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- Title
Validation of multi-frequency inversion method by using dummy scatterers of zooplankton.
- Authors
Hwang, Bo-Kyu; Furusawa, Masahiko; Ogata, Masaki
- 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 multi-frequency system. By comparing the result of the inversion with their real composition, the features of the MFI method could be validated and examined.
- Subjects
PHYSICAL measurements; CALIBRATION; ZOOPLANKTON; BACKSCATTERING; SCATTERING (Physics); TUNGSTEN compounds; CARBIDES; CHROMOSOME inversions; DEVELOPMENTAL biology
- Publication
Fisheries Science, 2007, Vol 73, Issue 2, p250
- ISSN
0919-9268
- Publication type
Article
- DOI
10.1111/j.1444-2906.2007.01331.x