Hull mounted, protruding transducer for improving echo integration in bad weather
Working paper
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http://hdl.handle.net/11250/100289Utgivelsesdato
1990Metadata
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Sammendrag
A 38 kHz split beam survey transducer has been mounted on the tip
of a 4 m vertical protrusile stabilizing keel of the United States
NOAA fishery research vessel R/V Miller Freeman. Air blocking
problems, generally observable on all hull mounted transducers,
were reduced substantially, and excellent acoustic conditions were
achieved with the new mounting for wind speeds up to 35 knots (19
m/s). The improvements are demonstrated through comparative,
sequential echo integration of the air close to the transducer with
the keel in retracted and extended positions, and through echo
recordings on fish. Empirical functions for residual air bubble
corrections of echo integration data will presumably work well up
to wind speeds where target identification by trawl is problematic
because of safety.
Serie
ICES CM documents1990/B:31