Cableを用いた超音波水中情報観測装置(日本航海学会第28回講演会)

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書誌事項

タイトル別名
  • Supersonic Observing Apparatus using Long-distance Cable for Underwater Information
  • Cableを用いた超音波水中情報観測装置
  • Cable オ モチイタ チョウオンパ スイチュウ ジョウホウ カンソク ソウチ

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抄録

This supersonic observing apparatus has a long-distance cable connected with the transducer and is to catch underwater information by transmitting and receiving supersonic waves from the transducer submerged in the water. The experiment as to this apparatus was done and the methods of it are as follows : (1) The method in midwater trawling By the operation of an indicator equipped in the ship, fitting the transducer to the head of a midwater trawling net through a long-distance cabtyre cable and transmitting and receiving the supersonic waves by the transducer, thus it measures the depth of the net, the height of net opening, the entering status of fish group into the net, etc. remotely from the ship. (2) The method in set net This method is to catch the status of fish group in the set net remotely from the land office by fitting the transducer to the buoy in the set net and then operating an indicator at the land office being connected with a long-distance cable. (3) The method of dropping down transducer This method is to observe the status of fish group, fry group, planktons, other living things, etc. by transmitting and receiving the supersonic waves in vertical or horizontal direction, positioning the transducer at each optional depth after dropping down it being connected with cable into the water. Further, it has been confirmed by the above experiment that a "Pre-Osc. Amp." is required in order to compensate the attenuation, which is increased by the cable for the supersonic observing apparatus when such cable used in especially long length and which influences clearly and interferes with their signal transmission.

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