섹션 개요

  •  Sound waves are often used for remote sensing and data transmission underwater. This is because sound waves propagate much farther than electromagnetic waves (light, radio waves, etc.), which are absorbed and attenuated underwater. The technology to detect sound signals emitted from a ship and bounced back to measure the distance to a distant object is called sonar (SONAR: SOund and NAvigation Ranging) and is indispensable for safe navigation. Sonic exploration technology, which began to develop after the sinking of the Titanic in 1912, is now used not only for depth measurement (distance from the water surface to the seafloor), but also for many underwater acoustic techniques such as fish detection and current velocity measurement, and is used as a means of quickly and extensively monitoring the state of the ocean.


    →Method of Ocean Observation (5) Acoustic Measurement

     



    マルチナロービーム音響測深器による海底地形探査　Seafloor Topographic Survey with Multi-Narrow Beam Acoustic Bathymetry
    計量魚群探知機のエコーグラム　Echogram of a metering fish finder