the target moving due to the interference between direct signal and scattering signal, which is most significant when target approaches the baseline. An experiment is carried out in an anechoic tank to validate the scattering model. The method of acquisiting forward scattering in the tank is proposed. The forward and the backward target strengths are achieved by using the pulse compression technology, and they are about 3dB less than the modeling results. The forward scattering phenomena of quiescent and moving target are measured, which are similar to modeling results with different target types.
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Received: 13 September 2009
Revised: 23 October 2009
Accepted manuscript online:
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PACS:
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43.30.Ft
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(Volume scattering)
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43.30.Es
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(Velocity, attenuation, refraction, and diffraction in water, Doppler effect)
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Fund: Project supported by the National
Natural Science Foundation of China (Grant No.~10774119), the
program for New Century Excellent Talents in University, China
(Grant No.~NCET-08-0455), the Natural Science Foundation of Shaanxi
province, China (Grant No. SJ08F07), the Foundation of National
Laboratory of Acoustics, and the Northwestern Polytechnical
University NPU Foundation for Fundamental Research, China (Grant
No.~2007004). |
Cite this article:
Lei Bo(雷波), Yang Kun-De(杨坤德), and Ma Yuan-Liang(马远良) Physical model of acoustic forward scattering by cylindrical shell and its experimental validation 2010 Chin. Phys. B 19 054301
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