Blar i ICES CM documents authored by IMR scientists (1949-2011) på emneord "VDP::Mathematics and natural science: 400::Physics: 430::Electromagnetism, acoustics, optics: 434"

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    • Dependence of equivalent beam angle on sound speed 

      Foote, Kenneth G. (ICES CM documents, Working paper, 1987)
      The equivalent beam angle is computed numericaily, according to its rigorous definition, for each of two transducers. These are those used with the SIMRAD split-beam echo sounders at 38 and 70 kHz. The results are expressed ...

    • Equivalent beam angles for several standard transducers 

      Foote, Kenneth G. (ICES CM documents, Working paper, 1990)
      Nominal values for the equivalent beam angle are given for several transducers. These are the standard split-beam transducers designed for the SIMRAD EK500 scientific echo sounder, with operating frequencies of 38 and 120 ...

    • Scheme for displaying fish position data in real time 

      Foote, Kenneth G. (ICES CM documents, Working paper, 1987)
      Fish reaction to the passage of acoustic surveying vessels may be at least partly assessed through use of the angle data derived with the SIMRAD split-beam echo sounder. Several schemes are outlined for displaying and ...

    • SONATE - Sonar effects on marine life - aiding naval officers in planning safe operation of active sonar 

      Henriksen, Jonas F.; Nordlund, Nina (ICES CM documents, Conference object, 2006)

    • Target strength of polarized fish 

      Foote, Kenneth G. (ICES CM documents, Working paper, 1987)
      The effect of behaviour on target strength is simulated through computation of the average target strength with respect to a range of normal orientation distributions. The mean tilt angle is varied from -30 to 30 deg for ...

    • Target strength of tiny roach 

      Foote, Kenneth G.; Lindem, Torfinn; Brabrand, Åge (ICES CM documents, Working paper, 1987)
      Seven frozen specimens of surface-adapted roach (Rutilus rutilus), of lengths 32-40 mm and masses 0.20-0.49 g, have been sectioned with a precision microtome. The swimbladder contours have been digitized and the swimbladder ...

    • The significance of fish behaviour in the evaluation of hydroacoustic survey data 

      Olsen, Kjell (ICES CM Documents;1981/B:22, Working paper, 1981)