過去の学会誌一覧

Vol.33 No.3 通巻123号 (2006年/平成18年)

表彰 7(141)
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
Measurement of the Frequency Characteristics of the Scattering Amplitude Using the Dolphin's Sonar Signal
*1 Tomohito IMAIZUMI, Masahiko FURUSAWA (Tokyo University of Marine Science and Technology)
*2 Tomonari AKAMATSU (National Research Institute of Fisheries Engineering)
Abstract:
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.
今泉 智人, 古澤 昌彦, 赤松 友成 9(143)
2005年度第1回シンポジウム発表要旨 2005年水中防衛技術学会(UDT)報告
(その1)UDT Europe 2005(UDT Hawaii 2004含む)の概要
水野 鉄臣 17(151)
(その2)水中通信・航法 藤澤 國夫 21(155)
(その3)ソーナーシステム 深見 明久 25(159)
(その4)海洋音響環境 尾崎 俊二 29(163)
2005年度第2回シンポジウム発表要旨 森  和義 33(167)
水中音響標準調査部会報告会の概要
随想 魚群探知機のディジタル化への思い出 沖野 睦郎 40(174)
図書紹介 堀井  浩 42(176)
Paper Index 土屋 健伸, 森  和義 44(178)
会記事 48(182)