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首页> 外文期刊>ICES Journal of Marine Science >Wideband (15-260 kHz) acoustic volume backscattering spectra of Northern krill (Meganyctiphanes norvegica) and butterfish (Peprilus triacanthus)
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Wideband (15-260 kHz) acoustic volume backscattering spectra of Northern krill (Meganyctiphanes norvegica) and butterfish (Peprilus triacanthus)

机译：北磷虾（Meganyctiphanes norvegica）和butter鱼（Peprilus triacanthus）的宽带（15-260 kHz）声波后向散射谱

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Measurements of acoustic backscatter made over a wide frequency band have the potential for improved classification relative to traditional narrowband methods, by characterizing more fully the frequency response of scatterers. In January 2014, five wideband transceivers [Simrad EK80 Wideband Transceivers (WBTs)] and split-beam transducers with nominal centre frequencies of 18, 38, 70, 120, and 200 kHz were used to collect acoustic data spanning a nearly continuous 15-260 kHz bandwidth. The acoustic samples were from ca. 2 m below the surface to the seabed in an area along the US continental shelf break. Bottom trawls and zooplankton nets were also used to sample scatterers contributing to selected features of the acoustic backscatter. Measurements of frequency-dependent volume backscattering strength (i.e. volume backscattering spectra) from aggregations of euphausiids (mostly Northern krill, Meganyctiphanes norvegica) clearly resolved the transition from Rayleigh to geometric scattering, consistent with modelled backscatter from the type and length of animals sampled with bongo nets. Volume backscattering spectra from aggregations dominated by butterfish (Peprilus triacanthus) revealed a frequency response that was suggestive of superimposed scattering by soft tissue and bone. Backscatter predicted by Kirchhoff ray mode models of butterfish corresponded to trends in the measured spectra, supporting the assumption that acoustic scattering by butterfish is dominated by soft tissue and vertebrae.
机译：通过更充分地表征散射体的频率响应，相对于传统的窄带方法，在宽频带上进行的声学反向散射测量具有改进分类的潜力。 2014年1月，使用了五个宽带收发器[Simrad EK80宽带收发器（WBT）]和标称中心频率分别为18、38、70、120和200 kHz的分束式传感器，收集了几乎连续的15-260声数据kHz带宽。声学样品来自约。美国大陆架断裂带海床以下2 m。底部拖网和浮游动物网也被用于采样散射体，这些散射体有助于声学反向散射的选定特征。对虾e的聚集体（主要是北磷虾，巨夜蛾）的频率依赖性体积后向散射强度（即体积后向散射光谱）的测量清楚地解决了从瑞利散射到几何散射的转变，这与从邦戈取样的动物的类型和长度建模的反向散射一致网。由butter鱼（Peprilus triacanthus）为主的聚集体的体积反向散射光谱揭示了频率响应，暗示了软组织和骨骼的叠加散射。白butter的Kirchhoff射线模式模型预测的反向散射与测得的光谱趋势相对应，支持了白butter的声散射主要由软组织和椎骨主导的假设。

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