Now showing items 1-2 of 2

    • A digital depth recorder 

      Johansen, Arne (NATO. SACLANTCEN, 1966/11)
      The depth recorder described has been designed for the direct computer processing of data, which it provides in digital form on perforated tape. It is intended as a supplement to the Precision Depth Recorder installed on ...
    • An acoustic, high resolution, sediment profiler 

      Johansen, Arne (NATO. SACLANTCEN, 1966/11)
      An acoustic sediment profiler is described that utilizes short 50 kHz pulses to achieve a high range resolution. In trials in shallow water, penetration depths of about 9 m and resolution of about 25 cm were obtained. ...