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Validation of multi-frequency inversion method by using dummy scatterers of zooplankton

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Abstract

High- and multi-frequency acoustic measurement systems and the multi-frequency inversion (MFI) method have been used to measure spatial distributions and abundances of zooplankton by size. In this study, the calibration method for high- and multi-frequency systems was developed and the validation of MFI method was carried out by scatterer measurement. The standard sphere calibration method that has not been applied to such high- and multi-frequencies was applied to calibrate our high- and multi-frequency system, TAPS-6 (Tracor Acoustic Profiling System, BAE Systems). An optimum size of standard sphere of tungsten carbide of 1 mm radius was derived to have a small target strength variation for the six frequencies of TAPS-6, and the practicability and precision of the standard sphere calibration method was confirmed for those frequencies. A school or cluster of dummy scatterers of zooplankton with small tungsten carbide spheres were designed to validate the MFI method, and volume back-scattering strength values were measured by the multifrequency system. By comparing the result of the inversion with their real composition, the features of the MFI method could be validated and examined.

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Authors and Affiliations

  1. Department of Ocean Science, Tokyo University of Marine Science and Technology, Minato, 108-8477, Tokyo, Japan

    Bo-Kyu Hwang & Masahiko Furusawa

  2. Furuno Electric Co, 662-8580, Nishinomiya, Japan

    Masaki Ogata

Authors
  1. Bo-Kyu Hwang
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  2. Masahiko Furusawa
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  3. Masaki Ogata
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Hwang, BK., Furusawa, M. & Ogata, M. Validation of multi-frequency inversion method by using dummy scatterers of zooplankton. Fish Sci 73, 250–262 (2007). https://doi.org/10.1111/j.1444-2906.2007.01331.x

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  • DOI: https://doi.org/10.1111/j.1444-2906.2007.01331.x

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