海洋音響学会誌
Online ISSN : 1881-6819
Print ISSN : 0916-5835
ISSN-L : 0916-5835
研究
ハクジラのソーナー音を用いた散乱振幅の周波数特性の測定
今泉 智人古澤 昌彦赤松 友成
著者情報
キーワード: イルカ, 金属球, 散乱振幅
ジャーナル フリー

2006 年 33 巻 3 号 p. 143-150

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抄録

Dolphins detect, pursuit, and prey fish as their food by using their excellent sonar ability. If some advantages of their sonar such as object identification ability are introduced to our fisheries echo sounder, improvement should be possible because the purposes are similar. We focus on the wideband characteristics of dolphin's sonar in this study. We measured the frequency characteristics of the scattering amplitude of metal spheres and goldfish using the dolphin's sonar signal. We measured the absolute scattering amplitude of the metal spheres by the incident wave and the reflected wave by using sonar signals of bottlenose dolphin and finless porpoise. The measured scattering amplitudes agreed fairly well with the theoretical values in wideband. The scattering amplitudes of goldfish obtained in wideband were almost reasonable. These observations suggested that the dolphin possibly use the wideband scattering amplitude, which exhibits features of objects clearer than the echo spectrum, for the object identification.

著者関連情報
© 2006 特定非営利活動法人 海洋音響学会
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