14KC音響測深機とそれと同一機構を有する試作極超音波音響測深機による海底記録像の比較(日本航海学会第21回講演会)

DOI Web Site Web Site

書誌事項

タイトル別名
  • Comarison between the Echo-trace of Sea-bottom by the 14kc Echo-sounder and that by the Echo-sounder of Ultra High Frequency Sound Wave which has the Same Mechanism as the 14kc Echo-sounder
  • 14KC音響測深機とそれと同一機構を有する試作極超音波音響測深機による海底記録像の比較
  • 14KC オンキョウ ソクシンキ ト ソレ ト ドウイツ キコウ オ ユウスル シサクキョク チョウオンパ オンキョウ ソクシンキ ニ ヨル カイテイ キロクゾウ ノ ヒカク

この論文をさがす

抄録

We published that the echo-trace of the sea-bottom obtained by the 200kc echosounder with sharp beam is much more similar to the true shape than that by the lower frequency echo-sounder. We made a 200kc echo-sounder, the sounding range, the recording paper speed and the width of paper of which were the same as those of 14kc echosounder and made an experiment by these two echo-sounders on the sea off Kurihama, Kanagawa Prefecture, on 24th April 1959. We installed the 14kc and 200kc transducers on one side of the ship in order to avoid the change which the echo-traces underwent by the installation. There is no appreciable difference for the even bottom but differences come out as the shape of bottom becomes complicated. In case of 14kc it is often that one cannot measure the depth of the sea-bottom because many false bottoms are recorded on account of the dull beam, but in case of 200kc it is easy to measure the depth of the sea-bottom because nothing but the bottom is recorded and the accuracy of sounding is high on account of the sharp beam. In case of 14kc, the accuracy of sounding might be high if its beam is made as sharp as that of 200kc, but it is not practical because a very large transducer is necessary. A sharp beam is much more easily obtained by the high frequency than by the low one.

収録刊行物

詳細情報 詳細情報について

問題の指摘

ページトップへ