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Detalle de Documento

  • The "Pinger" as an Aid in Deep Trawling

    Publicado: Copenhague [s.l.] 1966

    Autor(es): H. Backus

    Ubicación: Centro de Documentación INVEMAR

    Solicítelo como: EE-33702

    Palabras clave: Métodos y equipos, Pesca de arrastre, Emisor de ultrasonidos

A battery-powered sound-source (the "pinger"), which emits precisely-timed pulses, can be attached to underwater apparatus. Comparison of pulses received directly from the pinger with their bottom reflections gives the height of the gear above bottom. Th application described here is the first in the which the gear is towed well astern of the ship.