Blar i Fisken og havet (1958- ) på emneord "ekkolodd"

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    • En korreksjon til ekkoloddets dybdeangivelse 

      Midttun, Lars (Fisken og havet;1964 - Nr. 3, Research report, 1964)
      An echo sounder is adjusted for constant sound velocity, usually 1500 m/sec. Since the velocity of sound in the sea is varying with temperature, salinity and depth, a correction is necessary if accurate soundings are ...

    • Power-budget and echo-integrator equations for fish abundance estimation 

      Lunde, Per; Pedersen, Audun O.; Korneliussen, Rolf J.; Tichy, Frank E.; Nes, Håvard (Fisken og Havet;10-2013, Research report, 2013-12-31)
      For abundance estimation and species identification on fisheries acoustic surveys, control with temperature and finite amplitude effects in the sea demands the calibration factor C of the conventional echo-integrator ...

    • Rapport om tokt med F/F "Johan Hjort" til Vest Grønland i april/mai 1964 

      Bratberg, Erling; Nakken, Odd (Fisken og havet;1964 - Nr. 7, Journal article, 1964)

    • Some methods for the generation of combined-frequency echograms 

      Korneliussen, Rolf J. (Fisken og havet, Research report, 2002)
      Calibrated and digitised data from two or more discrete echo sounder frequencies can be combined for the purpose of separating and extracting the acoustic scattering from zooplankton and fish in mixed recordings. Methods ...

    • Sonar kurs for fiskere 

      Vestnes, Gudmund (Fisken og havet;1964 - Nr. 2, Journal article, 1964)