2001
- New Deep Water LF BroadBand Transducers Developed
for GeoAcoustics.
Neptune
awarded development of the new Low Frequency BroadBand
Transducers for GeoAcoustics Deep Tow 2000 System.
“Article
appeared in the July/August 2001 edition of International
Ocean Systems!”
Towards the perfect profiler?
The new GeoChirp II transmitter contains a better than 95 per cent efficient
linear power amplifier which can deliver better than 2.5kW rms, or better 5kW
peak power into the acoustic transducers. It can do this at a repetition rate
of four pulses per second for 32ms pulses on the end of 6000m of standard 11mm
coaxial cable, with all other systems running at full repetition rate. As with
the original GeoChirp system, the amplitude, frequency and phase of the transmitted
sweep waveform can be precisely controlled. However, the new amplifier combined
with newly designed deep rated wideband acoustic transducers (developed in
conjunction with Neptune Sonar Ltd) allows a single GeoChirp II pulse to put
more energy into the water than a single boomer shot while offering even greater
resolution than the original GeoChirp system. At present no other system can
approach this performance, regardless of cable length. Results are described
as "excellent" even in difficult coarse sands.
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