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Multiple scattering in a reflecting cavity: Application to fish counting in a tank

J. Acoust. Soc. Am. Volume 109, Issue 6, pp. 2587-2597 (June 2001)

Issue Date: June 2001
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Julien De Rosny and Philippe Roux
Laboratoire Ondes et Acoustique, ESPCI, Université Paris VII, 10 rue Vauquelin, 75005 Paris, France
Classical fisheries acoustics techniques are useless in the presence of multiple scattering or reflecting boundaries. A general technique is developed that provides the number and the scattering strength of scatterers in motion placed inside a highly reflecting cavity. This approach is based on multiple scattering theory. The idea is to measure the average effect of the scatterers on the acoustic echoes of the cavity interfaces. This leads to the measure of the scattering mean free path, a typical length that characterizes the scattering strength of the cloud of scatterers. Numerical results are shown to agree with a simple theoretical analysis. Experiments are performed with fish in a tank at two different scales: ultrasonic frequency (400 kHz) in a 1.4-1 beaker with 1-cm-long fish as well as fisheries acoustics frequency (12.8 kHz) in a 30-m3 tank with 35-cm-long fish. These results have interesting applications to fish target strength measurement and fish counting in aquaculture. ©2001 Acoustical Society of America.
History: Received 21 August 2000; revised 6 February 2001; accepted 6 March 2001
Permalink: http://dx.doi.org/10.1121/1.1369101

EDITORIALLY RELATED

  1. Comment on "Multiple scattering in a reflecting cavity: Application to fish counting in a tank" [J. Acoust. Soc. Am. 109, 2587–2597 (2001)] (L)
    Zhen Ye et al.
    J. Acoust. Soc. Am. 113, 2978 (2003)

KEYWORDS and PACS

Keywords
PACS
  • 43.20.El
    Acoustics General linear acoustics Reflection, refraction, diffraction of acoustic waves
  • 43.30.Gv
    Acoustics Underwater sound Backscattering, echoes, and reverberation in water due to combinations of boundaries
  • 43.80.Ev
    Acoustics Bioacoustics Acoustical measurement methods in biological systems and media
  • YEAR: 2001

PUBLICATION DATA

ISSN:
0001-4966 (print)  
Publisher:
AIP is a member of CrossRef ASA

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